FKIE_CVE-2026-99032

Vulnerability from fkie_nvd - Published: 2026-10-23 13:17 - Updated: 2026-10-24 14:16
Severity
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1512e3714b3946bda75a160a34f22a51710daa43
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/64a6b36b0e1855288080bc5f89769f27d6dc03c8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6a1833f0d7dc037c8e876b9178ba69d5d107c086
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c223da71abfaea2ebb1c7208ae9ebf15038f9388
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e607017a553d2a48e428ec8b8ffb06bf3bb92ce9
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "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": "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": "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"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "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."
    }
  ],
  "id": "CVE-2026-99032",
  "lastModified": "2026-10-24T14:16:53.197",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-10-23T13:17:26.310",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1512e3714b3946bda75a160a34f22a51710daa43"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/64a6b36b0e1855288080bc5f89769f27d6dc03c8"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6a1833f0d7dc037c8e876b9178ba69d5d107c086"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c223da71abfaea2ebb1c7208ae9ebf15038f9388"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e607017a553d2a48e428ec8b8ffb06bf3bb92ce9"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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