Vulnerability-Lookup

GHSA-7G97-V76M-W626

Vulnerability from github – Published: 2026-10-23 15:31 – Updated: 2026-10-24 15:32

Details

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.

Severity

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-99032"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-23T13:17:26Z",
    "severity": "HIGH"
  },
  "details": "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": "GHSA-7g97-v76m-w626",
  "modified": "2026-10-24T15:32:50Z",
  "published": "2026-10-23T15:31:35Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-99032"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1512e3714b3946bda75a160a34f22a51710daa43"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/64a6b36b0e1855288080bc5f89769f27d6dc03c8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6a1833f0d7dc037c8e876b9178ba69d5d107c086"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c223da71abfaea2ebb1c7208ae9ebf15038f9388"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e607017a553d2a48e428ec8b8ffb06bf3bb92ce9"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-99032 (GCVE-0-2026-99032)

Vulnerability from cvelistv5 – Published: 2026-10-23 12:21 – Updated: 2026-10-24 14:10

Title

net/smc: protect clcsock lifetime in smc_getname

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.

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 7056 records in the last 180 days details

References

5 references

URL	Tags
https://git.kernel.org/stable/c/e607017a553d2a48e…
https://git.kernel.org/stable/c/1512e3714b3946bda…
https://git.kernel.org/stable/c/6a1833f0d7dc037c8…
https://git.kernel.org/stable/c/c223da71abfaea2eb…
https://git.kernel.org/stable/c/64a6b36b0e1855288…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: b03faa1fafc8018295401dc558bdc76362d860a4 , < e607017a553d2a48e428ec8b8ffb06bf3bb92ce9 (git) Affected: b03faa1fafc8018295401dc558bdc76362d860a4 , < 1512e3714b3946bda75a160a34f22a51710daa43 (git) Affected: b03faa1fafc8018295401dc558bdc76362d860a4 , < 6a1833f0d7dc037c8e876b9178ba69d5d107c086 (git) Affected: b03faa1fafc8018295401dc558bdc76362d860a4 , < c223da71abfaea2ebb1c7208ae9ebf15038f9388 (git) Affected: b03faa1fafc8018295401dc558bdc76362d860a4 , < 64a6b36b0e1855288080bc5f89769f27d6dc03c8 (git) Affected: 0b6153d04c96a1d4b6284692386aa21d04d7956c (git) Affected: 4.19.299 , < 4.20 (semver)
Linux	Linux	Affected: 5.1 Unaffected: 0 , < 5.1 (semver) Unaffected: 6.6.160 , ≤ 6.6.* (semver) Unaffected: 6.12.113 , ≤ 6.12.* (semver) Unaffected: 6.18.57 , ≤ 6.18.* (semver) Unaffected: 7.2.11 , ≤ 7.2.* (semver) Unaffected: 7.3 , ≤ * (original_commit_for_fix)

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JSON

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{
  "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": "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"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "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": "2026-10-24T14:10:08.095Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
      }
    }
  },
  "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": "2026-10-24T14:10:08.095Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

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