CVE-2026-43093

A flaw was found in the Linux kernel's xsk (AF_XDP) subsystem due to insufficient validation of the User Memory (UMEM) headroom. This vulnerability could lead to memory corruption, specifically the skb_shared_info data structure, if multi-buffer is enabled. Such corruption could result in system instability or a denial of service. Additionally, the flaw could cause insufficient space for minimum-sized Ethernet frames.

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