SB20260812204 - Race condition in Linux kernel tipc

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-68323)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a race condition in tipc_udp_rcast_add() and cleanup_bearer() in net/tipc/udp_media.c when updating the udp bearer replicast list during peer discovery and bearer cleanup. A local user can enable a TIPC bearer from an unprivileged user namespace and trigger concurrent list updates to cause a denial of service.

The issue can corrupt the kernel list structure and trigger a kernel BUG during bearer cleanup.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/350e592ff4e30e48ffb55e142d11a73e63f4869c
• https://git.kernel.org/stable/c/d70c81001df9320d3445e664428a1d408b5ba896