SB2026081626 - Incorrect Bitwise Shift of Integer in Linux kernel netfilter
Published: August 16, 2026
Security Bulletin ID
SB2026081626
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) Incorrect Bitwise Shift of Integer (CVE-ID: CVE-2026-72350)
CWE-ID: CWE-1335 - Incorrect Bitwise Shift of Integer
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 an out-of-bounds shift operation in u32_match_it() in the xt_u32 netfilter match when evaluating a malformed u32 rule during packet processing. A local user can supply a crafted u32 rule with a shift count of 32 or more to cause a denial of service.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/00d034fe8230dfc5832fe011ff2d81c1a2cc7a29
- https://git.kernel.org/stable/c/0a8b7a6d763775709c601f584e709ae48bcc000a
- https://git.kernel.org/stable/c/64cdf7d30ac18e43df6c48004435febb965809a8
- https://git.kernel.org/stable/c/728f479dc0447ae7eaef87926ff49142e415a811
- https://git.kernel.org/stable/c/a597a722fb71a534138c20359b655726622b5f17
- https://git.kernel.org/stable/c/b33b44250d57ab0e5a1e2571b5285fb0d0a7f382
- https://git.kernel.org/stable/c/ca7c92d9701249e6daf132087756a88cbf2bb2a3
- https://git.kernel.org/stable/c/cce42014415cecd98aa49b3950e7b02ee7c81268