CVE-2026-72347

A flaw was found in the Linux kernel's netfilter xt_connmark module. This vulnerability occurs because the CONNMARK target, specifically revision 2, accepts user-controlled shift parameters without proper validation. An attacker with the ability to create netfilter rules could provide a shift_bits value of 32 or more, triggering an undefined-shift bug. This could lead to undefined behavior, potentially causing system instability or a denial of service.

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.