ext4: regenerate buddy after block freeing failed if under fc replay

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Summary

CVECVE-2024-26601
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2024-02-26 16:27:59 UTC
Updated2026-08-04 11:16:47 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: ext4: regenerate buddy after block freeing failed if under fc replay This mostly reverts commit 6bd97bf273bd ("ext4: remove redundant mb_regenerate_buddy()") and reintroduces mb_regenerate_buddy(). Based on code in mb_free_blocks(), fast commit replay can end up marking as free blocks that are already marked as such. This causes corruption of the buddy bitmap so we need to regenerate it in that case.

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: NVD-CWE-noinfo

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 0983142c5f17a62055ec851372273c3bc77e4788 94ebf71bddbcd4ab1ce43ae32c6cb66396d2d51a git Not specified
CNA Linux Linux affected 6bd97bf273bdb4944904e57480f6545bca48ad77 c1317822e2de80e78f137d3a2d99febab1b80326 git Not specified
CNA Linux Linux affected 6bd97bf273bdb4944904e57480f6545bca48ad77 78327acd4cdc4a1601af718b781eece577b6b7d4 git Not specified
CNA Linux Linux affected 6bd97bf273bdb4944904e57480f6545bca48ad77 ea42d6cffb0dd27a417f410b9d0011e9859328cb git Not specified
CNA Linux Linux affected 6bd97bf273bdb4944904e57480f6545bca48ad77 6b0d48647935e4b8c7b75d1eccb9043fcd4ee581 git Not specified
CNA Linux Linux affected 6bd97bf273bdb4944904e57480f6545bca48ad77 c9b528c35795b711331ed36dc3dbee90d5812d4e git Not specified
CNA Linux Linux affected 5.10.181 5.10.211 semver Not specified
CNA Linux Linux affected 5.11 Not specified
CNA Linux Linux unaffected 5.11 semver Not specified
CNA Linux Linux unaffected 5.10.211 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.150 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.78 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.17 6.6.* semver Not specified
CNA Linux Linux unaffected 6.7.5 6.7.* semver Not specified
CNA Linux Linux unaffected 6.8 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/c1317822e2de80e78f137d3a2d99febab1b80326 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2024/06/msg00017.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org
git.kernel.org/stable/c/c9b528c35795b711331ed36dc3dbee90d5812d4e af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/94ebf71bddbcd4ab1ce43ae32c6cb66396d2d51a af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/78327acd4cdc4a1601af718b781eece577b6b7d4 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/6b0d48647935e4b8c7b75d1eccb9043fcd4ee581 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/ea42d6cffb0dd27a417f410b9d0011e9859328cb 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

  • 200182 Ubuntu Security Notification for Linux kernel (OEM) Vulnerabilities (USN-6688-1)
  • 357358 Amazon Linux Security Advisory for kernel : ALAS2KERNEL-5.10-2024-052
  • 357366 Amazon Linux Security Advisory for kernel : ALAS2KERNEL-5.15-2024-040
  • 6000567 Debian Security Update for linux (DSA 5658-1)
  • 6140450 AWS Bottlerocket Security Update for kernel (GHSA-v279-8m3x-vvcc)

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