CVE-2026-43238

A flaw was found in the Linux kernel. A divide-by-zero vulnerability exists in the tcf_skbedit_hash() function within the networking scheduler component. This occurs when calculating the mapping_mod value, where a large range wraps to zero, leading to a division by zero error. This flaw can cause a system crash, resulting in a Denial of Service (DoS).

Red Hat acknowledges the upstream Linux kernel correction for «net/sched» as described in COMMENT_ZERO. Fixes are delivered through standard kernel errata for supported products. Operational exposure depends on whether this subsystem or driver is active in your configuration.

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.

To mitigate this issue, prevent the act_skbedit module from being loaded. See https://access.redhat.com/solutions/41278 for instructions.