{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-99032", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.387Z", "datePublished": "2026-10-23T12:21:36.202Z", "dateUpdated": "2026-10-24T14:10:08.095Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-24T14:10:08.095Z" }, "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->clcsock 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->clcsock, then the termination worker\ncan clear the pointer and call sock_release() before the caller accesses\nclcsock->ops 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's 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's return value otherwise." } ], "metrics": [ { "cvssV3_1": { "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" }, "scenarios": [ { "lang": "en", "value": "AV:L - getsockname(2) on an attacker-owned SMC fd follows __sys_getsockname()->do_getsockname()->smc_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()->smc_close_active_abort()->smc_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->getname 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's load, KASAN confirms a slab use-after-free. Either path can produce a kernel oops or panic." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/smc/af_smc.c" ], "versions": [ { "version": "b03faa1fafc8018295401dc558bdc76362d860a4", "lessThan": "e607017a553d2a48e428ec8b8ffb06bf3bb92ce9", "status": "affected", "versionType": "git" }, { "version": "b03faa1fafc8018295401dc558bdc76362d860a4", "lessThan": "1512e3714b3946bda75a160a34f22a51710daa43", "status": "affected", "versionType": "git" }, { "version": "b03faa1fafc8018295401dc558bdc76362d860a4", "lessThan": "6a1833f0d7dc037c8e876b9178ba69d5d107c086", "status": "affected", "versionType": "git" }, { "version": "b03faa1fafc8018295401dc558bdc76362d860a4", "lessThan": "c223da71abfaea2ebb1c7208ae9ebf15038f9388", "status": "affected", "versionType": "git" }, { "version": "b03faa1fafc8018295401dc558bdc76362d860a4", "lessThan": "64a6b36b0e1855288080bc5f89769f27d6dc03c8", "status": "affected", "versionType": "git" }, { "version": "0b6153d04c96a1d4b6284692386aa21d04d7956c", "status": "affected", "versionType": "git" }, { "version": "4.19.299", "lessThan": "4.20", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/smc/af_smc.c" ], "versions": [ { "version": "5.1", "status": "affected" }, { "version": "0", "lessThan": "5.1", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.113", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.57", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.11", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "6.6.160" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "6.12.113" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "6.18.57" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "7.2.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "7.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19.299" } ] } ] } ], "references": [ { "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" } } } }