CVE-2024-26674

Kernel panic via misclassified user-access fixups

Published Apr 2, 2024 · Updated May 11, 2026

Improper exception handling in Linux kernel 6.4 allows local users to panic the kernel during an in-kernel machine check. The x86 get_user() and put_user() exception tables classify user-memory fixups as EX_TYPE_DEFAULT, so machine-check handling panics instead of invoking the recoverable EX_TYPE_UACCESS path. Reachability requires a machine check during a kernel access to user memory; the demonstrated consequence is a host-wide crash.

CVSS severity7.1
High
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper exception handling in Linux kernel 6.4 allows local users to panic the kernel during an in-kernel machine check. The x86 get_user() and put_user() exception tables classify user-memory fixups as EX_TYPE_DEFAULT, so machine-check handling panics instead of invoking the recoverable EX_TYPE_UACCESS path. Reachability requires a machine check during a kernel access to user memory; the demonstrated consequence is a host-wide crash.

The record

CVE
CVE-2024-26674
Published
Apr 2, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-787, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 2, 2024CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=6.4
  2. Affected versionversion=b19b74bc99b1501a550f4448d04d59b946dc617a <2aed1b6c33afd8599d01c6532bbecb829480a674
  3. Affected versionversion=b19b74bc99b1501a550f4448d04d59b946dc617a <2da241c5ed78d0978228a1150735539fe1a60eca
  4. Affected versionversion=b19b74bc99b1501a550f4448d04d59b946dc617a <8eed4e00a370b37b4e5985ed983dccedd555ea9d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.4; version=b19b74bc99b1501a550f4448d04d59b946dc617a <2aed1b6c33afd8599d01c6532bbecb829480a674; version=b19b74bc99b1501a550f4448d04d59b946dc617a <2da241c5ed78d0978228a1150735539fe1a60eca; version=b19b74bc99b1501a550f4448d04d59b946dc617a <8eed4e00a370b37b4e5985ed983dccedd555ea9d

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-787Out-of-bounds Write
T1499.004Endpoint Denial of Service: Application 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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