SB20260727164 - Improper input validation in Linux kernel bridge netfilter
Published: July 27, 2026
Security Bulletin ID
SB20260727164
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) Improper input validation (CVE-ID: CVE-2026-64412)
CWE-ID: CWE-20 - Improper input validation
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 improper input validation in the ebtables match handling code in net/bridge/netfilter/ebtables.c when processing a crafted module name. A local user can supply a non-null-terminated module name to cause a denial of service.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/084d23f818321390509e9738a0b08bbf46df6425
- https://git.kernel.org/stable/c/0ddca0f90fa3395111d078ae4399615cf3ea94aa
- https://git.kernel.org/stable/c/13a5f532e3a4fc75c33060a026def1572c208643
- https://git.kernel.org/stable/c/43dd2332b8a27b3ac5108791680cade654ab0f96
- https://git.kernel.org/stable/c/5777c8f1c3610786d8482b8f620f40fccaf1542b
- https://git.kernel.org/stable/c/7b217960e88b5d2d1e8cdcbcaf3bdf6fe199a0c8
- https://git.kernel.org/stable/c/d2367d99f2455f373996d9ddbe833dbe9f942213
- https://git.kernel.org/stable/c/da32e78bbb187ed7b137e0007034185570a3a172