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Linux KernelOperating system · Linux

CVE-2026-31679

HIGH · 7.1 CVSS v3.1 Published 2026-04-25
Fix available
A fix is available. Upgrade to 5.10.253 / 5.15.203 or later.
See remediation →
73/100
Remediation priority · Elevated
Zero-click Patch available

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
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.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis

A detailed technical summary for this CVE is being prepared.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Linux KernelOperating system
Affected:>= 5.5, < 5.10.253>= 5.11, < 5.15.203>= 5.16, < 6.1.168>= 6.2, < 6.6.131>= 6.7, < 6.12.80>= 6.13, < 6.18.21>= 6.19, < 6.19.11= 7.0

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 5.10.253 / 5.15.203 / 6.1.168 or later
Fixed in 5.10.2535.15.2036.1.168
Vendor patch git.kernel.org →
Recommended fix High confidence

Linux kernel 5.10.253+, 5.15.203+, 6.1.168+, or 6.6.131+ (depending on your current branch)

  1. 1. Identify the currently running Linux kernel version using `uname -r`
  2. 2. Determine which version range your current kernel falls into based on the affected ranges: >= 5.5 to < 5.10.253, >= 5.11 to < 5.15.203, >= 5.16 to < 6.1.168, or >= 6.2 to < 6.6.131
  3. 3. Plan an upgrade to a kernel version at or beyond the first fixed version in your range
  4. 4. For systems with kernel 5.10.x: upgrade to 5.10.253 or later (but less than 5.11)
  5. 5. For systems with kernel 5.11.x through 5.15.x: upgrade to 5.15.203 or later (but less than 5.16)
  6. 6. For systems with kernel 5.16.x through 6.1.x: upgrade to 6.1.168 or later (but less than 6.2)
  7. 7. For systems with kernel 6.2.x through 6.6.x: upgrade to 6.6.131 or later (or 6.7/6.8 stable)
  8. 8. Apply the upgrade via your distribution's package manager or compile from kernel.org sources
Caveat Kernel upgrades may require rebuild of third-party kernel modules; ensure compatible drivers are available before upgrading

Generated from the published advisory — verify against the referenced sources before acting.

We can perform the upgrade in your staging environment and verify nothing breaks — typical engagement from $1,950. Get the upgrade done

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-31679 in production — separate from our analysis above.

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data