CVE-2024-26703

Kernel crash via uninitialized timerlat hrtimer cancellation

Published Apr 3, 2024 · Updated May 11, 2026

Denial of service in the Linux kernel allows local users to trigger a kernel oops by closing an unread timerlat_fd tracing file. timerlat_fd_release cancels an hrtimer that was initialized only on first read, so closing the descriptor before reading dereferences an uninitialized timer pointer. Access to the timerlat tracing interface is required, and successful triggering interrupts kernel service without reported data disclosure or modification.

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

Denial of service in the Linux kernel allows local users to trigger a kernel oops by closing an unread timerlat_fd tracing file. timerlat_fd_release cancels an hrtimer that was initialized only on first read, so closing the descriptor before reading dereferences an uninitialized timer pointer. Access to the timerlat tracing interface is required, and successful triggering interrupts kernel service without reported data disclosure or modification.

The record

CVE
CVE-2024-26703
Published
Apr 3, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 3, 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=6.5
  2. Affected versionversion=e88ed227f639ebcb31ed4e5b88756b47d904584b <1389358bb008e7625942846e9f03554319b7fecc
  3. Affected versionversion=e88ed227f639ebcb31ed4e5b88756b47d904584b <2354d29986ebd138f89c2b73fecf8237e0a4ad6b
  4. Affected versionversion=e88ed227f639ebcb31ed4e5b88756b47d904584b <5f703935fdb559642d85b2088442ee55a557ae6d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.5; version=e88ed227f639ebcb31ed4e5b88756b47d904584b <1389358bb008e7625942846e9f03554319b7fecc; version=e88ed227f639ebcb31ed4e5b88756b47d904584b <2354d29986ebd138f89c2b73fecf8237e0a4ad6b; version=e88ed227f639ebcb31ed4e5b88756b47d904584b <5f703935fdb559642d85b2088442ee55a557ae6d

Published CVSS scores

5.5CanonicalCVSS: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

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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