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CERTFR-2026-AVI-0981
Vulnerability from certfr_avis - Published: 2026-08-07 - Updated: 2026-08-07
De multiples vulnérabilités ont été découvertes dans le noyau Linux de Debian. Elles permettent à un attaquant de provoquer une élévation de privilèges, une atteinte à l'intégrité des données et un déni de service.
Solutions
Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).
Impacted products
References
| Title | Publication Time | Tags | |||
|---|---|---|---|---|---|
|
|||||
{
"$ref": "https://www.cert.ssi.gouv.fr/openapi.json",
"affected_systems": [
{
"description": "Debian trixie versions ant\u00e9rieures \u00e0 6.12.100-1",
"product": {
"name": "Debian",
"vendor": {
"name": "Debian",
"scada": false
}
}
}
],
"affected_systems_content": "",
"content": "## Solutions\n\nSe r\u00e9f\u00e9rer au bulletin de s\u00e9curit\u00e9 de l\u0027\u00e9diteur pour l\u0027obtention des correctifs (cf. section Documentation).",
"cves": [
{
"name": "CVE-2026-64552",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64552"
},
{
"name": "CVE-2026-64287",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64287"
},
{
"name": "CVE-2026-64538",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64538"
},
{
"name": "CVE-2026-64192",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64192"
},
{
"name": "CVE-2026-64461",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64461"
},
{
"name": "CVE-2026-64542",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64542"
},
{
"name": "CVE-2026-64413",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64413"
},
{
"name": "CVE-2026-64510",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64510"
},
{
"name": "CVE-2026-64405",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64405"
},
{
"name": "CVE-2026-64531",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64531"
},
{
"name": "CVE-2026-53260",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-53260"
},
{
"name": "CVE-2026-53365",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-53365"
},
{
"name": "CVE-2026-64550",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64550"
},
{
"name": "CVE-2026-64557",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64557"
},
{
"name": "CVE-2026-64508",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64508"
},
{
"name": "CVE-2026-64438",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64438"
},
{
"name": "CVE-2026-64462",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64462"
},
{
"name": "CVE-2026-64421",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64421"
},
{
"name": "CVE-2026-64341",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64341"
},
{
"name": "CVE-2026-64534",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64534"
},
{
"name": "CVE-2026-64364",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64364"
},
{
"name": "CVE-2026-64553",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64553"
},
{
"name": "CVE-2026-64363",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64363"
},
{
"name": "CVE-2026-64375",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64375"
},
{
"name": "CVE-2026-64546",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64546"
},
{
"name": "CVE-2026-64488",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64488"
},
{
"name": "CVE-2026-64371",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64371"
},
{
"name": "CVE-2026-64539",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64539"
},
{
"name": "CVE-2026-64551",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64551"
},
{
"name": "CVE-2026-64554",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64554"
},
{
"name": "CVE-2026-64401",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64401"
},
{
"name": "CVE-2026-64533",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64533"
},
{
"name": "CVE-2026-64541",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64541"
},
{
"name": "CVE-2026-64549",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64549"
},
{
"name": "CVE-2026-63970",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-63970"
},
{
"name": "CVE-2026-64559",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64559"
},
{
"name": "CVE-2026-64544",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64544"
},
{
"name": "CVE-2026-64352",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64352"
},
{
"name": "CVE-2026-64555",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64555"
},
{
"name": "CVE-2026-64472",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64472"
},
{
"name": "CVE-2026-64509",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64509"
},
{
"name": "CVE-2026-64307",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64307"
},
{
"name": "CVE-2026-64545",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64545"
},
{
"name": "CVE-2026-64227",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64227"
},
{
"name": "CVE-2026-64481",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64481"
},
{
"name": "CVE-2026-53005",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-53005"
},
{
"name": "CVE-2026-64540",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64540"
},
{
"name": "CVE-2026-64434",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64434"
},
{
"name": "CVE-2026-64558",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64558"
},
{
"name": "CVE-2026-45944",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-45944"
},
{
"name": "CVE-2026-64286",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64286"
},
{
"name": "CVE-2026-64537",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64537"
},
{
"name": "CVE-2026-64361",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64361"
},
{
"name": "CVE-2026-64369",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64369"
},
{
"name": "CVE-2026-64547",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64547"
},
{
"name": "CVE-2026-64543",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64543"
},
{
"name": "CVE-2026-64206",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64206"
},
{
"name": "CVE-2026-64530",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64530"
},
{
"name": "CVE-2026-64560",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64560"
},
{
"name": "CVE-2026-64493",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64493"
},
{
"name": "CVE-2026-64535",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64535"
},
{
"name": "CVE-2026-64416",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64416"
},
{
"name": "CVE-2026-64548",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64548"
},
{
"name": "CVE-2026-64532",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64532"
},
{
"name": "CVE-2026-64428",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64428"
},
{
"name": "CVE-2026-64507",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64507"
},
{
"name": "CVE-2026-64390",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64390"
},
{
"name": "CVE-2026-64441",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64441"
}
],
"initial_release_date": "2026-08-07T00:00:00",
"last_revision_date": "2026-08-07T00:00:00",
"links": [],
"reference": "CERTFR-2026-AVI-0981",
"revisions": [
{
"description": "Version initiale",
"revision_date": "2026-08-07T00:00:00.000000"
}
],
"risks": [
{
"description": "Atteinte \u00e0 l\u0027int\u00e9grit\u00e9 des donn\u00e9es"
},
{
"description": "D\u00e9ni de service"
},
{
"description": "\u00c9l\u00e9vation de privil\u00e8ges"
}
],
"summary": "De multiples vuln\u00e9rabilit\u00e9s ont \u00e9t\u00e9 d\u00e9couvertes dans le noyau Linux de Debian. Elles permettent \u00e0 un attaquant de provoquer une \u00e9l\u00e9vation de privil\u00e8ges, une atteinte \u00e0 l\u0027int\u00e9grit\u00e9 des donn\u00e9es et un d\u00e9ni de service.",
"title": "Multiples vuln\u00e9rabilit\u00e9s dans le noyau Linux de Debian",
"vendor_advisories": [
{
"published_at": "2026-07-31",
"title": "Bulletin de s\u00e9curit\u00e9 Debian msg00316",
"url": "https://lists.debian.org/debian-security-announce/2026/msg00316.html"
}
]
}
CVE-2026-64531 (GCVE-0-2026-64531)
Vulnerability from cvelistv5 – Published: 2026-07-27 06:32 – Updated: 2026-08-05 12:42
VLAI
EPSS
VEX
Title
net: openvswitch: reject oversized nested action attrs
Summary
In the Linux kernel, the following vulnerability has been resolved:
net: openvswitch: reject oversized nested action attrs
Open vSwitch stores generated flow actions as nlattrs, whose nla_len
field is u16. Commit a1e64addf3ff ("net: openvswitch: remove
misbehaving actions length check") allowed the total sw_flow_actions
stream to grow beyond 64 KiB, which is valid, but also removed the last
guard preventing a generated nested action attribute from exceeding
U16_MAX.
An oversized generated container can thus be closed with a truncated
nla_len. A later dump or teardown then walks a structurally different
stream than the one that was validated. In particular, an oversized
nested CLONE/CT action may cause subsequent bytes in the generated
stream to be interpreted as independent actions.
Keep the larger total-action-stream behavior, but make nested action
close reject generated containers that do not fit in nla_len, and return
the error through all callers. For recursive SAMPLE, CLONE, DEC_TTL, and
CHECK_PKT_LEN builders, trim resource-owning action-list tails in reverse
construction order before discarding failed wrappers, so resources copied
into the rejected tails are released before the wrappers are removed.
Most failed outer wrappers are discarded by truncating actions_len after
child resources have been released. CHECK_PKT_LEN also trims its parent
after branch resources are gone. SET/TUNNEL close failures unwind their
known tun_dst ownership directly, and SET_TO_MASKED has no external
ownership and truncates on close failure.
Severity
7.8 (High)
Assigner
References
11 references
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
057dbc5b72e9fcac439cd561c3a539b8a0edeb92 , < ab855641241387db062a5e41d9ad6b8561542572
(git)
Affected: 2532adbfe917c0e71dba2650ffc6efe396314c87 , < c66bd2626c2764f23764ff0f8277f44a9cfe8349 (git) Affected: 4b1a0ee6164c7204c68ab5a9c48c07bfe8852485 , < d573250d228401f707f4dbc09d11227a6215ee5f (git) Affected: e6610f9c08b4c04cf7949c10fc246c071d00e935 , < f1efff8858403191361a01269c6fe8dd7f55a385 (git) Affected: a1e64addf3ff9257b45b78bc7d743781c3f41340 , < dbd14f736be02cfe73049bd801af89becd1a0749 (git) Affected: a1e64addf3ff9257b45b78bc7d743781c3f41340 , < 1b41cbe05b184f8861712f0806cc0c4f5d8c6dfe (git) Affected: a1e64addf3ff9257b45b78bc7d743781c3f41340 , < 3f1f755366687d051174739fb99f7d560202f60b (git) Affected: 6b099d285d7ed324494b6d684f377aa103856118 (git) Affected: 5.15.180 , < 5.15.212 (semver) Affected: 6.1.132 , < 6.1.178 (semver) Affected: 6.6.84 , < 6.6.145 (semver) Affected: 6.12.20 , < 6.12.97 (semver) Affected: 6.13.8 , < 6.14 (semver) |
|
| Linux | Linux |
Affected:
6.14
Unaffected: 0 , < 6.14 (semver) Unaffected: 5.15.212 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.40 , ≤ 6.18.* (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2-rc4 , ≤ * (original_commit_for_fix) |
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: openvswitch: reject oversized nested action attrs\n\nOpen vSwitch stores generated flow actions as nlattrs, whose nla_len\nfield is u16. Commit a1e64addf3ff (\"net: openvswitch: remove\nmisbehaving actions length check\") allowed the total sw_flow_actions\nstream to grow beyond 64 KiB, which is valid, but also removed the last\nguard preventing a generated nested action attribute from exceeding\nU16_MAX.\n\nAn oversized generated container can thus be closed with a truncated\nnla_len. A later dump or teardown then walks a structurally different\nstream than the one that was validated. In particular, an oversized\nnested CLONE/CT action may cause subsequent bytes in the generated\nstream to be interpreted as independent actions.\n\nKeep the larger total-action-stream behavior, but make nested action\nclose reject generated containers that do not fit in nla_len, and return\nthe error through all callers. For recursive SAMPLE, CLONE, DEC_TTL, and\nCHECK_PKT_LEN builders, trim resource-owning action-list tails in reverse\nconstruction order before discarding failed wrappers, so resources copied\ninto the rejected tails are released before the wrappers are removed.\n\nMost failed outer wrappers are discarded by truncating actions_len after\nchild resources have been released. CHECK_PKT_LEN also trims its parent\nafter branch resources are gone. SET/TUNNEL close failures unwind their\nknown tun_dst ownership directly, and SET_TO_MASKED has no external\nownership and truncates on close failure."
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CVE-2026-64532 (GCVE-0-2026-64532)
Vulnerability from cvelistv5 – Published: 2026-07-27 06:32 – Updated: 2026-08-05 12:42
VLAI
EPSS
VEX
Title
fs/ntfs3: bound NTFS_DE view.data_off in UpdateRecordData{Root,Allocation}
Summary
In the Linux kernel, the following vulnerability has been resolved:
fs/ntfs3: bound NTFS_DE view.data_off in UpdateRecordData{Root,Allocation}
In do_action()'s UpdateRecordDataRoot (fslog.c:3489) and
UpdateRecordDataAllocation (fslog.c:3697) cases, the memmove
destination is `Add2Ptr(e, le16_to_cpu(e->view.data_off))`,
where e->view.data_off comes from an on-disk NTFS_DE inside
an INDEX_ROOT or INDEX_BUFFER. Neither case validates
view.data_off + dlen against e->size; the existing
check_if_index_root / check_if_alloc_index helpers walk the
entry chain and validate the entry's offset, but not its
internal view fields.
The neighbouring read sites (e.g., fs/ntfs3/index.c when
iterating view entries) check view.data_off + view.data_size
<= e->size. Apply the same bound at the two memmove sites.
Reproduced under UML+KASAN on mainline 8d90b09e6741 via
pr_warn-only probe instrumentation: with view.data_off forced
to 0xFFFC, the memmove writes 32 bytes past the end of the
NTFS_DE.
This is similar in shape to Pavitra Jha's 2026-05-02 patch
"fs/ntfs3: prevent oob in case UpdateRecordDataRoot"
(<20260502105008.21827-1-jhapavitra98@gmail.com>) which
proposes calling ntfs3_bad_de_range(); that helper does not
exist in mainline. This patch uses inline checks.
Severity
7.8 (High)
Assigner
References
7 references
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
b46acd6a6a627d876898e1c84d3f84902264b445 , < b20e5a709d8bd190d6e4645606763c7423e694c1
(git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < d41b382068ca4e64e421f736cdd700095464b6ac (git) Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < 429d653ca641d38a78609b8f62e81a0a5c780a2d (git) Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < 315d3a9a48b49f889da3d858a9307e677cb9e1bd (git) Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < be306b8d9143a9c076c804a7ca025d69caf9c448 (git) Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < 36feda687afebae24c472202694448738809c411 (git) Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < 3e127829e57f5190f612412ece4541cb96d5ec7a (git) |
|
| Linux | Linux |
Affected:
5.15
Unaffected: 0 , < 5.15 (semver) Unaffected: 5.15.212 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.40 , ≤ 6.18.* (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix) |
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CVE-2026-64533 (GCVE-0-2026-64533)
Vulnerability from cvelistv5 – Published: 2026-07-27 06:32 – Updated: 2026-08-05 12:42
VLAI
EPSS
VEX
Title
fs/ntfs3: validate lcns_follow in log_replay conversion
Summary
In the Linux kernel, the following vulnerability has been resolved:
fs/ntfs3: validate lcns_follow in log_replay conversion
log_replay() converts DIR_PAGE_ENTRY_32 records into DIR_PAGE_ENTRY
records when replaying version 0 restart tables.
During this conversion, the memmove() length is derived directly from
the on-disk lcns_follow field:
memmove(&dp->vcn, &dp0->vcn_low,
2 * sizeof(u64) +
le32_to_cpu(dp->lcns_follow) * sizeof(u64));
check_rstbl() validates restart table structure, but does not constrain
per-entry lcns_follow values relative to the entry size. A malformed
filesystem image can provide an oversized lcns_follow value, causing
the conversion memmove() to access memory beyond the bounds of the
allocated restart table buffer.
The same field is later used to bound iteration over page_lcns[],
so validating lcns_follow during conversion also prevents downstream
out-of-bounds access from the same malformed metadata.
Compute the maximum valid lcns_follow from the already-validated
restart table entry size and reject entries that exceed this bound.
Reuse the existing t16/t32 scratch variables already declared in
log_replay() to avoid introducing new declarations.
[almaz.alexandrovich@paragon-software.com: fixed the conflicts]
Severity
7.8 (High)
Assigner
References
7 references
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
b46acd6a6a627d876898e1c84d3f84902264b445 , < ca343a99806b4fc8e27c48f08be3445c5fcd1445
(git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < ddfc8683e1a627dbf1b83bacf8961443dd654258 (git) Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < 57c071e2c4f30b9c6f5aacb6679aab1269fbae99 (git) Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < 159f694d682e4215b3822ae31ed3a4631628fe55 (git) Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < 7adb38279812c9c06b0e3fa7382f4d7887f3fa2d (git) Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < 32b9f8733feb241627fa5f564b1a99b5cae974c5 (git) Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < 6a4c53a2e26a865565bd6a460961e8d6fcb32329 (git) |
|
| Linux | Linux |
Affected:
5.15
Unaffected: 0 , < 5.15 (semver) Unaffected: 5.15.212 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.40 , ≤ 6.18.* (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix) |
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CVE-2026-64534 (GCVE-0-2026-64534)
Vulnerability from cvelistv5 – Published: 2026-07-27 06:32 – Updated: 2026-08-05 12:42
VLAI
EPSS
VEX
Title
nvmet-tcp: check INIT_FAILED before nvmet_req_uninit in digest error path
Summary
In the Linux kernel, the following vulnerability has been resolved:
nvmet-tcp: check INIT_FAILED before nvmet_req_uninit in digest error path
In nvmet_tcp_try_recv_ddgst(), when a data digest mismatch is detected,
nvmet_req_uninit() is called unconditionally. However, if the command
arrived via the nvmet_tcp_handle_req_failure() path, nvmet_req_init()
had returned false and percpu_ref_tryget_live() was never executed. The
unconditional percpu_ref_put() inside nvmet_req_uninit() then causes a
refcount underflow, leading to a WARNING in
percpu_ref_switch_to_atomic_rcu, a use-after-free diagnostic, and
eventually a permanent workqueue deadlock.
Check cmd->flags & NVMET_TCP_F_INIT_FAILED before calling
nvmet_req_uninit(), matching the existing pattern in
nvmet_tcp_execute_request().
Severity
9.8 (Critical)
Assigner
References
7 references
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
91edfca6f8b364d60cde3ddefaf7d03ddf35774b , < 22ec7a9fe9153d2737ee9b2fa6d2e43a1491decf
(git)
Affected: fda871c0ba5d2eed2cd1c881573168129da70058 , < ba35b1c674ca3841c0dfadd698f2c1b3ec542d4e (git) Affected: fda871c0ba5d2eed2cd1c881573168129da70058 , < c7874dad84b20433c0fe3919f291a762d40de08b (git) Affected: fda871c0ba5d2eed2cd1c881573168129da70058 , < e602c93b25bda4a9d0ff1791a4bdbfdcbb074af1 (git) Affected: fda871c0ba5d2eed2cd1c881573168129da70058 , < d306da8833e75f669d93424fd84940236f3850bc (git) Affected: fda871c0ba5d2eed2cd1c881573168129da70058 , < 2ed3c9d955e8cd6361f130623baa664a75fb345f (git) Affected: fda871c0ba5d2eed2cd1c881573168129da70058 , < 4606467a75cfc16721937272ed29462a750b60c8 (git) Affected: 4b17476d809273617d3317fa0d4ae78aa488d760 (git) Affected: 5.10.20 , < 5.10.261 (semver) Affected: 5.11.3 , < 5.12 (semver) |
|
| Linux | Linux |
Affected:
5.12
Unaffected: 0 , < 5.12 (semver) Unaffected: 5.10.261 , ≤ 5.10.* (semver) Unaffected: 5.15.212 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.40 , ≤ 6.18.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix) |
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CVE-2026-64535 (GCVE-0-2026-64535)
Vulnerability from cvelistv5 – Published: 2026-07-27 06:32 – Updated: 2026-08-05 12:42
VLAI
EPSS
VEX
Title
nvmet-tcp: Fix potential UAF when ddgst mismatch
Summary
In the Linux kernel, the following vulnerability has been resolved:
nvmet-tcp: Fix potential UAF when ddgst mismatch
Shivam Kumar found via vulnerability testing:
When data digest is enabled on an NVMe/TCP connection and a digest
mismatch occurs on a non-final H2C_DATA PDU during an R2T-based
data transfer, the digest error handler in nvmet_tcp_try_recv_ddgst()
calls nvmet_req_uninit() — which performs percpu_ref_put() on the
submission queue — but does NOT mark the command as completed. It
does not set cqe->status, does not modify rbytes_done, and does not
clear any flag. When the subsequent fatal error triggers queue
teardown, nvmet_tcp_uninit_data_in_cmds() iterates all commands,
checks nvmet_tcp_need_data_in() for each one, and finds that the
already-uninited command still appears to need data (because
rbytes_done < transfer_len and cqe->status == 0). It therefore calls
nvmet_req_uninit() a second time on the same command — a double
percpu_ref_put against a single percpu_ref_get.
Severity
9.8 (Critical)
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
fda871c0ba5d2eed2cd1c881573168129da70058 , < 96fe2513df590e74b04253a45089cae75569570e
(git)
Affected: fda871c0ba5d2eed2cd1c881573168129da70058 , < e091ff83d962f9ed00d9bd70443676de9fe98bdc (git) Affected: fda871c0ba5d2eed2cd1c881573168129da70058 , < 6f9442983a3e4227afd1c83a5251ddbca585ea21 (git) Affected: fda871c0ba5d2eed2cd1c881573168129da70058 , < 088ee46c18d99baef453afd74181dd40ade044ad (git) Affected: fda871c0ba5d2eed2cd1c881573168129da70058 , < dbbd07d0a7020b80f6a7028e561908f7b83b3d5a (git) Affected: 91edfca6f8b364d60cde3ddefaf7d03ddf35774b (git) Affected: 4b17476d809273617d3317fa0d4ae78aa488d760 (git) Affected: 5.10.20 , < 5.11 (semver) Affected: 5.11.3 , < 5.12 (semver) |
|
| Linux | Linux |
Affected:
5.12
Unaffected: 0 , < 5.12 (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.40 , ≤ 6.18.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix) |
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CVE-2026-64537 (GCVE-0-2026-64537)
Vulnerability from cvelistv5 – Published: 2026-07-27 20:10 – Updated: 2026-07-27 20:10
VLAI
EPSS
VEX
Title
bridge: cfm: reject invalid CCM interval at configuration time
Summary
In the Linux kernel, the following vulnerability has been resolved:
bridge: cfm: reject invalid CCM interval at configuration time
ccm_tx_work_expired() re-arms itself via queue_delayed_work() using
the configured exp_interval converted by interval_to_us(). When
exp_interval is BR_CFM_CCM_INTERVAL_NONE or out of range,
interval_to_us() returns 0, causing the worker to fire immediately in
a tight loop that allocates skbs until OOM.
Fix this by validating exp_interval at configuration time:
- Constrain IFLA_BRIDGE_CFM_CC_CONFIG_EXP_INTERVAL to the valid range
[BR_CFM_CCM_INTERVAL_3_3_MS, BR_CFM_CCM_INTERVAL_10_MIN] in the
netlink policy so userspace cannot set an invalid value.
- Reject starting CCM TX in br_cfm_cc_ccm_tx() when exp_interval has
not yet been configured (defaults to 0 from kzalloc).
Severity
No CVSS data available.
Assigner
References
7 references
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
2be665c3940d367e0a2a8128eb4985ce323f99a3 , < 2870056a78961e0fecd652362ee9d3fcfd24a8a6
(git)
Affected: 2be665c3940d367e0a2a8128eb4985ce323f99a3 , < f0f5eb59a97ece0d85de8cfa95dc18c609302a8b (git) Affected: 2be665c3940d367e0a2a8128eb4985ce323f99a3 , < 53788b134519e995699ea3721969c96a08d64575 (git) Affected: 2be665c3940d367e0a2a8128eb4985ce323f99a3 , < b42aeb58317f12024734759ff745856b53948873 (git) Affected: 2be665c3940d367e0a2a8128eb4985ce323f99a3 , < a090880c1f544589427e5b7050c40fb211ccecb4 (git) Affected: 2be665c3940d367e0a2a8128eb4985ce323f99a3 , < 865643640b5b5c4579b32d7a55ac9ad648362eaa (git) Affected: 2be665c3940d367e0a2a8128eb4985ce323f99a3 , < f3e02edd8322b31b8e6517faa6ba053bf29d1e26 (git) |
|
| Linux | Linux |
Affected:
5.11
Unaffected: 0 , < 5.11 (semver) Unaffected: 5.15.212 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.40 , ≤ 6.18.* (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix) |
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CVE-2026-64538 (GCVE-0-2026-64538)
Vulnerability from cvelistv5 – Published: 2026-07-27 20:10 – Updated: 2026-07-27 20:10
VLAI
EPSS
VEX
Title
ipv6: Fix null-ptr-deref in fib6_nh_mtu_change().
Summary
In the Linux kernel, the following vulnerability has been resolved:
ipv6: Fix null-ptr-deref in fib6_nh_mtu_change().
fib6_nh_mtu_change() re-fetches idev via __in6_dev_get(arg->dev) and
dereferences idev->cnf.mtu6 without a NULL check. addrconf_ifdown()
clears dev->ip6_ptr with RCU_INIT_POINTER() after rt6_disable_ip() has
released tb6_lock, so the RA-driven MTU walk can observe a NULL idev and
oops. The caller rt6_mtu_change_route() guards its own __in6_dev_get(),
but this re-fetch is unguarded; nexthop-backed routes survive
addrconf_ifdown()'s flush, so the walk still reaches it after ip6_ptr is
nulled.
Return 0 when idev is NULL, matching rt6_mtu_change_route() and the
fib6_mtu() fix in commit 5ad509c1fdad ("ipv6: Fix null-ptr-deref in
fib6_mtu().").
Oops: general protection fault, ... KASAN: null-ptr-deref in range
[0x00000000000002a8-0x00000000000002af]
RIP: 0010:fib6_nh_mtu_change+0x203/0x990
rt6_mtu_change_route+0x141/0x1d0
__fib6_clean_all+0xd0/0x160
rt6_mtu_change+0xb4/0x100
ndisc_router_discovery+0x24b5/0x2cb0
icmpv6_rcv+0x12e9/0x1710
ipv6_rcv+0x39b/0x410
Severity
No CVSS data available.
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
c0b220cf7d80eb8a36ae9f12cae6df4577a6814e , < d08d019f2f43a6f9a71e81868bbc326b3afaf37b
(git)
Affected: c0b220cf7d80eb8a36ae9f12cae6df4577a6814e , < 1451deca9896957159f0666520a792c1b861af4f (git) Affected: c0b220cf7d80eb8a36ae9f12cae6df4577a6814e , < b2c70dd3326809429b709a9c7e9220d29923051a (git) Affected: c0b220cf7d80eb8a36ae9f12cae6df4577a6814e , < 302d57ed7872838b40e56a868fb4c7da7da606e9 (git) Affected: c0b220cf7d80eb8a36ae9f12cae6df4577a6814e , < 80600b5d0f3ecb9324120dc95b5e915130f516c5 (git) Affected: c0b220cf7d80eb8a36ae9f12cae6df4577a6814e , < b0d0eb13a0441a8ebf4f227843deaf494f1e2c33 (git) Affected: c0b220cf7d80eb8a36ae9f12cae6df4577a6814e , < 6428634f7a0b7878144b4925c37856bef3224967 (git) Affected: c0b220cf7d80eb8a36ae9f12cae6df4577a6814e , < 46c3b8191aad3d032776bf3bebf03efdf5f4b905 (git) |
|
| Linux | Linux |
Affected:
5.3
Unaffected: 0 , < 5.3 (semver) Unaffected: 5.10.261 , ≤ 5.10.* (semver) Unaffected: 5.15.212 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.40 , ≤ 6.18.* (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix) |
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CVE-2026-64539 (GCVE-0-2026-64539)
Vulnerability from cvelistv5 – Published: 2026-07-27 20:10 – Updated: 2026-08-05 12:42
VLAI
EPSS
VEX
Title
Bluetooth: eir: Fix stack OOB write when prepending the Flags AD
Summary
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: eir: Fix stack OOB write when prepending the Flags AD
eir_create_adv_data() builds the advertising data into a fixed-size
buffer ("size", 31 for the legacy path). It may prepend a 3-byte "Flags"
AD structure (LE_AD_NO_BREDR on an LE-only controller) and then copies
the per-instance data without checking that it still fits:
memcpy(ptr, adv->adv_data, adv->adv_data_len);
tlv_data_max_len() only reserves those 3 bytes when the user-supplied
flags carry a managed-flags bit, so an instance added with flags == 0 is
accepted with adv_data_len up to the full buffer. At advertise time the
flags are still prepended, and the memcpy() writes 3 + adv_data_len
bytes into the size-byte buffer:
BUG: KASAN: stack-out-of-bounds in eir_create_adv_data (net/bluetooth/eir.c:301)
Write of size 31 at addr ffff88800a547bdc by task kworker/u9:0/65
Workqueue: hci0 hci_cmd_sync_work
__asan_memcpy (mm/kasan/shadow.c:106)
eir_create_adv_data (net/bluetooth/eir.c:301)
hci_update_adv_data_sync (net/bluetooth/hci_sync.c:1310)
hci_schedule_adv_instance_sync (net/bluetooth/hci_sync.c:1817)
hci_cmd_sync_work (net/bluetooth/hci_sync.c:332)
This frame has 1 object:
[32, 64) 'cp'
The "Flags" structure is added by the kernel, not requested by
userspace, so only prepend it when it fits together with the instance
advertising data; when there is no room for both, drop the flags rather
than the user-provided data.
Reachable by a local user with CAP_NET_ADMIN owning an LE-only
controller on the legacy advertising path.
Severity
7.8 (High)
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
b44133ff03be30b55f23036e62f403a3f7784fce , < 0f0b6232af56441d0a2dcb173cc4f8d8aab39014
(git)
Affected: b44133ff03be30b55f23036e62f403a3f7784fce , < 09301f1fdf2aef8cce34d0c4650c30e7edb1ced9 (git) Affected: b44133ff03be30b55f23036e62f403a3f7784fce , < f1b4df9c260c51726da2e86e19322825fddeefd0 (git) Affected: b44133ff03be30b55f23036e62f403a3f7784fce , < 57077eeb586c42f124bc09e018449362223067b3 (git) Affected: b44133ff03be30b55f23036e62f403a3f7784fce , < 6f5fb689fdf80bdd143f22a502f9eb1f3c85e286 (git) |
|
| Linux | Linux |
Affected:
4.1
Unaffected: 0 , < 4.1 (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.40 , ≤ 6.18.* (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix) |
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"value": "AV:L - The overflow is driven entirely by locally supplied advertising data written to an AF_BLUETOOTH HCI control socket (MGMT_OP_ADD_ADVERTISING / ADD_EXT_ADV_DATA / MESH_SEND); no remote or adjacent Bluetooth peer can influence the length or contents. Consistent with the same-class CVE-2026-53209 and CVE-2026-64126, this is a local-only trigger.\nAC:L - The attacker fully controls both preconditions \u2014 submit an instance with flags==0 and adv_data_len at the maximum, containing no EIR_FLAGS element \u2014 and the kernel then deterministically prepends the 3-byte Flags AD on any LE-only controller. No race, no memory-layout luck, no retry needed.\nPR:L - Reaching the mgmt handler requires HCI_SOCK_TRUSTED, granted by CAP_NET_ADMIN, which is a delegated capability routinely held by the Bluetooth stack daemon rather than full system root, and this CNA scores the identical CAP_NET_ADMIN-gated Bluetooth mgmt paths (CVE-2026-64126, CVE-2026-53209, CVE-2026-31511) as PR:L. Choosing the higher-severity option where the privilege boundary is arguable.\nUI:N - The attacker issues the mgmt commands itself and the overflow fires from hci_cmd_sync_work when the instance is scheduled for advertising. No victim action of any kind is involved.\nS:U - The corruption is confined to the kernel\u0027s own stack within the same security authority; there is no VM, IOMMU, or sandbox boundary crossed.\nC:H - On the extended-advertising path the inflated length (254 \u003e 251) makes struct_size() copy 3 bytes of adjacent kernel stack past the DEFINE_FLEX pdu into the HCI command skb, which is exposed via the HCI monitor channel and handed to the controller for broadcast, and the stack corruption is generally leverageable for further disclosure.\nI:H - This is an out-of-bounds write of fully attacker-controlled bytes (the tail of the user-supplied adv_data) past a local stack object, and it additionally leaves hdev-\u003eadv_data_len set to a value larger than the data actually stored. An attacker-controlled linear stack overflow is treated as high integrity impact.\nA:H - Overwriting bytes immediately past the stack object corrupts adjacent frame state and, with CONFIG_STACKPROTECTOR, will trip __stack_chk_fail leading to a kernel panic; the reported KASAN stack-out-of-bounds confirms real memory corruption in hci_cmd_sync_work."
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CVE-2026-64540 (GCVE-0-2026-64540)
Vulnerability from cvelistv5 – Published: 2026-07-27 20:10 – Updated: 2026-08-05 12:42
VLAI
EPSS
VEX
Title
usbnet: gl620a: fix out-of-bounds read in genelink_rx_fixup()
Summary
In the Linux kernel, the following vulnerability has been resolved:
usbnet: gl620a: fix out-of-bounds read in genelink_rx_fixup()
genelink_rx_fixup() splits an aggregated RX frame into its individual
packets, using a per-packet length taken from device-supplied data. That
length is only bounded by GL_MAX_PACKET_LEN (1514); it is never compared
against how many bytes were actually received.
A malicious GeneLink (GL620A) device can therefore send a short URB whose
header claims packet_count > 1 and a first packet of up to 1514 bytes.
skb_put_data(gl_skb, packet->packet_data, size);
then copies past the end of the receive buffer and hands the adjacent slab
contents up the network stack, an out-of-bounds read that leaks kernel heap.
No privilege is required: the path runs in the usbnet RX softirq as soon as
the interface is up.
BUG: KASAN: slab-out-of-bounds in genelink_rx_fixup (drivers/net/usb/gl620a.c:112)
Read of size 1514 at addr ffff888011309708 by task ksoftirqd/0/14
Call Trace:
...
__asan_memcpy (mm/kasan/shadow.c:105)
genelink_rx_fixup (include/linux/skbuff.h:2814 drivers/net/usb/gl620a.c:112)
usbnet_bh (drivers/net/usb/usbnet.c:572 drivers/net/usb/usbnet.c:1589)
process_one_work (kernel/workqueue.c:3322)
bh_worker (kernel/workqueue.c:3405)
tasklet_action (kernel/softirq.c:965)
handle_softirqs (kernel/softirq.c:622)
run_ksoftirqd (kernel/softirq.c:1076)
...
skb_pull() already verifies that the requested length fits the buffer and
returns NULL otherwise. Move it ahead of the copy and check its result, so
a packet that overruns the received data is rejected before it is read.
Well-formed frames, whose packets are fully present, are unaffected.
Severity
8.1 (High)
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
47ee3051c856cc2aa95d35d577a8cb37279d540f , < 255d03551f94c7bdd86c7d9181a70b21917d829f
(git)
Affected: 47ee3051c856cc2aa95d35d577a8cb37279d540f , < 4359376e6238d89977a35086e47ca3b07f43e850 (git) Affected: 47ee3051c856cc2aa95d35d577a8cb37279d540f , < 8624e179fa3ce23c2fbd1a198ce30764b73f054a (git) Affected: 47ee3051c856cc2aa95d35d577a8cb37279d540f , < 573418f7ea8f859a841417eb4b915594094fd967 (git) Affected: 47ee3051c856cc2aa95d35d577a8cb37279d540f , < 0575599e451aff3c5329922562374a2cab25fc51 (git) Affected: 47ee3051c856cc2aa95d35d577a8cb37279d540f , < 0a7d9c7c5f1f208c523abbb4db6aea7bc1fad3db (git) Affected: 47ee3051c856cc2aa95d35d577a8cb37279d540f , < 3ef79fa3860e644c8de7834fa7300e1c58f38862 (git) Affected: 47ee3051c856cc2aa95d35d577a8cb37279d540f , < 8ff7f2a6da4fccaa5cc9be7251a24e71e29fbd1a (git) |
|
| Linux | Linux |
Affected:
2.6.14
Unaffected: 0 , < 2.6.14 (semver) Unaffected: 5.10.261 , ≤ 5.10.* (semver) Unaffected: 5.15.212 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.40 , ≤ 6.18.* (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2-rc2 , ≤ * (original_commit_for_fix) |
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusbnet: gl620a: fix out-of-bounds read in genelink_rx_fixup()\n\ngenelink_rx_fixup() splits an aggregated RX frame into its individual\npackets, using a per-packet length taken from device-supplied data. That\nlength is only bounded by GL_MAX_PACKET_LEN (1514); it is never compared\nagainst how many bytes were actually received.\n\nA malicious GeneLink (GL620A) device can therefore send a short URB whose\nheader claims packet_count \u003e 1 and a first packet of up to 1514 bytes.\n\n\tskb_put_data(gl_skb, packet-\u003epacket_data, size);\n\nthen copies past the end of the receive buffer and hands the adjacent slab\ncontents up the network stack, an out-of-bounds read that leaks kernel heap.\nNo privilege is required: the path runs in the usbnet RX softirq as soon as\nthe interface is up.\n\n BUG: KASAN: slab-out-of-bounds in genelink_rx_fixup (drivers/net/usb/gl620a.c:112)\n Read of size 1514 at addr ffff888011309708 by task ksoftirqd/0/14\n Call Trace:\n ...\n __asan_memcpy (mm/kasan/shadow.c:105)\n genelink_rx_fixup (include/linux/skbuff.h:2814 drivers/net/usb/gl620a.c:112)\n usbnet_bh (drivers/net/usb/usbnet.c:572 drivers/net/usb/usbnet.c:1589)\n process_one_work (kernel/workqueue.c:3322)\n bh_worker (kernel/workqueue.c:3405)\n tasklet_action (kernel/softirq.c:965)\n handle_softirqs (kernel/softirq.c:622)\n run_ksoftirqd (kernel/softirq.c:1076)\n ...\n\nskb_pull() already verifies that the requested length fits the buffer and\nreturns NULL otherwise. Move it ahead of the copy and check its result, so\na packet that overruns the received data is rejected before it is read.\nWell-formed frames, whose packets are fully present, are unaffected."
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"value": "AV:A - The gl620a driver is a FLAG_POINTTOPOINT network interface, and the malformed aggregation header is received network data generated by the peer host on the other end of the GeneLink host-to-host cable, processed in the usbnet RX softirq. The attack is confined to that directly attached link segment, making it logically adjacent rather than routable or purely physical.\nAC:L - The attacker fully controls the frame contents and only needs to send an 18-byte URB declaring packet_count \u003e 1 with a first packet_length of up to 1514; the missing bounds check is deterministic with no race, memory-layout, or timing dependency.\nPR:N - No credentials or privileges on the target are required \u2014 the parse runs unconditionally in the RX softirq for any frame received once the interface is up, with no capability or authentication check anywhere on the usbnet_bh -\u003e rx_process -\u003e rx_fixup path.\nUI:N - No victim action is needed beyond the interface being in its normal operational state, which is inherent to a host-to-host link cable in use and is done automatically by NetworkManager/systemd-networkd.\nS:U - The over-read and the leaked memory stay within the kernel\u0027s own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Up to ~47 KB of adjacent kernel heap is read past the valid received data and delivered up the network stack as an Ethernet frame, exfiltrating arbitrary slab contents (prior packet data, keys, pointers) to the attacker and to any local packet capture \u2014 an unbounded, repeatable kernel memory disclosure.\nI:N - The defect is strictly a read; gl_skb is allocated with alloc_skb(size) before skb_put_data() copies exactly size bytes, so no kernel memory is written out of bounds or otherwise modified.\nA:H - With rx_urb_size reduced the read runs tens of kilobytes past a small slab object and can touch unmapped memory from softirq context, and on hardened kernels the KASAN slab-out-of-bounds report (as captured in the fix commit) panics the machine; the attacker can repeat it with every frame."
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"providerMetadata": {
"dateUpdated": "2026-08-05T12:42:48.500Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"title": "usbnet: gl620a: fix out-of-bounds read in genelink_rx_fixup()",
"x_generator": {
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"datePublished": "2026-07-27T20:10:33.905Z",
"dateReserved": "2026-07-19T15:36:31.795Z",
"dateUpdated": "2026-08-05T12:42:48.500Z",
"state": "PUBLISHED"
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CVE-2026-64541 (GCVE-0-2026-64541)
Vulnerability from cvelistv5 – Published: 2026-07-27 20:10 – Updated: 2026-08-05 12:42
VLAI
EPSS
VEX
Title
net/smc: fix UAF in smc_cdc_rx_handler() by pinning the socket
Summary
In the Linux kernel, the following vulnerability has been resolved:
net/smc: fix UAF in smc_cdc_rx_handler() by pinning the socket
smc_cdc_rx_handler() looks up the connection by token under the link
group's conns_lock, drops the lock, and then dereferences conn and the
smc_sock derived from it, ending in sock_hold(&smc->sk) inside
smc_cdc_msg_recv(). No reference is held across the lock release.
The only reference pinning the socket while the connection is
discoverable in the link group is taken in smc_lgr_register_conn()
(sock_hold) and dropped in __smc_lgr_unregister_conn() (sock_put), both
under conns_lock. Once the handler drops conns_lock, a concurrent
close() -> smc_release() -> smc_conn_free() -> smc_lgr_unregister_conn()
can drop that reference and free the smc_sock, so the handler's later
sock_hold() runs on freed memory:
WARNING: lib/refcount.c:25 at refcount_warn_saturate
Workqueue: rxe_wq do_work
refcount_warn_saturate (lib/refcount.c:25)
smc_cdc_msg_recv (net/smc/smc_cdc.c:430)
smc_cdc_rx_handler (net/smc/smc_cdc.c:502)
smc_wr_rx_tasklet_fn (net/smc/smc_wr.c:445)
tasklet_action_common (kernel/softirq.c:938)
handle_softirqs (kernel/softirq.c:622)
Kernel panic - not syncing: panic_on_warn set
Only SMC-R is affected. The SMC-D receive tasklet is stopped by
tasklet_kill(&conn->rx_tsklet) in smc_conn_free() before the connection
is unregistered, so it cannot run concurrently with the free.
Take the socket reference while still holding conns_lock, so the
registration reference can no longer be the last one, and drop it once
the handler is done.
Severity
9.8 (Critical)
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
d7b0e37c1ac152905b18a5b9506179091a35b0b6 , < 8de4f665d0febfb92803dece377791a563fc7041
(git)
Affected: d7b0e37c1ac152905b18a5b9506179091a35b0b6 , < 8145b432136285e01091815b48ceb2dae261f262 (git) Affected: d7b0e37c1ac152905b18a5b9506179091a35b0b6 , < 1951bffbc6493ec34cff3956b29d4bc6606904a6 (git) Affected: d7b0e37c1ac152905b18a5b9506179091a35b0b6 , < 647b19e5cc145a2f1f685ae8ff3805a17356888c (git) Affected: d7b0e37c1ac152905b18a5b9506179091a35b0b6 , < 472e9d7c0d5b03be3ff91ff941f57da822b031bc (git) Affected: d7b0e37c1ac152905b18a5b9506179091a35b0b6 , < 3bfb96d9bc6a7ed0b99c7db329cc2e22a28d84bb (git) Affected: d7b0e37c1ac152905b18a5b9506179091a35b0b6 , < ce5aa8084329351086894aa34d77e40301d5bd3d (git) Affected: d7b0e37c1ac152905b18a5b9506179091a35b0b6 , < 9d160b35cc34a2ba8229d07651468a7848325135 (git) |
|
| Linux | Linux |
Affected:
4.18
Unaffected: 0 , < 4.18 (semver) Unaffected: 5.10.261 , ≤ 5.10.* (semver) Unaffected: 5.15.212 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.40 , ≤ 6.18.* (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2-rc3 , ≤ * (original_commit_for_fix) |
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"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: fix UAF in smc_cdc_rx_handler() by pinning the socket\n\nsmc_cdc_rx_handler() looks up the connection by token under the link\ngroup\u0027s conns_lock, drops the lock, and then dereferences conn and the\nsmc_sock derived from it, ending in sock_hold(\u0026smc-\u003esk) inside\nsmc_cdc_msg_recv(). No reference is held across the lock release.\n\nThe only reference pinning the socket while the connection is\ndiscoverable in the link group is taken in smc_lgr_register_conn()\n(sock_hold) and dropped in __smc_lgr_unregister_conn() (sock_put), both\nunder conns_lock. Once the handler drops conns_lock, a concurrent\nclose() -\u003e smc_release() -\u003e smc_conn_free() -\u003e smc_lgr_unregister_conn()\ncan drop that reference and free the smc_sock, so the handler\u0027s later\nsock_hold() runs on freed memory:\n\n WARNING: lib/refcount.c:25 at refcount_warn_saturate\n Workqueue: rxe_wq do_work\n refcount_warn_saturate (lib/refcount.c:25)\n smc_cdc_msg_recv (net/smc/smc_cdc.c:430)\n smc_cdc_rx_handler (net/smc/smc_cdc.c:502)\n smc_wr_rx_tasklet_fn (net/smc/smc_wr.c:445)\n tasklet_action_common (kernel/softirq.c:938)\n handle_softirqs (kernel/softirq.c:622)\n Kernel panic - not syncing: panic_on_warn set\n\nOnly SMC-R is affected. The SMC-D receive tasklet is stopped by\ntasklet_kill(\u0026conn-\u003erx_tsklet) in smc_conn_free() before the connection\nis unregistered, so it cannot run concurrently with the free.\n\nTake the socket reference while still holding conns_lock, so the\nregistration reference can no longer be the last one, and drop it once\nthe handler is done."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 9.8,
"baseSeverity": "CRITICAL",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:N - The vulnerable handler is driven entirely by a CDC control message sent by the remote SMC-R peer over the RDMA link, with an attacker-chosen `token` field and no local syscall involvement. SMC-R runs over RoCEv2 (IP/UDP-routable, port 4791) with the CLC handshake over plain TCP, and SMC-Rv2 explicitly supports non-local/routed peers, so the attacker need not share an L2 segment.\nAC:L - The attacker controls both sides of the race: it chooses when to emit CDC messages and which connection to target (the alert token is disclosed to it in the CLC accept/confirm), and it can drive the teardown side itself via CDC close/abort flags into `smc_close_passive_work()` or a stale seqno with `failover_validation` into `abort_work` -\u003e `smc_conn_kill()`. The race can be retried indefinitely across many connections in the same link group, and was reproduced in practice with soft-RoCE.\nPR:N - Establishing an SMC-R connection to a listening SMC socket requires no credentials \u2014 SMC has no authentication layer of its own, exactly like plain TCP. Everything after connection establishment (sending CDC messages with a chosen token, signalling close/abort) is available to an unauthenticated peer.\nUI:N - The CDC message is processed in a softirq tasklet from the RDMA completion queue with no involvement from any local user or application action. No victim interaction of any kind is needed.\nS:U - The corruption is confined to kernel memory within the same security authority; there is no VM, IOMMU, or sandbox boundary crossed. This is a standard in-kernel use-after-free.\nC:H - The freed `smc_sock` is reused type-safely as another live socket, so attacker-supplied cursors applied by `smc_cdc_msg_recv_action()` break the `0 \u003c= bytes_to_rcv \u003c= rmb_desc-\u003elen` invariant and make `smc_rx_recvmsg()` hand stale RMB contents to userspace, while the urgent-data path reads `*(base + conn-\u003eurg_curs.count - 1)` at an attacker-chosen offset. Once the slab page is reclaimed after the RCU grace period, reuse is unconstrained, giving a general kernel-memory read primitive.\nI:H - `sock_hold()` on an already-zero refcount followed by `sock_put()` re-enters `sk_free()`, yielding a double free, and the handler additionally writes `sk_err`/`sk_shutdown`, makes indirect calls through `sk_data_ready()`/`sk_write_space()`, and `queue_work()`s a freed `work_struct`. These are classic heap-spray and control-flow-hijack primitives leading to arbitrary kernel write.\nA:H - The reported symptom is `refcount_warn_saturate` from `smc_cdc_msg_recv()`, which is an immediate kernel panic on `panic_on_warn` systems, and dereferencing freed memory in softirq context otherwise oopses. The attacker can trigger it repeatedly without authentication."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T12:42:49.565Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/8de4f665d0febfb92803dece377791a563fc7041"
},
{
"url": "https://git.kernel.org/stable/c/8145b432136285e01091815b48ceb2dae261f262"
},
{
"url": "https://git.kernel.org/stable/c/1951bffbc6493ec34cff3956b29d4bc6606904a6"
},
{
"url": "https://git.kernel.org/stable/c/647b19e5cc145a2f1f685ae8ff3805a17356888c"
},
{
"url": "https://git.kernel.org/stable/c/472e9d7c0d5b03be3ff91ff941f57da822b031bc"
},
{
"url": "https://git.kernel.org/stable/c/3bfb96d9bc6a7ed0b99c7db329cc2e22a28d84bb"
},
{
"url": "https://git.kernel.org/stable/c/ce5aa8084329351086894aa34d77e40301d5bd3d"
},
{
"url": "https://git.kernel.org/stable/c/9d160b35cc34a2ba8229d07651468a7848325135"
}
],
"title": "net/smc: fix UAF in smc_cdc_rx_handler() by pinning the socket",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-64541",
"datePublished": "2026-07-27T20:10:34.439Z",
"dateReserved": "2026-07-19T15:36:31.795Z",
"dateUpdated": "2026-08-05T12:42:49.565Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
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Nomenclature
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