CVE-2026-31679

A flaw was found in the Linux kernel's openvswitch component. This vulnerability arises from improper validation of Multiprotocol Label Switching (MPLS) payload lengths during SET/SET_MASKED actions. An attacker could potentially exploit this by providing malformed MPLS key data, leading to unexpected behavior or a denial of service (DoS) condition within the kernel.

OVS MPLS set/masked actions now validate payload lengths before memcpy, closing OOB setup paths. Red Hat advises OVS dataplane deployments to patch promptly.

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 openvswitch module from being loaded. See https://access.redhat.com/solutions/41278 for instructions.