Description (CNA)
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().
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 8667e8d0eb46bc54fdae30ba2f4786407d3d88eb before ce4f856c64f0bc30e29302a0ce41f4295ca391c5; affected 36a439049b34cca0b3661276049b84a1f76cc21a before 09bba278ccde25a14b6e5088a9e65a8717d0cccf; affected 9ce53e744f18e73059d3124070e960f3aa9902bf before b44182c116778feaa05da52a426aeb9da1878dcf; affected 9d24bb6780282b0255b9929abe5e8f98007e2c6e before 42ed0784d11adebf748711e503af0eb9f1e6d81d; affected ae2c712ba39c7007de63cb0c75b51ce1caaf1da5 before 251caee792a21eb0b781aab91362b422c945e162; affected 687aa0c5581b8d4aa87fd92973e4ee576b550cdf before a2a4346eea8b4cb75037dbcb20b98cb454324f80; affected 687aa0c5581b8d4aa87fd92973e4ee576b550cdf before f7c877e7535260cc7a21484c994e8ce7e8cb6780; affected 7b73bddf54777fb62d4d8c7729d0affe6df04477; affected 5.10.240 before 5.10.246; affected 5.15.189 before 5.15.196; affected 6.1.146 before 6.1.158; affected 6.6.99 before 6.6.115; affected 6.12.39 before 6.12.56; affected 6.15.7 before 6.16 |
| Linux / Linux | affected 6.16; unaffected 0 before 6.16; unaffected 5.10.246 through 5.10.*; unaffected 5.15.196 through 5.15.*; unaffected 6.1.158 through 6.1.*; unaffected 6.6.115 through 6.6.*; unaffected 6.12.56 through 6.12.*; unaffected 6.17.6 through 6.17.*; unaffected 6.18 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/ce4f856c64f0bc30e29302a0ce41f4295ca391c5
- https://git.kernel.org/stable/c/09bba278ccde25a14b6e5088a9e65a8717d0cccf
- https://git.kernel.org/stable/c/b44182c116778feaa05da52a426aeb9da1878dcf
- https://git.kernel.org/stable/c/42ed0784d11adebf748711e503af0eb9f1e6d81d
- https://git.kernel.org/stable/c/251caee792a21eb0b781aab91362b422c945e162
- https://git.kernel.org/stable/c/a2a4346eea8b4cb75037dbcb20b98cb454324f80
- https://git.kernel.org/stable/c/f7c877e7535260cc7a21484c994e8ce7e8cb6780