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Description

In 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 We should guarantee the timer is no longer active before kfree(sbi).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.

PUBLISHED Reserved 2024-10-21 | Published 2024-10-21 | Updated 2025-11-03 | Assigner Linux

Product status

Default status
unaffected

5e4f5138bd8522ebe231a137682d3857209a2c07 (git) before 7aac0c17a8cdf4a3236991c1e60435c6a984076c
affected

618f003199c6188e01472b03cdbba227f1dc5f24 (git) before 22e9b83f0f33bc5a7a3181769d1dccbf021f5b04
affected

618f003199c6188e01472b03cdbba227f1dc5f24 (git) before cf3196e5e2f36cd80dab91ffae402e13935724bc
affected

618f003199c6188e01472b03cdbba227f1dc5f24 (git) before 9203817ba46ebba7c865c8de2aba399537b6e891
affected

618f003199c6188e01472b03cdbba227f1dc5f24 (git) before fa78fb51d396f4f2f80f8e96a3b1516f394258be
affected

618f003199c6188e01472b03cdbba227f1dc5f24 (git) before b85569585d0154d4db1e4f9e3e6a4731d407feb0
affected

618f003199c6188e01472b03cdbba227f1dc5f24 (git) before 0ce160c5bdb67081a62293028dc85758a8efb22a
affected

cecfdb9cf9a700d1037066173abac0617f6788df (git)
affected

eb7b40d9d3785f7a131fb0b1f89bb6efa46c1833 (git)
affected

Default status
affected

5.14
affected

Any version before 5.14
unaffected

5.10.237 (semver)
unaffected

5.15.181 (semver)
unaffected

6.1.118 (semver)
unaffected

6.6.55 (semver)
unaffected

6.10.14 (semver)
unaffected

6.11.3 (semver)
unaffected

6.12 (original_commit_for_fix)
unaffected

References

lists.debian.org/debian-lts-announce/2025/05/msg00030.html

lists.debian.org/debian-lts-announce/2025/01/msg00001.html

git.kernel.org/...c/7aac0c17a8cdf4a3236991c1e60435c6a984076c

git.kernel.org/...c/22e9b83f0f33bc5a7a3181769d1dccbf021f5b04

git.kernel.org/...c/cf3196e5e2f36cd80dab91ffae402e13935724bc

git.kernel.org/...c/9203817ba46ebba7c865c8de2aba399537b6e891

git.kernel.org/...c/fa78fb51d396f4f2f80f8e96a3b1516f394258be

git.kernel.org/...c/b85569585d0154d4db1e4f9e3e6a4731d407feb0

git.kernel.org/...c/0ce160c5bdb67081a62293028dc85758a8efb22a

cve.org (CVE-2024-49960)

nvd.nist.gov (CVE-2024-49960)

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Data based on CVE®. Copyright © 1999-2025, The MITRE Corporation. All rights reserved.