Description
In the Linux kernel, the following vulnerability has been resolved:
net: kcm: Fix race condition in kcm_unattach()
syzbot found a race condition when kcm_unattach(psock) and kcm_release(kcm) are executed at the same time.
kcm_unattach() is missing a check of the flag kcm->tx_stopped before calling queue_work().
If the kcm has a reserved psock, kcm_unattach() might get executed between cancel_work_sync() and unreserve_psock() in kcm_release(), requeuing kcm->tx_work right before kcm gets freed in kcm_done().
Remove kcm->tx_stopped and replace it by the less error-prone disable_work_sync().
Metrics
CVSS 3.1 4.7/10
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= ab7ac4eb9832e32a09f4e8042705484d2fb0aad3, < c0bffbc92a1ca3960fb9cdb8e9f75a68468eb308; >= ab7ac4eb9832e32a09f4e8042705484d2fb0aad3, < 7275dc3bb8f91b23125ff3f47b6529935cf46152; >= ab7ac4eb9832e32a09f4e8042705484d2fb0aad3, < 798733ee5d5788b12e8a52db1519abc17e826f69; >= ab7ac4eb9832e32a09f4e8042705484d2fb0aad3, < 52565a935213cd6a8662ddb8efe5b4219343a25d |
| Linux | Linux | 4.6 |
References
- https://git.kernel.org/stable/c/52565a935213cd6a8662ddb8efe5b4219343a25dPatch
- https://git.kernel.org/stable/c/7275dc3bb8f91b23125ff3f47b6529935cf46152Patch
- https://git.kernel.org/stable/c/798733ee5d5788b12e8a52db1519abc17e826f69Patch
- https://git.kernel.org/stable/c/c0bffbc92a1ca3960fb9cdb8e9f75a68468eb308Patch
Timeline
- Published
- Sep 4, 2025
- Last modified
- Oct 19, 2026
- NVD status
- Modified