CVE-2026-31517

Kernel crash via non-linear IP-TFS reassembly

Published Apr 22, 2026 · Updated Apr 22, 2026

Denial of service in Linux Kernel 6.14, 6.14.1 through 6.18.20, and 6.19 through 6.19.10 allows local users to trigger a kernel panic. iptfs_reassem_cont() makes newskb non-linear through its zero-copy path, then passes it to skb_put() when a later fragment requires copying, triggering SKB_LINEAR_ASSERT. Low-privilege local access and IP-TFS reassembly of fragments with mixed fast-path eligibility are required; the consequence is a host-wide 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

Denial of service in Linux Kernel 6.14, 6.14.1 through 6.18.20, and 6.19 through 6.19.10 allows local users to trigger a kernel panic. iptfs_reassem_cont() makes newskb non-linear through its zero-copy path, then passes it to skb_put() when a later fragment requires copying, triggering SKB_LINEAR_ASSERT. Low-privilege local access and IP-TFS reassembly of fragments with mixed fast-path eligibility are required; the consequence is a host-wide crash.

The record

CVE
CVE-2026-31517
Published
Apr 22, 2026
Updated
Apr 22, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-401, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 22, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=5f2b6a9095743a6bf1f34c43c4fe78fa8bdf5ad7 <0b352f83cabfefdaafa806d6471f0eca117dc7d5
  2. Affected versionversion=5f2b6a9095743a6bf1f34c43c4fe78fa8bdf5ad7 <33a7b36268933c75bdc355e5531951e0ea9f1951
  3. Affected versionversion=5f2b6a9095743a6bf1f34c43c4fe78fa8bdf5ad7 <7fdfe8f6efeb0e1200e22a903f2471539f54522b
  4. Affected versionversion=6.14

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5f2b6a9095743a6bf1f34c43c4fe78fa8bdf5ad7 <0b352f83cabfefdaafa806d6471f0eca117dc7d5; version=5f2b6a9095743a6bf1f34c43c4fe78fa8bdf5ad7 <33a7b36268933c75bdc355e5531951e0ea9f1951; version=5f2b6a9095743a6bf1f34c43c4fe78fa8bdf5ad7 <7fdfe8f6efeb0e1200e22a903f2471539f54522b; version=6.14

Published CVSS scores

5.5UbuntuCVSS: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

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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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-401Missing Release of Memory after Effective Lifetime
T1499.004Application or System Exploitation

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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