CVE-2024-49960
7.8 HIGHIn the Linux kernel, the following vulnerability has been resolved: ext4: fix timer use-after-free on failed mount Syzbot has found an ...
Published: 2024-10-21 · Last updated: 2026-06-15
Severity and scoring
- CVSS
- 7.8 HIGH
- Vector
- CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CWE
- CWE-416
Affected products
| Vendor | Product |
|---|---|
| debian | debian_linux, linux_kernel |
| linux | debian_linux, linux_kernel |
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 We should guarantee the timer is no longer active before kfree(sbi).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.
Source: NVD
References
- [NVD]https://nvd.nist.gov/vuln/detail/CVE-2024-49960
- [Patch]https://git.kernel.org/stable/c/0ce160c5bdb67081a62293028dc85758a8efb22a
- [Patch]https://git.kernel.org/stable/c/22e9b83f0f33bc5a7a3181769d1dccbf021f5b04
- [Patch]https://git.kernel.org/stable/c/7aac0c17a8cdf4a3236991c1e60435c6a984076c
- [Patch]https://git.kernel.org/stable/c/9203817ba46ebba7c865c8de2aba399537b6e891
- [Patch]https://git.kernel.org/stable/c/b85569585d0154d4db1e4f9e3e6a4731d407feb0
- [Patch]https://git.kernel.org/stable/c/cf3196e5e2f36cd80dab91ffae402e13935724bc
- [Patch]https://git.kernel.org/stable/c/fa78fb51d396f4f2f80f8e96a3b1516f394258be
- [Other]https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
- [Other]https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html
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