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 We should guarantee the timer is no longer active before kfree(sbi).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.
Metrics
CVSS 3.1 7.8/10
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= 5e4f5138bd8522ebe231a137682d3857209a2c07, < 7aac0c17a8cdf4a3236991c1e60435c6a984076c; >= 618f003199c6188e01472b03cdbba227f1dc5f24, < 22e9b83f0f33bc5a7a3181769d1dccbf021f5b04; >= 618f003199c6188e01472b03cdbba227f1dc5f24, < cf3196e5e2f36cd80dab91ffae402e13935724bc; >= 618f003199c6188e01472b03cdbba227f1dc5f24, < 9203817ba46ebba7c865c8de2aba399537b6e891; >= 618f003199c6188e01472b03cdbba227f1dc5f24, < fa78fb51d396f4f2f80f8e96a3b1516f394258be; >= 618f003199c6188e01472b03cdbba227f1dc5f24, < b85569585d0154d4db1e4f9e3e6a4731d407feb0; >= 618f003199c6188e01472b03cdbba227f1dc5f24, < 0ce160c5bdb67081a62293028dc85758a8efb22a; cecfdb9cf9a700d1037066173abac0617f6788df; eb7b40d9d3785f7a131fb0b1f89bb6efa46c1833; >= 5.10.51, < 5.10.237; >= 5.12.18, < 5.13; >= 5.13.3, < 5.14 |
| Linux | Linux | 5.14 |
References
- https://git.kernel.org/stable/c/0ce160c5bdb67081a62293028dc85758a8efb22aPatch
- https://git.kernel.org/stable/c/22e9b83f0f33bc5a7a3181769d1dccbf021f5b04Patch
- https://git.kernel.org/stable/c/7aac0c17a8cdf4a3236991c1e60435c6a984076cPatch
- https://git.kernel.org/stable/c/9203817ba46ebba7c865c8de2aba399537b6e891Patch
- https://git.kernel.org/stable/c/b85569585d0154d4db1e4f9e3e6a4731d407feb0Patch
- https://git.kernel.org/stable/c/cf3196e5e2f36cd80dab91ffae402e13935724bcPatch
- https://git.kernel.org/stable/c/fa78fb51d396f4f2f80f8e96a3b1516f394258bePatch
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2025/05/msg00030.htmlMailing List, Third Party Advisory
Timeline
- Published
- Oct 21, 2024
- Last modified
- Aug 4, 2026
- NVD status
- Modified