net/smc: protect clcsock lifetime in smc_getname
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().
CVE-2026-99032
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-99032
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "b03faa1fafc8018295401dc558bdc76362d860a4",
"lessThan": "e607017a553d2a48e428ec8b8ffb06bf3bb92ce9",
"versionType": "git"
},
{
"status": "affected",
"version": "b03faa1fafc8018295401dc558bdc76362d860a4",
"lessThan": "1512e3714b3946bda75a160a34f22a51710daa43",
"versionType": "git"
},
{
"status": "affected",
"version": "b03faa1fafc8018295401dc558bdc76362d860a4",
"lessThan": "6a1833f0d7dc037c8e876b9178ba69d5d107c086",
"versionType": "git"
},
{
"status": "affected",
"version": "b03faa1fafc8018295401dc558bdc76362d860a4",
"lessThan": "c223da71abfaea2ebb1c7208ae9ebf15038f9388",
"versionType": "git"
},
{
"status": "affected",
"version": "b03faa1fafc8018295401dc558bdc76362d860a4",
"lessThan": "64a6b36b0e1855288080bc5f89769f27d6dc03c8",
"versionType": "git"
},
{
"status": "affected",
"version": "0b6153d04c96a1d4b6284692386aa21d04d7956c",
"versionType": "git"
},
{
"status": "affected",
"version": "4.19.299",
"lessThan": "4.20",
"versionType": "semver"
}
],
"programFiles": [
"net/smc/af_smc.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.1"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.1",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.113",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.57",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.11",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/smc/af_smc.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-99032
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #55737 · Revision 1
- Added to Heist Feed
- Publisher date