ext4: fix timer use-after-free on failed mount

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Summary

CVECVE-2024-49960
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2024-10-21 18:15:17 UTC
Updated2026-06-15 18:23:18 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: ext4: fix timer use-after-free on failed mount Syzbot has found an ODEBUG bug in ext4_fill_super The del_timer_sync function cancels the s_err_report timer, which reminds about filesystem errors daily. We should guarantee the timer is no longer active before kfree(sbi). When filesystem mounting fails, the flow goes to failed_mount3, where an error occurs when ext4_stop_mmpd is called, causing a read I/O failure. This triggers the ext4_handle_error function that ultimately re-arms the timer, leaving the s_err_report timer active before kfree(sbi) is called. Fix the issue by canceling the s_err_report timer after calling ext4_stop_mmpd.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

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

Problem Types: CWE-416

CVSS v3.1 Breakdown

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

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Debian Debian Linux 11.0 All All All
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 5e4f5138bd8522ebe231a137682d3857209a2c07 7aac0c17a8cdf4a3236991c1e60435c6a984076c git Not specified
CNA Linux Linux affected 618f003199c6188e01472b03cdbba227f1dc5f24 22e9b83f0f33bc5a7a3181769d1dccbf021f5b04 git Not specified
CNA Linux Linux affected 618f003199c6188e01472b03cdbba227f1dc5f24 cf3196e5e2f36cd80dab91ffae402e13935724bc git Not specified
CNA Linux Linux affected 618f003199c6188e01472b03cdbba227f1dc5f24 9203817ba46ebba7c865c8de2aba399537b6e891 git Not specified
CNA Linux Linux affected 618f003199c6188e01472b03cdbba227f1dc5f24 fa78fb51d396f4f2f80f8e96a3b1516f394258be git Not specified
CNA Linux Linux affected 618f003199c6188e01472b03cdbba227f1dc5f24 b85569585d0154d4db1e4f9e3e6a4731d407feb0 git Not specified
CNA Linux Linux affected 618f003199c6188e01472b03cdbba227f1dc5f24 0ce160c5bdb67081a62293028dc85758a8efb22a git Not specified
CNA Linux Linux affected cecfdb9cf9a700d1037066173abac0617f6788df git Not specified
CNA Linux Linux affected eb7b40d9d3785f7a131fb0b1f89bb6efa46c1833 git Not specified
CNA Linux Linux affected 5.10.51 5.10.237 semver Not specified
CNA Linux Linux affected 5.12.18 5.13 semver Not specified
CNA Linux Linux affected 5.13.3 5.14 semver Not specified
CNA Linux Linux affected 5.14 Not specified
CNA Linux Linux unaffected 5.14 semver Not specified
CNA Linux Linux unaffected 5.10.237 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.181 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.118 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.55 6.6.* semver Not specified
CNA Linux Linux unaffected 6.10.14 6.10.* semver Not specified
CNA Linux Linux unaffected 6.11.3 6.11.* semver Not specified
CNA Linux Linux unaffected 6.12 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
lists.debian.org/debian-lts-announce/2025/05/msg00030.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List, Third Party Advisory
git.kernel.org/stable/c/cf3196e5e2f36cd80dab91ffae402e13935724bc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/7aac0c17a8cdf4a3236991c1e60435c6a984076c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/0ce160c5bdb67081a62293028dc85758a8efb22a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/9203817ba46ebba7c865c8de2aba399537b6e891 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/22e9b83f0f33bc5a7a3181769d1dccbf021f5b04 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/fa78fb51d396f4f2f80f8e96a3b1516f394258be 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/b85569585d0154d4db1e4f9e3e6a4731d407feb0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2025/01/msg00001.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List, Third Party Advisory
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