CVE-2026-99032 (GCVE-0-2026-99032)
Vulnerability from cvelistv5
Published
2026-10-23 12:21
Modified
2026-10-30 12:41
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
net/smc: protect clcsock lifetime in smc_getname
smc_getname() dereferences smc->clcsock without holding
clcsock_release_lock. Link-group termination can release the CLC socket
through smc_close_active_abort() while the SMC socket is still open,
for example after shutdown(SHUT_WR).
A getsockname() caller can load smc->clcsock, then the termination worker
can clear the pointer and call sock_release() before the caller accesses
clcsock->ops or invokes getname(). This causes a use-after-free; if the
worker clears the pointer before the load, it causes a NULL dereference.
The syscall's file reference keeps the SMC socket alive but does not
prevent asynchronous release of its CLC socket.
KASAN reported the following with test-only timing instrumentation:
BUG: KASAN: slab-use-after-free in smc_getname+0x19e/0x1b0
Read of size 8 at addr ffff888109abb4e0 by task poc/103
Call Trace:
smc_getname+0x19e/0x1b0
do_getsockname+0xe5/0x170
__sys_getsockname+0x8c/0x100
Allocated by task 95:
sock_alloc_inode+0x1e/0x280
sock_alloc+0x3d/0x240
__sock_create+0x7e/0x430
smc_create+0x121/0x240
Freed by task 0:
kmem_cache_free+0xcc/0x340
rcu_core+0x50a/0x1850
Last potentially related work creation:
evict+0x446/0x6c0
smc_clcsock_release+0xa8/0xd0
smc_close_active_abort+0x26a/0x3a0
__smc_lgr_terminate.part.0+0x137/0x2e0
Hold clcsock_release_lock across the pointer check and the getname()
callback to serialize with smc_clcsock_release(). Return -EBADF if the
CLC socket has already been released, preserving the existing peer
state check and the callback's return value otherwise.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: b03faa1fafc8018295401dc558bdc76362d860a4 Version: b03faa1fafc8018295401dc558bdc76362d860a4 Version: b03faa1fafc8018295401dc558bdc76362d860a4 Version: b03faa1fafc8018295401dc558bdc76362d860a4 Version: b03faa1fafc8018295401dc558bdc76362d860a4 Version: b03faa1fafc8018295401dc558bdc76362d860a4 Version: b03faa1fafc8018295401dc558bdc76362d860a4 Version: b03faa1fafc8018295401dc558bdc76362d860a4 Version: 0b6153d04c96a1d4b6284692386aa21d04d7956c Version: 4.19.299 ≤ |
||
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/smc/af_smc.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "5d0fa089d5ed497366ea5c000c6eefb346c7cb01",
"status": "affected",
"version": "b03faa1fafc8018295401dc558bdc76362d860a4",
"versionType": "git"
},
{
"lessThan": "94a43efd71ad440c35dd469559d3a6d665f102d9",
"status": "affected",
"version": "b03faa1fafc8018295401dc558bdc76362d860a4",
"versionType": "git"
},
{
"lessThan": "04069199816285c49199a35971f4298199609687",
"status": "affected",
"version": "b03faa1fafc8018295401dc558bdc76362d860a4",
"versionType": "git"
},
{
"lessThan": "e607017a553d2a48e428ec8b8ffb06bf3bb92ce9",
"status": "affected",
"version": "b03faa1fafc8018295401dc558bdc76362d860a4",
"versionType": "git"
},
{
"lessThan": "1512e3714b3946bda75a160a34f22a51710daa43",
"status": "affected",
"version": "b03faa1fafc8018295401dc558bdc76362d860a4",
"versionType": "git"
},
{
"lessThan": "6a1833f0d7dc037c8e876b9178ba69d5d107c086",
"status": "affected",
"version": "b03faa1fafc8018295401dc558bdc76362d860a4",
"versionType": "git"
},
{
"lessThan": "c223da71abfaea2ebb1c7208ae9ebf15038f9388",
"status": "affected",
"version": "b03faa1fafc8018295401dc558bdc76362d860a4",
"versionType": "git"
},
{
"lessThan": "64a6b36b0e1855288080bc5f89769f27d6dc03c8",
"status": "affected",
"version": "b03faa1fafc8018295401dc558bdc76362d860a4",
"versionType": "git"
},
{
"status": "affected",
"version": "0b6153d04c96a1d4b6284692386aa21d04d7956c",
"versionType": "git"
},
{
"lessThan": "4.20",
"status": "affected",
"version": "4.19.299",
"versionType": "semver"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/smc/af_smc.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.1"
},
{
"lessThan": "5.1",
"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": "6.12.113",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.57",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"version": "7.2.11",
"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": "5.1",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.224",
"versionStartIncluding": "5.1",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.191",
"versionStartIncluding": "5.1",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.160",
"versionStartIncluding": "5.1",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.113",
"versionStartIncluding": "5.1",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.57",
"versionStartIncluding": "5.1",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2.11",
"versionStartIncluding": "5.1",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.3",
"versionStartIncluding": "5.1",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.19.299",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: protect clcsock lifetime in smc_getname\n\nsmc_getname() dereferences smc-\u003eclcsock without holding\nclcsock_release_lock. Link-group termination can release the CLC socket\nthrough smc_close_active_abort() while the SMC socket is still open,\nfor example after shutdown(SHUT_WR).\n\nA getsockname() caller can load smc-\u003eclcsock, then the termination worker\ncan clear the pointer and call sock_release() before the caller accesses\nclcsock-\u003eops or invokes getname(). This causes a use-after-free; if the\nworker clears the pointer before the load, it causes a NULL dereference.\nThe syscall\u0027s file reference keeps the SMC socket alive but does not\nprevent asynchronous release of its CLC socket.\n\nKASAN reported the following with test-only timing instrumentation:\n\n BUG: KASAN: slab-use-after-free in smc_getname+0x19e/0x1b0\n Read of size 8 at addr ffff888109abb4e0 by task poc/103\n Call Trace:\n smc_getname+0x19e/0x1b0\n do_getsockname+0xe5/0x170\n __sys_getsockname+0x8c/0x100\n\n Allocated by task 95:\n sock_alloc_inode+0x1e/0x280\n sock_alloc+0x3d/0x240\n __sock_create+0x7e/0x430\n smc_create+0x121/0x240\n\n Freed by task 0:\n kmem_cache_free+0xcc/0x340\n rcu_core+0x50a/0x1850\n\n Last potentially related work creation:\n evict+0x446/0x6c0\n smc_clcsock_release+0xa8/0xd0\n smc_close_active_abort+0x26a/0x3a0\n __smc_lgr_terminate.part.0+0x137/0x2e0\n\nHold clcsock_release_lock across the pointer check and the getname()\ncallback to serialize with smc_clcsock_release(). Return -EBADF if the\nCLC socket has already been released, preserving the existing peer\nstate check and the callback\u0027s return value otherwise."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - getsockname(2) on an attacker-owned SMC fd follows __sys_getsockname()-\u003edo_getsockname()-\u003esmc_getname(), whose unlocked clcsock dereference is the fault; no SMC/TCP message invokes smc_getname(), so a remote peer alone cannot trigger it.\nAC:L - After shutdown(SHUT_WR) moves the socket to SMC_PEERCLOSEWAIT1, the attacker can loop getsockname() while its SMC peer sends LLC DELETE LINK ALL, driving __smc_lgr_terminate()-\u003esmc_close_active_abort()-\u003esmc_clcsock_release(); both race sides are attacker-controlled.\nPR:L - smc_create() accepts SOCK_STREAM with SMCPROTO_SMC or SMCPROTO_SMC6 without capable() or ns_capable(), while shutdown() and getsockname() require only the socket fd; an ordinary local user can execute the complete path.\nUI:N - The attacker creates and connects the SMC socket, calls shutdown(SHUT_WR), and races getsockname() against termination without requiring another user to mount, open, or approve anything.\nS:U - smc_getname() and the freed CLC socket execute within the same host kernel security authority; this path crosses no guest-host, IOMMU, or other separately governed boundary.\nC:H - The stale struct socket contains both ops and sk; after sock_inode_cache reuse, the indirect getname callback can consume attacker-groomed recycled socket state and return data to userspace, giving the UAF a kernel-memory disclosure primitive.\nI:H - The freed struct socket supplies the indirect ops-\u003egetname target and its sk operand; reclaiming it with attacker-created sockets permits callback/operand confusion and mutable kernel-socket access, supporting control-flow or write-oriented exploitation.\nA:H - If smc_clcsock_release() clears the pointer first, smc_getname() dereferences NULL; if freeing follows the caller\u0027s load, KASAN confirms a slab use-after-free. Either path can produce a kernel oops or panic."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-10-30T12:41:05.122Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/5d0fa089d5ed497366ea5c000c6eefb346c7cb01"
},
{
"url": "https://git.kernel.org/stable/c/94a43efd71ad440c35dd469559d3a6d665f102d9"
},
{
"url": "https://git.kernel.org/stable/c/04069199816285c49199a35971f4298199609687"
},
{
"url": "https://git.kernel.org/stable/c/e607017a553d2a48e428ec8b8ffb06bf3bb92ce9"
},
{
"url": "https://git.kernel.org/stable/c/1512e3714b3946bda75a160a34f22a51710daa43"
},
{
"url": "https://git.kernel.org/stable/c/6a1833f0d7dc037c8e876b9178ba69d5d107c086"
},
{
"url": "https://git.kernel.org/stable/c/c223da71abfaea2ebb1c7208ae9ebf15038f9388"
},
{
"url": "https://git.kernel.org/stable/c/64a6b36b0e1855288080bc5f89769f27d6dc03c8"
}
],
"title": "net/smc: protect clcsock lifetime in smc_getname",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-99032",
"datePublished": "2026-10-23T12:21:36.202Z",
"dateReserved": "2026-09-25T10:25:14.387Z",
"dateUpdated": "2026-10-30T12:41:05.122Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
Loading…
Loading…
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
Loading…
Loading…