dm-crypt, dm-verity: disable tasklets

MITRE NVD CVE.ORG JSON API Print: PDF PDF

Summary

CVECVE-2024-26718
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2024-04-03 15:15:53 UTC
Updated2026-08-04 11:16:58 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: dm-crypt, dm-verity: disable tasklets Tasklets have an inherent problem with memory corruption. The function tasklet_action_common calls tasklet_trylock, then it calls the tasklet callback and then it calls tasklet_unlock. If the tasklet callback frees the structure that contains the tasklet or if it calls some code that may free it, tasklet_unlock will write into free memory. The commits 8e14f610159d and d9a02e016aaf try to fix it for dm-crypt, but it is not a sufficient fix and the data corruption can still happen [1]. There is no fix for dm-verity and dm-verity will write into free memory with every tasklet-processed bio. There will be atomic workqueues implemented in the kernel 6.9 [2]. They will have better interface and they will not suffer from the memory corruption problem. But we need something that stops the memory corruption now and that can be backported to the stable kernels. So, I'm proposing this commit that disables tasklets in both dm-crypt and dm-verity. This commit doesn't remove the tasklet support, because the tasklet code will be reused when atomic workqueues will be implemented. [1] https://lore.kernel.org/all/[email protected]/T/ [2] https://lore.kernel.org/lkml/[email protected]/

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-787

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 39d42fa96ba1b7d2544db3f8ed5da8fb0d5cb877 b825e0f9d68c178072bffd32dd34c39e3d2d597a git Not specified
CNA Linux Linux affected 39d42fa96ba1b7d2544db3f8ed5da8fb0d5cb877 30884a44e0cedc3dfda8c22432f3ba4078ec2d94 git Not specified
CNA Linux Linux affected 39d42fa96ba1b7d2544db3f8ed5da8fb0d5cb877 5735a2671ffb70ea29ca83969fe01316ee2ed6fc git Not specified
CNA Linux Linux affected 39d42fa96ba1b7d2544db3f8ed5da8fb0d5cb877 0c45a20cbe68bc4d681734f5c03891124a274257 git Not specified
CNA Linux Linux affected 39d42fa96ba1b7d2544db3f8ed5da8fb0d5cb877 0a9bab391e336489169b95cb0d4553d921302189 git Not specified
CNA Linux Linux affected 5.9 Not specified
CNA Linux Linux unaffected 5.9 semver Not specified
CNA Linux Linux unaffected 5.15.169 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.79 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.18 6.6.* semver Not specified
CNA Linux Linux unaffected 6.7.6 6.7.* semver Not specified
CNA Linux Linux unaffected 6.8 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
dm-crypt, dm-verity: disable tasklets - kernel/git/stable/linux.git - Linux kernel stable tree af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
dm-crypt, dm-verity: disable tasklets - kernel/git/stable/linux.git - Linux kernel stable tree af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
dm-crypt, dm-verity: disable tasklets - kernel/git/stable/linux.git - Linux kernel stable tree af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/b825e0f9d68c178072bffd32dd34c39e3d2d597a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
dm-crypt, dm-verity: disable tasklets - kernel/git/stable/linux.git - Linux kernel stable tree af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 6000567 Debian Security Update for linux (DSA 5658-1)

© CVE.report 2026

Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. It is the responsibility of user to evaluate the accuracy, completeness or usefulness of any information, opinion, advice or other content. EACH USER WILL BE SOLELY RESPONSIBLE FOR ANY consequences of his or her direct or indirect use of this web site. ALL WARRANTIES OF ANY KIND ARE EXPRESSLY DISCLAIMED. This site will NOT BE LIABLE FOR ANY DIRECT, INDIRECT or any other kind of loss.

CVE, CWE, and OVAL are registred trademarks of The MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. This site includes MITRE data granted under the following license.

Free CVE JSON API cve.report/api

CVE.report and Source URL Uptime Status status.cve.report