CVE-2024-26665

Kernel fault via non-linear tunnel checksum

Published Apr 2, 2024 · Updated Aug 5, 2026

Out-of-bounds read in the Linux kernel allows local users to trigger a kernel fault while generating an IPv6 PMTU error. In skb_tunnel_check_pmtu, csum_partial reads a non-linear socket buffer as contiguous data even though it cannot handle fragmented SKBs. The path is reached during tunneled packet transmission, and kernel panic behavior depends on system configuration.

CVSS severity7.1
High
EPSS probability0.68%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in the Linux kernel allows local users to trigger a kernel fault while generating an IPv6 PMTU error. In skb_tunnel_check_pmtu, csum_partial reads a non-linear socket buffer as contiguous data even though it cannot handle fragmented SKBs. The path is reached during tunneled packet transmission, and kernel panic behavior depends on system configuration.

The record

CVE
CVE-2024-26665
Published
Apr 2, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 2, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=4cb47a8644cc9eb8ec81190a50e79e6530d0297f <510c869ffa4068c5f19ff4df51d1e2f3a30aaac1
  2. Affected versionversion=4cb47a8644cc9eb8ec81190a50e79e6530d0297f <7dc9feb8b1705cf00de20563b6bc4831f4c99dab
  3. Affected versionversion=4cb47a8644cc9eb8ec81190a50e79e6530d0297f <d75abeec401f8c86b470e7028a13fcdc87e5dd06
  4. Affected versionversion=4cb47a8644cc9eb8ec81190a50e79e6530d0297f <d964dd1bc1452594b4207d9229c157d9386e5d8a
  5. Affected versionversion=4cb47a8644cc9eb8ec81190a50e79e6530d0297f <e37cde7a5716466ff2a76f7f27f0a29b05b9a732
  6. Affected versionversion=4cb47a8644cc9eb8ec81190a50e79e6530d0297f <e77bf828f1ca1c47fcff58bdc26b60a9d3dfbe1d
  7. Affected versionversion=5.9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4cb47a8644cc9eb8ec81190a50e79e6530d0297f <510c869ffa4068c5f19ff4df51d1e2f3a30aaac1; version=4cb47a8644cc9eb8ec81190a50e79e6530d0297f <7dc9feb8b1705cf00de20563b6bc4831f4c99dab; version=4cb47a8644cc9eb8ec81190a50e79e6530d0297f <d75abeec401f8c86b470e7028a13fcdc87e5dd06; version=4cb47a8644cc9eb8ec81190a50e79e6530d0297f <d964dd1bc1452594b4207d9229c157d9386e5d8a; version=4cb47a8644cc9eb8ec81190a50e79e6530d0297f <e37cde7a5716466ff2a76f7f27f0a29b05b9a732; version=4cb47a8644cc9eb8ec81190a50e79e6530d0297f <e77bf828f1ca1c47fcff58bdc26b60a9d3dfbe1d; version=5.9

Published CVSS scores

7.1NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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-125Out-of-bounds Read
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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