CVE-2024-26746

Local kernel crash via unsafe completion-record copy

Published Apr 4, 2024 · Updated May 11, 2026

Improper usercopy handling in the Linux kernel allows local users to crash the kernel through an IDXD completion-record fault. The idxd_copy_cr path copies a completion record from an event-log SLUB cache created with kmem_cache_create(), which is not marked as safe for userspace copies. Reachability requires CONFIG_HARDENED_USERCOPY and an IDXD event-log completion-record copy; the observed result is a kernel BUG and service interruption.

CVSS severity5.5
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper usercopy handling in the Linux kernel allows local users to crash the kernel through an IDXD completion-record fault. The idxd_copy_cr path copies a completion record from an event-log SLUB cache created with kmem_cache_create(), which is not marked as safe for userspace copies. Reachability requires CONFIG_HARDENED_USERCOPY and an IDXD event-log completion-record copy; the observed result is a kernel BUG and service interruption.

The record

CVE
CVE-2024-26746
Published
Apr 4, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 4, 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=c2f156bf168fb42cd6ecd0a8e2204dbe542b8516 <5e3022ea42e490a36ec6f2cfa6fc603deb0bace4
  3. Affected versionversion=c2f156bf168fb42cd6ecd0a8e2204dbe542b8516 <bb71e040323175e18c233a9afef32ba14fa64eb7
  4. Affected versionversion=c2f156bf168fb42cd6ecd0a8e2204dbe542b8516 <d3ea125df37dc37972d581b74a5d3785c3f283ab

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.4; version=c2f156bf168fb42cd6ecd0a8e2204dbe542b8516 <5e3022ea42e490a36ec6f2cfa6fc603deb0bace4; version=c2f156bf168fb42cd6ecd0a8e2204dbe542b8516 <bb71e040323175e18c233a9afef32ba14fa64eb7; version=c2f156bf168fb42cd6ecd0a8e2204dbe542b8516 <d3ea125df37dc37972d581b74a5d3785c3f283ab

Published CVSS scores

5.5NVDCVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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

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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