CVE-2026-31679

openvswitch: validate MPLS set/set_masked payload length

State: Published
Severity: 7.1 High
Published: Apr 25, 2026
Updated: Oct 19, 2026
Reserved: Mar 9, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.1 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H	Linux

Weaknesses

CWE-20 Improper Input Validation

Affected Products

Product	Versions
LinuxLinux	fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 to before 68f32ef0683c8d1c05cd2e4f16818fa63ff59c6fAffected fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 to before 4cae986225f8b8679ad86b924918e7d75a96aa61Affected fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 to before 8ed7b9930cbc3bc71f868fa79a68700ac88d586aAffected fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 to before c1f97152df8dfb17e855ddf0fc409b7bd13e9700Affected fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 to before 98de18d327ef8cbbb704980e359e4872d8c28997Affected fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 to before bd50c7484c3bb34097571c1334174fb8b7408036Affected fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 to before 2ca33b88a79ca42f017ae0f7011280325655438eAffected fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 to before 546b68ac893595877ffbd7751e5c55fd1c43ede6Affected
LinuxLinux	5.5Affected before 5.5Not affected 5.10.253 through 5.10.Not affected 5.15.203 through 5.15.Not affected 6.1.168 through 6.1.Not affected 6.6.131 through 6.6.Not affected 6.12.80 through 6.12.Not affected 6.18.21 through 6.18.Not affected 6.19.11 through 6.19.*Not affected 7.0 and laterNot affected

Product

Versions

LinuxLinux

fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 to before 68f32ef0683c8d1c05cd2e4f16818fa63ff59c6fAffected
fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 to before 4cae986225f8b8679ad86b924918e7d75a96aa61Affected
fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 to before 8ed7b9930cbc3bc71f868fa79a68700ac88d586aAffected
fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 to before c1f97152df8dfb17e855ddf0fc409b7bd13e9700Affected
fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 to before 98de18d327ef8cbbb704980e359e4872d8c28997Affected
fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 to before bd50c7484c3bb34097571c1334174fb8b7408036Affected
fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 to before 2ca33b88a79ca42f017ae0f7011280325655438eAffected
fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 to before 546b68ac893595877ffbd7751e5c55fd1c43ede6Affected

LinuxLinux

5.5Affected
before 5.5Not affected
5.10.253 through 5.10.*Not affected
5.15.203 through 5.15.*Not affected
6.1.168 through 6.1.*Not affected
6.6.131 through 6.6.*Not affected
6.12.80 through 6.12.*Not affected
6.18.21 through 6.18.*Not affected
6.19.11 through 6.19.*Not affected
7.0 and laterNot affected

References

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.