openvswitch: validate MPLS set/set_masked payload length

Summary

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.

Timeline

1. Apr 25, 2026, 8:46 AM UTCCVE published
2. Oct 16, 2026, 3:12 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: partial

3. Oct 19, 2026, 6:56 PM UTCRecord last updated

Affected versions

• Linux Linux

  From fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 · fixed in 68f32ef0683c8d1c05cd2e4f16818fa63ff59c6f; From fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 · fixed in 4cae986225f8b8679ad86b924918e7d75a96aa61; From fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 · fixed in 8ed7b9930cbc3bc71f868fa79a68700ac88d586a; From fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 · fixed in c1f97152df8dfb17e855ddf0fc409b7bd13e9700; From fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 · fixed in 98de18d327ef8cbbb704980e359e4872d8c28997; From fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 · fixed in bd50c7484c3bb34097571c1334174fb8b7408036; From fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 · fixed in 2ca33b88a79ca42f017ae0f7011280325655438e; From fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 · fixed in 546b68ac893595877ffbd7751e5c55fd1c43ede6

• Linux Linux

  5.5

• KernelLinux

  From 5.5.0 · fixed in 5.10.253; From 5.11.0 · fixed in 5.15.203; From 5.16.0 · fixed in 6.1.168; From 6.2.0 · fixed in 6.6.131; From 6.7.0 · fixed in 6.12.80; From 6.13.0 · fixed in 6.18.21; From 6.19.0 · fixed in 6.19.11

References 8