CVE-2026-31679

Description

In the Linux kernel, the following vulnerability has been resolved: openvswitch: validate MPLS set/set_masked payload length validate_set() accepted OVS_KEY_ATTR_MPLS as variable-sized payload for SET/SET_MASKED actions. In action handling, OVS expects fixed-size MPLS key data (struct ovs_key_mpls). Use the already normalized key_len (masked case included) and reject non-matching MPLS action key sizes. Reject invalid MPLS action payload lengths early.

References

• https://git.kernel.org/stable/c/2ca33b88a79ca42f017ae0f7011280325655438e
• https://git.kernel.org/stable/c/4cae986225f8b8679ad86b924918e7d75a96aa61
• https://git.kernel.org/stable/c/546b68ac893595877ffbd7751e5c55fd1c43ede6
• https://git.kernel.org/stable/c/68f32ef0683c8d1c05cd2e4f16818fa63ff59c6f
• https://git.kernel.org/stable/c/8ed7b9930cbc3bc71f868fa79a68700ac88d586a