CVE-2025-40231 (GCVE-0-2025-40231)

Vulnerability from cvelistv5 – Published: 2025-12-04 15:31 – Updated: 2026-05-23 16:01
VLAI
Title
vsock: fix lock inversion in vsock_assign_transport()
Summary
In the Linux kernel, the following vulnerability has been resolved: vsock: fix lock inversion in vsock_assign_transport() Syzbot reported a potential lock inversion deadlock between vsock_register_mutex and sk_lock-AF_VSOCK when vsock_linger() is called. The issue was introduced by commit 687aa0c5581b ("vsock: Fix transport_* TOCTOU") which added vsock_register_mutex locking in vsock_assign_transport() around the transport->release() call, that can call vsock_linger(). vsock_assign_transport() can be called with sk_lock held. vsock_linger() calls sk_wait_event() that temporarily releases and re-acquires sk_lock. During this window, if another thread hold vsock_register_mutex while trying to acquire sk_lock, a circular dependency is created. Fix this by releasing vsock_register_mutex before calling transport->release() and vsock_deassign_transport(). This is safe because we don't need to hold vsock_register_mutex while releasing the old transport, and we ensure the new transport won't disappear by obtaining a module reference first via try_module_get().
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6843 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 8667e8d0eb46bc54fdae30ba2f4786407d3d88eb , < ce4f856c64f0bc30e29302a0ce41f4295ca391c5 (git)
Affected: 36a439049b34cca0b3661276049b84a1f76cc21a , < 09bba278ccde25a14b6e5088a9e65a8717d0cccf (git)
Affected: 9ce53e744f18e73059d3124070e960f3aa9902bf , < b44182c116778feaa05da52a426aeb9da1878dcf (git)
Affected: 9d24bb6780282b0255b9929abe5e8f98007e2c6e , < 42ed0784d11adebf748711e503af0eb9f1e6d81d (git)
Affected: ae2c712ba39c7007de63cb0c75b51ce1caaf1da5 , < 251caee792a21eb0b781aab91362b422c945e162 (git)
Affected: 687aa0c5581b8d4aa87fd92973e4ee576b550cdf , < a2a4346eea8b4cb75037dbcb20b98cb454324f80 (git)
Affected: 687aa0c5581b8d4aa87fd92973e4ee576b550cdf , < f7c877e7535260cc7a21484c994e8ce7e8cb6780 (git)
Affected: 7b73bddf54777fb62d4d8c7729d0affe6df04477 (git)
Affected: 5.10.240 , < 5.10.246 (semver)
Affected: 5.15.189 , < 5.15.196 (semver)
Affected: 6.1.146 , < 6.1.158 (semver)
Affected: 6.6.99 , < 6.6.115 (semver)
Affected: 6.12.39 , < 6.12.56 (semver)
Affected: 6.15.7 , < 6.16 (semver)
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Linux Linux Affected: 6.16
Unaffected: 0 , < 6.16 (semver)
Unaffected: 5.10.246 , ≤ 5.10.* (semver)
Unaffected: 5.15.196 , ≤ 5.15.* (semver)
Unaffected: 6.1.158 , ≤ 6.1.* (semver)
Unaffected: 6.6.115 , ≤ 6.6.* (semver)
Unaffected: 6.12.56 , ≤ 6.12.* (semver)
Unaffected: 6.17.6 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
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          "url": "https://git.kernel.org/stable/c/f7c877e7535260cc7a21484c994e8ce7e8cb6780"
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          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvsock: fix lock inversion in vsock_assign_transport()\n\nSyzbot reported a potential lock inversion deadlock between\nvsock_register_mutex and sk_lock-AF_VSOCK when vsock_linger() is called.\n\nThe issue was introduced by commit 687aa0c5581b (\"vsock: Fix\ntransport_* TOCTOU\") which added vsock_register_mutex locking in\nvsock_assign_transport() around the transport-\u003erelease() call, that can\ncall vsock_linger(). vsock_assign_transport() can be called with sk_lock\nheld. vsock_linger() calls sk_wait_event() that temporarily releases and\nre-acquires sk_lock. During this window, if another thread hold\nvsock_register_mutex while trying to acquire sk_lock, a circular\ndependency is created.\n\nFix this by releasing vsock_register_mutex before calling\ntransport-\u003erelease() and vsock_deassign_transport(). This is safe\nbecause we don\u0027t need to hold vsock_register_mutex while releasing the\nold transport, and we ensure the new transport won\u0027t disappear by\nobtaining a module reference first via try_module_get()."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nvsock: corrige la inversi\u00f3n de bloqueo en vsock_assign_transport()\n\nSyzbot inform\u00f3 un posible interbloqueo por inversi\u00f3n de bloqueo entre vsock_register_mutex y sk_lock-AF_VSOCK cuando se llama a vsock_linger().\n\nEl problema fue introducido por el commit 687aa0c5581b (\u201cvsock: Corrige transport_* TOCTOU\u201d) que a\u00f1adi\u00f3 el bloqueo de vsock_register_mutex en vsock_assign_transport() alrededor de la llamada a transport-\u003erelease(), que puede llamar a vsock_linger(). vsock_assign_transport() puede ser llamado con sk_lock retenido. vsock_linger() llama a sk_wait_event() que libera y vuelve a adquirir temporalmente sk_lock. Durante esta ventana, si otro hilo retiene vsock_register_mutex mientras intenta adquirir sk_lock, se crea una dependencia circular.\n\nSoluciona esto liberando vsock_register_mutex antes de llamar a transport-\u003erelease() y vsock_deassign_transport(). Esto es seguro porque no necesitamos retener vsock_register_mutex mientras liberamos el transporte antiguo, y nos aseguramos de que el nuevo transporte no desaparecer\u00e1 obteniendo primero una referencia de m\u00f3dulo a trav\u00e9s de try_module_get()."
          }
        ],
        "id": "CVE-2025-40231",
        "lastModified": "2026-10-19T21:10:00.160",
        "metrics": {},
        "published": "2025-12-04T16:16:15.870",
        "references": [
          {
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
      }
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-30T10:20:06+00:00",
      "cve": "CVE-2025-40231",
      "id": "CVE-2025-40231",
      "initial_release_date": "2025-12-04T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: vsock: fix lock inversion in vsock_assign_transport()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-40231.json",
      "version": "3"
    }
  }
}



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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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