CVE-2024-49960
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 We should guarantee the timer is no longer active before kfree(sbi).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.
How to fix
- linux linux_kernel5.10.237, 5.15.181, 6.1.118, 6.6.55, 6.10.14, 6.11.3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | v < 5.10.237, 5.11 ≤ v < 5.15.181, 5.16 ≤ v < 6.1.118, 6.2 ≤ v < 6.6.55, 6.7 ≤ v < 6.10.14, 6.11 ≤ v < 6.11.3 | 5.10.237, 5.15.181, 6.1.118, 6.6.55, 6.10.14, 6.11.3 |
| debian debian_linux | 11.0 | — |
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