FKIE_CVE-2025-40231

Vulnerability from fkie_nvd - Published: 2025-12-04 16:16 - Updated: 2026-06-17 09:21
Severity
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().
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/09bba278ccde25a14b6e5088a9e65a8717d0cccf
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/251caee792a21eb0b781aab91362b422c945e162
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/42ed0784d11adebf748711e503af0eb9f1e6d81d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a2a4346eea8b4cb75037dbcb20b98cb454324f80
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b44182c116778feaa05da52a426aeb9da1878dcf
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ce4f856c64f0bc30e29302a0ce41f4295ca391c5
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f7c877e7535260cc7a21484c994e8ce7e8cb6780
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/vmw_vsock/af_vsock.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "ce4f856c64f0bc30e29302a0ce41f4295ca391c5",
              "status": "affected",
              "version": "8667e8d0eb46bc54fdae30ba2f4786407d3d88eb",
              "versionType": "git"
            },
            {
              "lessThan": "09bba278ccde25a14b6e5088a9e65a8717d0cccf",
              "status": "affected",
              "version": "36a439049b34cca0b3661276049b84a1f76cc21a",
              "versionType": "git"
            },
            {
              "lessThan": "b44182c116778feaa05da52a426aeb9da1878dcf",
              "status": "affected",
              "version": "9ce53e744f18e73059d3124070e960f3aa9902bf",
              "versionType": "git"
            },
            {
              "lessThan": "42ed0784d11adebf748711e503af0eb9f1e6d81d",
              "status": "affected",
              "version": "9d24bb6780282b0255b9929abe5e8f98007e2c6e",
              "versionType": "git"
            },
            {
              "lessThan": "251caee792a21eb0b781aab91362b422c945e162",
              "status": "affected",
              "version": "ae2c712ba39c7007de63cb0c75b51ce1caaf1da5",
              "versionType": "git"
            },
            {
              "lessThan": "a2a4346eea8b4cb75037dbcb20b98cb454324f80",
              "status": "affected",
              "version": "687aa0c5581b8d4aa87fd92973e4ee576b550cdf",
              "versionType": "git"
            },
            {
              "lessThan": "f7c877e7535260cc7a21484c994e8ce7e8cb6780",
              "status": "affected",
              "version": "687aa0c5581b8d4aa87fd92973e4ee576b550cdf",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "7b73bddf54777fb62d4d8c7729d0affe6df04477",
              "versionType": "git"
            },
            {
              "lessThan": "5.10.246",
              "status": "affected",
              "version": "5.10.240",
              "versionType": "semver"
            },
            {
              "lessThan": "5.15.196",
              "status": "affected",
              "version": "5.15.189",
              "versionType": "semver"
            },
            {
              "lessThan": "6.1.158",
              "status": "affected",
              "version": "6.1.146",
              "versionType": "semver"
            },
            {
              "lessThan": "6.6.115",
              "status": "affected",
              "version": "6.6.99",
              "versionType": "semver"
            },
            {
              "lessThan": "6.12.56",
              "status": "affected",
              "version": "6.12.39",
              "versionType": "semver"
            },
            {
              "lessThan": "6.16",
              "status": "affected",
              "version": "6.15.7",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/vmw_vsock/af_vsock.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.16"
            },
            {
              "lessThan": "6.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.246",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.196",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.158",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.115",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.56",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "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\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()."
    }
  ],
  "id": "CVE-2025-40231",
  "lastModified": "2026-06-17T09:21:29.853",
  "metrics": {},
  "published": "2025-12-04T16:16:15.870",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/09bba278ccde25a14b6e5088a9e65a8717d0cccf"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/251caee792a21eb0b781aab91362b422c945e162"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/42ed0784d11adebf748711e503af0eb9f1e6d81d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a2a4346eea8b4cb75037dbcb20b98cb454324f80"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b44182c116778feaa05da52a426aeb9da1878dcf"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ce4f856c64f0bc30e29302a0ce41f4295ca391c5"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f7c877e7535260cc7a21484c994e8ce7e8cb6780"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Deferred"
}


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