SB2026040307 - Use-after-free in Linux kernel netfilter
Published: April 3, 2026
Security Bulletin ID
SB2026040307
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-2026-23412)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 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/E:U/U:Clear
The vulnerability allows a local attacker to cause a denial of service.
The vulnerability exists due to use-after-free in nfnl_hook_dump_one when dumping hooks via nfnetlink_hooks during concurrent access. A local attacker can trigger concurrent hook dump activity to cause a denial of service.
The issue is triggered by a race condition involving concurrent readers and may lead to a kernel crash.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/24f90fa3994b992d1a09003a3db2599330a5232a
- https://git.kernel.org/stable/c/54244d54a971c26a0cd0a9073460ff71f3c51b32
- https://git.kernel.org/stable/c/c25e0dec366ae99b7264324ce3c7cbaea34691f9
- https://git.kernel.org/stable/c/cb2bf5efdb02a2a59faf603604a1066e8266f349
- https://git.kernel.org/stable/c/d016c216bc75c45128160593a77b864a04dbe7c0