7.8

CVE-2024-49960

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

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guarantee the timer is no longer active before kfree(sbi).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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Debian ≫ Debian Linux Version11.0
Linux ≫ Linux Kernel Version < 5.10.237
Linux ≫ Linux Kernel Version >= 5.11 < 5.15.181
Linux ≫ Linux Kernel Version >= 5.16 < 6.1.118
Linux ≫ Linux Kernel Version >= 6.2 < 6.6.55
Linux ≫ Linux Kernel Version >= 6.7 < 6.10.14
Linux ≫ Linux Kernel Version >= 6.11 < 6.11.3
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EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.28% 0.195
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 7.8 1.8 5.9
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-416 Use After Free

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

https://git.kernel.org/stable/c/0ce160c5bdb67081a62293028dc85758a8efb22a
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
Patch
https://git.kernel.org/stable/c/22e9b83f0f33bc5a7a3181769d1dccbf021f5b04
Patch
https://git.kernel.org/stable/c/7aac0c17a8cdf4a3236991c1e60435c6a984076c
Patch
https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html
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https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
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