CVE-2026-52943 (GCVE-0-2026-52943)
Vulnerability from cvelistv5 – Published: 2026-06-24 09:00 – Updated: 2026-06-30 12:09
VLAI
Title
net: skbuff: fix missing zerocopy reference in pskb_carve helpers
Summary
In the Linux kernel, the following vulnerability has been resolved:
net: skbuff: fix missing zerocopy reference in pskb_carve helpers
pskb_carve_inside_header() and pskb_carve_inside_nonlinear() both copy
the old skb_shared_info header into a new buffer via memcpy(), which
includes the destructor_arg pointer (uarg) for MSG_ZEROCOPY skbs.
Neither function calls net_zcopy_get() for the new shinfo, creating an
unaccounted holder: every skb_shared_info with destructor_arg set will
call skb_zcopy_clear() once when freed, but the corresponding
net_zcopy_get() was never called for the new copy. Repeated calls
drive uarg->refcnt to zero prematurely, freeing ubuf_info_msgzc while
TX skbs still hold live destructor_arg pointers.
KASAN reports use-after-free on a freed ubuf_info_msgzc:
BUG: KASAN: slab-use-after-free in skb_release_data+0x77b/0x810
Read of size 8 at addr ffff88801574d3e8 by task poc/220
Call Trace:
skb_release_data+0x77b/0x810
kfree_skb_list_reason+0x13e/0x610
skb_release_data+0x4cd/0x810
sk_skb_reason_drop+0xf3/0x340
skb_queue_purge_reason+0x282/0x440
rds_tcp_inc_free+0x1e/0x30
rds_recvmsg+0x354/0x1780
__sys_recvmsg+0xdf/0x180
Allocated by task 219:
msg_zerocopy_realloc+0x157/0x7b0
tcp_sendmsg_locked+0x2892/0x3ba0
Freed by task 219:
ip_recv_error+0x74a/0xb10
tcp_recvmsg+0x475/0x530
The skb consuming the late access still referenced the same uarg via
shinfo->destructor_arg copied by pskb_carve_inside_nonlinear() without
a refcount bump. This has been verified to be reliably exploitable: a
working proof-of-concept achieves full root privilege escalation from
an unprivileged local user on a default kernel configuration.
The fix follows the pattern of pskb_expand_head() which has the same
memcpy/cloned structure. For pskb_carve_inside_header(), net_zcopy_get()
is placed after skb_orphan_frags() succeeds, so the orphan error path
needs no cleanup. For pskb_carve_inside_nonlinear(), net_zcopy_get() is
placed after all failure points and just before skb_release_data(), so
no error path needs cleanup at all -- matching pskb_expand_head() more
closely and avoiding the need for a balancing net_zcopy_put().
Severity
7.8 (High)
CWE
- CWE-911 - Improper Update of Reference Count
Assigner
References
11 references
Impacted products
7 products
| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
6fa01ccd883021105e9f8af7d04b9f156fa3494a , < 8dbed691e43a50903658130bde0fcb5abc425b37
(git)
Affected: 6fa01ccd883021105e9f8af7d04b9f156fa3494a , < 9b40bdc2a3298225dffab8158208a0d8c6300578 (git) Affected: 6fa01ccd883021105e9f8af7d04b9f156fa3494a , < fd470f0a97b8e9a125f520265d2f3b088ffb5b8a (git) Affected: 6fa01ccd883021105e9f8af7d04b9f156fa3494a , < ceafb893b12f23331dcc5ff9587e643c3a40ee9f (git) Affected: 6fa01ccd883021105e9f8af7d04b9f156fa3494a , < 2e0e74c59b2761a414d9f48d7bee1e45220b2427 (git) Affected: 6fa01ccd883021105e9f8af7d04b9f156fa3494a , < 96a4713ae041cc85e712bac682cd2e644004d6c6 (git) Affected: 6fa01ccd883021105e9f8af7d04b9f156fa3494a , < 474d6c771d798bca84f0a140b611e36743511e18 (git) Affected: 6fa01ccd883021105e9f8af7d04b9f156fa3494a , < 98d0912e9f841e5529a5b89a972805f34cb1c69d (git) |
|
| Linux | Linux |
Affected:
4.7
Unaffected: 0 , < 4.7 (semver) Unaffected: 5.10.259 , ≤ 5.10.* (semver) Unaffected: 5.15.210 , ≤ 5.15.* (semver) Unaffected: 6.1.176 , ≤ 6.1.* (semver) Unaffected: 6.6.143 , ≤ 6.6.* (semver) Unaffected: 6.12.93 , ≤ 6.12.* (semver) Unaffected: 6.18.35 , ≤ 6.18.* (semver) Unaffected: 7.0.12 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix) |
|
| Red Hat | Red Hat Enterprise Linux 10 |
cpe:/o:redhat:enterprise_linux:10 |
|
| Red Hat | Red Hat Enterprise Linux 6 |
cpe:/o:redhat:enterprise_linux:6 |
|
| Red Hat | Red Hat Enterprise Linux 7 |
cpe:/o:redhat:enterprise_linux:7 |
|
| Red Hat | Red Hat Enterprise Linux 8 |
cpe:/o:redhat:enterprise_linux:8 |
|
| Red Hat | Red Hat Enterprise Linux 9 |
cpe:/o:redhat:enterprise_linux:9 |
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Repeated calls\\ndrive uarg-\u003erefcnt to zero prematurely, freeing ubuf_info_msgzc while\\nTX skbs still hold live destructor_arg pointers.\\n\\nKASAN reports use-after-free on a freed ubuf_info_msgzc:\\n\\n BUG: KASAN: slab-use-after-free in skb_release_data+0x77b/0x810\\n Read of size 8 at addr ffff88801574d3e8 by task poc/220\\n\\n Call Trace:\\n skb_release_data+0x77b/0x810\\n kfree_skb_list_reason+0x13e/0x610\\n skb_release_data+0x4cd/0x810\\n sk_skb_reason_drop+0xf3/0x340\\n skb_queue_purge_reason+0x282/0x440\\n rds_tcp_inc_free+0x1e/0x30\\n rds_recvmsg+0x354/0x1780\\n __sys_recvmsg+0xdf/0x180\\n\\n Allocated by task 219:\\n msg_zerocopy_realloc+0x157/0x7b0\\n tcp_sendmsg_locked+0x2892/0x3ba0\\n\\n Freed by task 219:\\n ip_recv_error+0x74a/0xb10\\n tcp_recvmsg+0x475/0x530\\n\\nThe skb consuming the late access still referenced the same uarg via\\nshinfo-\u003edestructor_arg copied by pskb_carve_inside_nonlinear() without\\na refcount bump. This has been verified to be reliably exploitable: a\\nworking proof-of-concept achieves full root privilege escalation from\\nan unprivileged local user on a default kernel configuration.\\n\\nThe fix follows the pattern of pskb_expand_head() which has the same\\nmemcpy/cloned structure. For pskb_carve_inside_header(), net_zcopy_get()\\nis placed after skb_orphan_frags() succeeds, so the orphan error path\\nneeds no cleanup. For pskb_carve_inside_nonlinear(), net_zcopy_get() is\\nplaced after all failure points and just before skb_release_data(), so\\nno error path needs cleanup at all -- matching pskb_expand_head() more\\nclosely and avoiding the need for a balancing net_zcopy_put().\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/core/skbuff.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6fa01ccd883021105e9f8af7d04b9f156fa3494a\",\"lessThan\":\"8dbed691e43a50903658130bde0fcb5abc425b37\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6fa01ccd883021105e9f8af7d04b9f156fa3494a\",\"lessThan\":\"9b40bdc2a3298225dffab8158208a0d8c6300578\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6fa01ccd883021105e9f8af7d04b9f156fa3494a\",\"lessThan\":\"fd470f0a97b8e9a125f520265d2f3b088ffb5b8a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6fa01ccd883021105e9f8af7d04b9f156fa3494a\",\"lessThan\":\"ceafb893b12f23331dcc5ff9587e643c3a40ee9f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6fa01ccd883021105e9f8af7d04b9f156fa3494a\",\"lessThan\":\"2e0e74c59b2761a414d9f48d7bee1e45220b2427\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6fa01ccd883021105e9f8af7d04b9f156fa3494a\",\"lessThan\":\"96a4713ae041cc85e712bac682cd2e644004d6c6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6fa01ccd883021105e9f8af7d04b9f156fa3494a\",\"lessThan\":\"474d6c771d798bca84f0a140b611e36743511e18\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6fa01ccd883021105e9f8af7d04b9f156fa3494a\",\"lessThan\":\"98d0912e9f841e5529a5b89a972805f34cb1c69d\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/core/skbuff.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.7\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.7\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.259\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.210\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.176\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.143\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.93\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.35\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.12\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]},{\"source\":\"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\",\"affectedData\":[{\"vendor\":\"Red Hat\",\"product\":\"Red Hat Enterprise Linux 10\",\"defaultStatus\":\"unaffected\",\"cpes\":[\"cpe:/o:redhat:enterprise_linux:10\"]},{\"vendor\":\"Red Hat\",\"product\":\"Red Hat Enterprise Linux 6\",\"defaultStatus\":\"unaffected\",\"cpes\":[\"cpe:/o:redhat:enterprise_linux:6\"]},{\"vendor\":\"Red Hat\",\"product\":\"Red Hat Enterprise Linux 7\",\"defaultStatus\":\"unaffected\",\"cpes\":[\"cpe:/o:redhat:enterprise_linux:7\"]},{\"vendor\":\"Red Hat\",\"product\":\"Red Hat Enterprise Linux 8\",\"defaultStatus\":\"unaffected\",\"cpes\":[\"cpe:/o:redhat:enterprise_linux:8\"]},{\"vendor\":\"Red Hat\",\"product\":\"Red Hat Enterprise Linux 9\",\"defaultStatus\":\"unaffected\",\"cpes\":[\"cpe:/o:redhat:enterprise_linux:9\"]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9},{\"source\":\"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-911\"}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2e0e74c59b2761a414d9f48d7bee1e45220b2427\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/474d6c771d798bca84f0a140b611e36743511e18\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8dbed691e43a50903658130bde0fcb5abc425b37\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/96a4713ae041cc85e712bac682cd2e644004d6c6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/98d0912e9f841e5529a5b89a972805f34cb1c69d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9b40bdc2a3298225dffab8158208a0d8c6300578\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ceafb893b12f23331dcc5ff9587e643c3a40ee9f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fd470f0a97b8e9a125f520265d2f3b088ffb5b8a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://access.redhat.com/security/cve/CVE-2026-52943\",\"source\":\"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\"},{\"url\":\"https://bugzilla.redhat.com/show_bug.cgi?id=2492137\",\"source\":\"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\"},{\"url\":\"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-52943.json\",\"source\":\"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\"}]}}"
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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