SB2026102399 - Use-after-free in Linux kernel tipc
Published: October 23, 2026
Security Bulletin ID
SB2026102399
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use-after-free (CVE-ID: CVE-2026-99054)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/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 use-after-free caused by a teardown race in the Linux kernel TIPC topology server when closing subscriber connections while send and receive workqueues are still running. A local user can exploit concurrent connection activity during topology server shutdown to cause kernel crashes or stalls.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/0af8780bdfdfc91fb9127bddb9c48fab67dc9d9e
- https://git.kernel.org/stable/c/3acdd44385bc7e2e57605e073691ce69cc5a960d
- https://git.kernel.org/stable/c/7f796bb3b440d7f1b14c0e3b520462eb34f553af
- https://git.kernel.org/stable/c/da9c16568bc79140a54c1f5fcf07a0305df47b37
- https://git.kernel.org/stable/c/fb717c536af2aafeca520ff11d1e0f25f7ab8fa9