CVE-2024-26718

Kernel memory corruption via tasklet use-after-free

Published Apr 3, 2024 · Updated Aug 5, 2026

Use-after-free in dm-crypt and dm-verity in Linux allows local users to corrupt kernel memory through tasklet-processed block I/O. tasklet_action_common invokes a callback that can free its containing object, then tasklet_unlock writes to that freed storage; dm-verity reaches this sequence for every tasklet-processed bio. Reachability requires an existing dm-crypt or dm-verity device using tasklet processing, and repeated I/O can crash the kernel or corrupt data.

CVSS severity7.8
High
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in dm-crypt and dm-verity in Linux allows local users to corrupt kernel memory through tasklet-processed block I/O. tasklet_action_common invokes a callback that can free its containing object, then tasklet_unlock writes to that freed storage; dm-verity reaches this sequence for every tasklet-processed bio. Reachability requires an existing dm-crypt or dm-verity device using tasklet processing, and repeated I/O can crash the kernel or corrupt data.

The record

CVE
CVE-2024-26718
Published
Apr 3, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-787
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 3, 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=39d42fa96ba1b7d2544db3f8ed5da8fb0d5cb877 <0a9bab391e336489169b95cb0d4553d921302189
  2. Affected versionversion=39d42fa96ba1b7d2544db3f8ed5da8fb0d5cb877 <0c45a20cbe68bc4d681734f5c03891124a274257
  3. Affected versionversion=39d42fa96ba1b7d2544db3f8ed5da8fb0d5cb877 <30884a44e0cedc3dfda8c22432f3ba4078ec2d94
  4. Affected versionversion=39d42fa96ba1b7d2544db3f8ed5da8fb0d5cb877 <5735a2671ffb70ea29ca83969fe01316ee2ed6fc
  5. Affected versionversion=39d42fa96ba1b7d2544db3f8ed5da8fb0d5cb877 <b825e0f9d68c178072bffd32dd34c39e3d2d597a
  6. Affected versionversion=5.9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=39d42fa96ba1b7d2544db3f8ed5da8fb0d5cb877 <0a9bab391e336489169b95cb0d4553d921302189; version=39d42fa96ba1b7d2544db3f8ed5da8fb0d5cb877 <0c45a20cbe68bc4d681734f5c03891124a274257; version=39d42fa96ba1b7d2544db3f8ed5da8fb0d5cb877 <30884a44e0cedc3dfda8c22432f3ba4078ec2d94; version=39d42fa96ba1b7d2544db3f8ed5da8fb0d5cb877 <5735a2671ffb70ea29ca83969fe01316ee2ed6fc; version=39d42fa96ba1b7d2544db3f8ed5da8fb0d5cb877 <b825e0f9d68c178072bffd32dd34c39e3d2d597a; version=5.9

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.8kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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

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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