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 We should guarantee the timer is no longer active before kfree(sbi).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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
5e4f5138bd8522ebe231a137682d3857209a2c07 to < 7aac0c17a8cdf4a3236991c1e60435c6a984076caffected618f003199c6188e01472b03cdbba227f1dc5f24 to < 22e9b83f0f33bc5a7a3181769d1dccbf021f5b04affected618f003199c6188e01472b03cdbba227f1dc5f24 to < cf3196e5e2f36cd80dab91ffae402e13935724bcaffected618f003199c6188e01472b03cdbba227f1dc5f24 to < 9203817ba46ebba7c865c8de2aba399537b6e891affected618f003199c6188e01472b03cdbba227f1dc5f24 to < fa78fb51d396f4f2f80f8e96a3b1516f394258beaffected618f003199c6188e01472b03cdbba227f1dc5f24 to < b85569585d0154d4db1e4f9e3e6a4731d407feb0affected618f003199c6188e01472b03cdbba227f1dc5f24 to < 0ce160c5bdb67081a62293028dc85758a8efb22aaffectedcecfdb9cf9a700d1037066173abac0617f6788dfaffectedeb7b40d9d3785f7a131fb0b1f89bb6efa46c1833affected5.10.51 to < 5.10.237affected5.12.18 to < 5.13affected5.13.3 to < 5.14affected
Linux Linux
Default version status: affected
5.14affected0 to < 5.14unaffected5.10.237 to ≤ 5.10.*unaffected5.15.181 to ≤ 5.15.*unaffected6.1.118 to ≤ 6.1.*unaffected6.6.55 to ≤ 6.6.*unaffected6.10.14 to ≤ 6.10.*unaffected6.11.3 to ≤ 6.11.*unaffected6.12 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/7aac0c17a8cdf4a3236991c1e60435c6a984076c ↗
- https://git.kernel.org/stable/c/22e9b83f0f33bc5a7a3181769d1dccbf021f5b04 ↗
- https://git.kernel.org/stable/c/cf3196e5e2f36cd80dab91ffae402e13935724bc ↗
- https://git.kernel.org/stable/c/9203817ba46ebba7c865c8de2aba399537b6e891 ↗
- https://git.kernel.org/stable/c/fa78fb51d396f4f2f80f8e96a3b1516f394258be ↗
- https://git.kernel.org/stable/c/b85569585d0154d4db1e4f9e3e6a4731d407feb0 ↗
- https://git.kernel.org/stable/c/0ce160c5bdb67081a62293028dc85758a8efb22a ↗
- https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html ↗
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html ↗