CVE-2026-43099

A flaw was found in the Linux kernel, specifically within the IPv4 (Internet Protocol version 4) and ICMP (Internet Control Message Protocol) components. When the IPv6 (Internet Protocol version 6) stack is not active, a specific function (ipv6_dev_find) can return an error. If this error is then passed to another function (dev_hold), it leads to a null pointer dereference, causing the kernel to crash. This vulnerability could result in a Denial of Service (DoS) for the affected system.

Red Hat acknowledges the upstream Linux kernel correction for «ipv4» 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.