CVE-2025-40231 (GCVE-0-2025-40231)
Vulnerability from cvelistv5
Published
2025-12-04 15:31
Modified
2025-12-04 15:31
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
Impacted products
Vendor Product Version
Linux Linux Version: 8667e8d0eb46bc54fdae30ba2f4786407d3d88eb
Version: 36a439049b34cca0b3661276049b84a1f76cc21a
Version: 9ce53e744f18e73059d3124070e960f3aa9902bf
Version: 9d24bb6780282b0255b9929abe5e8f98007e2c6e
Version: ae2c712ba39c7007de63cb0c75b51ce1caaf1da5
Version: 687aa0c5581b8d4aa87fd92973e4ee576b550cdf
Version: 687aa0c5581b8d4aa87fd92973e4ee576b550cdf
Version: 7b73bddf54777fb62d4d8c7729d0affe6df04477
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          "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()."
        }
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        "dateUpdated": "2025-12-04T15:31:22.199Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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    "cveId": "CVE-2025-40231",
    "datePublished": "2025-12-04T15:31:22.199Z",
    "dateReserved": "2025-04-16T07:20:57.180Z",
    "dateUpdated": "2025-12-04T15:31:22.199Z",
    "state": "PUBLISHED"
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  }
}


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