CVE-2026-31679
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.12%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.1 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
- EPSS
- 0.12% probability · 2th percentile
- CISA KEV
- Not listed
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/2ca33b88a79ca42f017ae0f7011280325655438ePatch
- https://git.kernel.org/stable/c/4cae986225f8b8679ad86b924918e7d75a96aa61Patch
- https://git.kernel.org/stable/c/546b68ac893595877ffbd7751e5c55fd1c43ede6Patch
- https://git.kernel.org/stable/c/68f32ef0683c8d1c05cd2e4f16818fa63ff59c6fPatch
- https://git.kernel.org/stable/c/8ed7b9930cbc3bc71f868fa79a68700ac88d586aPatch
- https://git.kernel.org/stable/c/98de18d327ef8cbbb704980e359e4872d8c28997Patch
- https://git.kernel.org/stable/c/bd50c7484c3bb34097571c1334174fb8b7408036Patch
- https://git.kernel.org/stable/c/c1f97152df8dfb17e855ddf0fc409b7bd13e9700Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.