CVE-2026-72350
kernel: netfilter: xt_u32: reject invalid shift counts
Severity
LowRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · August 15, 2026
Updated · August 20, 2026
Description
A flaw was found in the Linux kernel's netfilter component, specifically in xt_u32. A local attacker with privileges to configure netfilter rules could craft a malicious u32 rule with an invalid shift count. This could lead to an undefined shift out-of-bounds during packet evaluation, potentially causing a denial of service (DoS) or system instability.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-1335 · Incorrect Bitwise Shift of Integer