CVE-2025-40231

vsock: fix lock inversion in vsock_assign_transport()

Not available

At a glance

Source
NVD
EPSS
EPSS 0.21 % · percentile 11 ()
State
PUBLISHED
Published
Updated
Assigner
Linux
NVD status
Deferred

Description

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

European references

CERT-FR advisories

Affected products

ProductVersions
Linux · Linuxaffected 8667e8d0eb46bc54fdae30ba2f4786407d3d88eb < ce4f856c64f0bc30e29302a0ce41f4295ca391c5 ; affected 36a439049b34cca0b3661276049b84a1f76cc21a < 09bba278ccde25a14b6e5088a9e65a8717d0cccf ; affected 9ce53e744f18e73059d3124070e960f3aa9902bf < b44182c116778feaa05da52a426aeb9da1878dcf ; affected 9d24bb6780282b0255b9929abe5e8f98007e2c6e < 42ed0784d11adebf748711e503af0eb9f1e6d81d ; affected ae2c712ba39c7007de63cb0c75b51ce1caaf1da5 < 251caee792a21eb0b781aab91362b422c945e162 ; affected 687aa0c5581b8d4aa87fd92973e4ee576b550cdf < a2a4346eea8b4cb75037dbcb20b98cb454324f80
Linux · Linuxaffected 6.16 ; unaffected 0 < 6.16 ; unaffected 5.10.246 ≤ 5.10.* ; unaffected 5.15.196 ≤ 5.15.* ; unaffected 6.1.158 ≤ 6.1.* ; unaffected 6.6.115 ≤ 6.6.*

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD