CVE-2026-31424

Local kernel panic via ARP hook mismatch

Published Apr 13, 2026 · Updated Apr 13, 2026

NULL pointer dereference in Linux Kernel allows local users to trigger a kernel panic through crafted ARP nftables chains. The x_tables hook validator interprets NF_INET hook bits for ARP, so NFPROTO_UNSPEC matches pass validation despite incompatible ARP hook semantics and dereference a missing input device. Reachability requires local low-privileged access and an ARP chain using an incompatible extension; the bounded consequence is a host crash.

CVSS severity5.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in Linux Kernel allows local users to trigger a kernel panic through crafted ARP nftables chains. The x_tables hook validator interprets NF_INET hook bits for ARP, so NFPROTO_UNSPEC matches pass validation despite incompatible ARP hook semantics and dereference a missing input device. Reachability requires local low-privileged access and an ARP chain using an incompatible extension; the bounded consequence is a host crash.

The record

CVE
CVE-2026-31424
Published
Apr 13, 2026
Updated
Apr 13, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.6.39
  2. Affected versionversion=9291747f118d6404e509747b85ff5f6dfec368d2 <1cd6313c8644bfebbd813a05da9daa21b09dd68c
  3. Affected versionversion=9291747f118d6404e509747b85ff5f6dfec368d2 <3d5d488f11776738deab9da336038add95d342d1
  4. Affected versionversion=9291747f118d6404e509747b85ff5f6dfec368d2 <3e79374b03bf9a2f282f0eb1d0ac3776f7e0f28a
  5. Affected versionversion=9291747f118d6404e509747b85ff5f6dfec368d2 <dc3e27dd7d76e21106b8f9bbdc31f5da74a89014
  6. Affected versionversion=9291747f118d6404e509747b85ff5f6dfec368d2 <e7e1b6bcb389c8708003d40613a59ff2496f6b1f
  7. Affected versionversion=9291747f118d6404e509747b85ff5f6dfec368d2 <f00ac65c90ea475719e08d629e2e26c8b4e6999b

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=2.6.39; version=9291747f118d6404e509747b85ff5f6dfec368d2 <1cd6313c8644bfebbd813a05da9daa21b09dd68c; version=9291747f118d6404e509747b85ff5f6dfec368d2 <3d5d488f11776738deab9da336038add95d342d1; version=9291747f118d6404e509747b85ff5f6dfec368d2 <3e79374b03bf9a2f282f0eb1d0ac3776f7e0f28a; version=9291747f118d6404e509747b85ff5f6dfec368d2 <dc3e27dd7d76e21106b8f9bbdc31f5da74a89014; version=9291747f118d6404e509747b85ff5f6dfec368d2 <e7e1b6bcb389c8708003d40613a59ff2496f6b1f; version=9291747f118d6404e509747b85ff5f6dfec368d2 <f00ac65c90ea475719e08d629e2e26c8b4e6999b

Published CVSS scores

5.5Canonical UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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