CVE-2025-38717

Summary

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().

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxab7ac4eb9832e32a09f4e8042705484d2fb0aad3 < c0bffbc92a1ca3960fb9cdb8e9f75a68468eb308affected
LinuxLinuxab7ac4eb9832e32a09f4e8042705484d2fb0aad3 < 7275dc3bb8f91b23125ff3f47b6529935cf46152affected
LinuxLinuxab7ac4eb9832e32a09f4e8042705484d2fb0aad3 < 798733ee5d5788b12e8a52db1519abc17e826f69affected
LinuxLinuxab7ac4eb9832e32a09f4e8042705484d2fb0aad3 < 52565a935213cd6a8662ddb8efe5b4219343a25daffected
LinuxLinux4.6affected
LinuxLinux0 < 4.6unaffected
LinuxLinux6.12.43 <= 6.12.*unaffected
LinuxLinux6.15.11 <= 6.15.*unaffected
LinuxLinux6.16.2 <= 6.16.*unaffected
LinuxLinux6.17 <= *unaffected

Weaknesses

References