SB20260828143 - NULL pointer dereference in Linux kernel netfilter
Published: August 28, 2026
Security Bulletin ID
SB20260828143
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) NULL pointer dereference (CVE-ID: CVE-2026-80636)
CWE-ID: CWE-476 - NULL Pointer Dereference
CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to a null pointer dereference in conntrack extension handling in netfilter when processing unconfirmed conntracks. A remote attacker can trigger code paths that dereference a missing conntrack extension to cause a denial of service.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/35e21a4dccc5c255ba59ccfbfeb4629ed21da972
- https://git.kernel.org/stable/c/61eab1d0237eb513fe73e391a5926ee70092c325
- https://git.kernel.org/stable/c/6bba4846f196d081bf553391d12b5a73dcc48685
- https://git.kernel.org/stable/c/a052a94bcc629acaecc2ce42a4af77f8fa399757
- https://git.kernel.org/stable/c/d53eecbca16f056abba274075cb15120ab062518