CVE-2026-89539 (GCVE-0-2026-89539)
Vulnerability from cvelistv5 – Published: 2026-09-11 19:44 – Updated: 2026-10-30 12:32
VLAI
EPSS
VEX
Title
SUNRPC: reject duplicate CREDS_VALUE options
Summary
In the Linux kernel, the following vulnerability has been resolved:
SUNRPC: reject duplicate CREDS_VALUE options
gssx_dec_option_array() walks the wire-supplied option array and, for
every entry whose name matches CREDS_VALUE, calls
gssx_dec_linux_creds() on the same struct svc_cred. That helper
unconditionally installs a fresh groups_alloc() result into
creds->cr_group_info without releasing whatever pointer was already
there:
for (i = 0; i < count; i++) {
... decode name ...
if (length == sizeof(CREDS_VALUE) &&
memcmp(p, CREDS_VALUE, sizeof(CREDS_VALUE)) == 0) {
err = gssx_dec_linux_creds(xdr, creds);
...
}
}
A reply that carries two CREDS_VALUE entries therefore overwrites
cr_group_info on the second iteration and orphans the group_info
allocated by the first call. The earlier free_creds path only
releases the last cr_group_info via free_svc_cred(), so the first
allocation's refcount stays at one and its kvmalloc-backed storage
is leaked. No in-tree caller of gssp_accept_sec_context_upcall()
expects more than one CREDS_VALUE per reply.
Fix by tracking whether a CREDS_VALUE option has already been
decoded and returning -EINVAL on any subsequent match, so the
free_creds path releases the single group_info that was installed.
Severity
No CVSS data available.
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
1d658336b05f8697d6445834f8867f8ad5e4f735 , < 6207d7df96b3a7f507f0bfc8842b3760ee2fb1f8
(git)
Affected: 1d658336b05f8697d6445834f8867f8ad5e4f735 , < 4904d61eb2e2bd484000725fd302b8f37b4fcf3a (git) Affected: 1d658336b05f8697d6445834f8867f8ad5e4f735 , < 64b9ef369a6f723294613cb129e5f62c35429df5 (git) Affected: 1d658336b05f8697d6445834f8867f8ad5e4f735 , < 4b5ebb4f91a6152a0f7b1253f701197e5710d4da (git) Affected: 1d658336b05f8697d6445834f8867f8ad5e4f735 , < f615b884310bf82d0014e3b5a92eb9aa88146685 (git) Affected: 1d658336b05f8697d6445834f8867f8ad5e4f735 , < 7a1d0501cbb962beba23377035d667bf3c1726ee (git) Affected: 1d658336b05f8697d6445834f8867f8ad5e4f735 , < 9d94f046b23de0f77849ea69133063c949297e30 (git) Affected: 1d658336b05f8697d6445834f8867f8ad5e4f735 , < 2e4ce62385c1b8a887c5370af058ac7b52a8eaf9 (git) |
guessed | |
| Linux | Linux |
Affected:
3.10
Unaffected: 0 , < 3.10 (semver) Unaffected: 5.10.273 , ≤ 5.10.* (semver) Unaffected: 5.15.224 , ≤ 5.15.* (semver) Unaffected: 6.1.191 , ≤ 6.1.* (semver) Unaffected: 6.6.160 , ≤ 6.6.* (semver) Unaffected: 6.12.109 , ≤ 6.12.* (semver) Unaffected: 6.18.50 , ≤ 6.18.* (semver) Unaffected: 7.2.4 , ≤ 7.2.* (semver) Unaffected: 7.3 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
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"product": "Linux",
"programFiles": [
"net/sunrpc/auth_gss/gss_rpc_xdr.c"
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"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "3.10"
},
{
"lessThan": "3.10",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.273",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.224",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.191",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.109",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.50",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"version": "7.2.4",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.273",
"versionStartIncluding": "3.10",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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{
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},
{
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},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2.4",
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},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.3",
"versionStartIncluding": "3.10",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nSUNRPC: reject duplicate CREDS_VALUE options\n\ngssx_dec_option_array() walks the wire-supplied option array and, for\nevery entry whose name matches CREDS_VALUE, calls\ngssx_dec_linux_creds() on the same struct svc_cred. That helper\nunconditionally installs a fresh groups_alloc() result into\ncreds-\u003ecr_group_info without releasing whatever pointer was already\nthere:\n\n for (i = 0; i \u003c count; i++) {\n ... decode name ...\n if (length == sizeof(CREDS_VALUE) \u0026\u0026\n memcmp(p, CREDS_VALUE, sizeof(CREDS_VALUE)) == 0) {\n err = gssx_dec_linux_creds(xdr, creds);\n ...\n }\n }\n\nA reply that carries two CREDS_VALUE entries therefore overwrites\ncr_group_info on the second iteration and orphans the group_info\nallocated by the first call. The earlier free_creds path only\nreleases the last cr_group_info via free_svc_cred(), so the first\nallocation\u0027s refcount stays at one and its kvmalloc-backed storage\nis leaked. No in-tree caller of gssp_accept_sec_context_upcall()\nexpects more than one CREDS_VALUE per reply.\n\nFix by tracking whether a CREDS_VALUE option has already been\ndecoded and returning -EINVAL on any subsequent match, so the\nfree_creds path releases the single group_info that was installed."
}
],
"providerMetadata": {
"dateUpdated": "2026-10-30T12:32:05.658Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/6207d7df96b3a7f507f0bfc8842b3760ee2fb1f8"
},
{
"url": "https://git.kernel.org/stable/c/4904d61eb2e2bd484000725fd302b8f37b4fcf3a"
},
{
"url": "https://git.kernel.org/stable/c/64b9ef369a6f723294613cb129e5f62c35429df5"
},
{
"url": "https://git.kernel.org/stable/c/4b5ebb4f91a6152a0f7b1253f701197e5710d4da"
},
{
"url": "https://git.kernel.org/stable/c/f615b884310bf82d0014e3b5a92eb9aa88146685"
},
{
"url": "https://git.kernel.org/stable/c/7a1d0501cbb962beba23377035d667bf3c1726ee"
},
{
"url": "https://git.kernel.org/stable/c/9d94f046b23de0f77849ea69133063c949297e30"
},
{
"url": "https://git.kernel.org/stable/c/2e4ce62385c1b8a887c5370af058ac7b52a8eaf9"
}
],
"title": "SUNRPC: reject duplicate CREDS_VALUE options",
"x_generator": {
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}
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"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-89539",
"datePublished": "2026-09-11T19:44:16.699Z",
"dateReserved": "2026-09-11T19:38:34.721Z",
"dateUpdated": "2026-10-30T12:32:05.658Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-89539",
"date": "2026-11-02",
"epss": "0.00177",
"percentile": "0.07287"
},
"microsoft_vex": {
"current_release_date": "2026-11-01T14:48:47.000Z",
"cve": "CVE-2026-89539",
"id": "msrc_CVE-2026-89539",
"initial_release_date": "2026-09-13T01:14:37.000Z",
"product_status:known_affected": "4",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "SUNRPC: reject duplicate CREDS_VALUE options",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-89539.json",
"version": "5"
},
"nvd": {
"cve": {
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"affectedData": [
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"defaultStatus": "unaffected",
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"vendor": "Linux",
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"versionType": "git"
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],
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"vendor": "Linux",
"versions": [
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"version": "3.10"
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{
"lessThan": "3.10",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "5.10.273",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
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},
{
"lessThanOrEqual": "6.1.*",
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"version": "6.1.191",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
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"version": "6.6.160",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.12.109",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.50",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"version": "7.2.4",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nSUNRPC: reject duplicate CREDS_VALUE options\n\ngssx_dec_option_array() walks the wire-supplied option array and, for\nevery entry whose name matches CREDS_VALUE, calls\ngssx_dec_linux_creds() on the same struct svc_cred. That helper\nunconditionally installs a fresh groups_alloc() result into\ncreds-\u003ecr_group_info without releasing whatever pointer was already\nthere:\n\n for (i = 0; i \u003c count; i++) {\n ... decode name ...\n if (length == sizeof(CREDS_VALUE) \u0026\u0026\n memcmp(p, CREDS_VALUE, sizeof(CREDS_VALUE)) == 0) {\n err = gssx_dec_linux_creds(xdr, creds);\n ...\n }\n }\n\nA reply that carries two CREDS_VALUE entries therefore overwrites\ncr_group_info on the second iteration and orphans the group_info\nallocated by the first call. The earlier free_creds path only\nreleases the last cr_group_info via free_svc_cred(), so the first\nallocation\u0027s refcount stays at one and its kvmalloc-backed storage\nis leaked. No in-tree caller of gssp_accept_sec_context_upcall()\nexpects more than one CREDS_VALUE per reply.\n\nFix by tracking whether a CREDS_VALUE option has already been\ndecoded and returning -EINVAL on any subsequent match, so the\nfree_creds path releases the single group_info that was installed."
}
],
"id": "CVE-2026-89539",
"lastModified": "2026-10-30T13:20:20.120",
"metrics": {},
"published": "2026-09-11T20:19:36.977",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/2e4ce62385c1b8a887c5370af058ac7b52a8eaf9"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/4904d61eb2e2bd484000725fd302b8f37b4fcf3a"
},
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"url": "https://git.kernel.org/stable/c/4b5ebb4f91a6152a0f7b1253f701197e5710d4da"
},
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"url": "https://git.kernel.org/stable/c/6207d7df96b3a7f507f0bfc8842b3760ee2fb1f8"
},
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},
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"url": "https://git.kernel.org/stable/c/7a1d0501cbb962beba23377035d667bf3c1726ee"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/9d94f046b23de0f77849ea69133063c949297e30"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/f615b884310bf82d0014e3b5a92eb9aa88146685"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
},
"redhat_vex": {
"aggregate_severity": "Low",
"current_release_date": "2026-09-29T14:20:35+00:00",
"cve": "CVE-2026-89539",
"id": "CVE-2026-89539",
"initial_release_date": "2026-09-11T00:00:00+00:00",
"product_status:known_affected": "262",
"product_status:known_not_affected": "14",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: SUNRPC: reject duplicate CREDS_VALUE options",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89539.json",
"version": "3"
}
}
}
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.