Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: erofs: reliably distinguish block based and fscache mode When erofs_kill_sb() is called in block dev based mode, s_bdev may not have been initialised yet, and if CONFIG_EROFS_FS_ONDEMAND is enabled, it will be mistaken for fscache mode, and then attempt to free an anon_dev that has never been allocated, triggering the following warning: ============================================ ida_free called for id=0 which is not allocated. WARNING: CPU: 14 PID: 926 at lib/idr.c:525 ida_free+0x134/0x140 Modules linked in: CPU: 14 PID: 926 Comm: mount Not tainted 6.9.0-rc3-dirty #630 RIP: 0010:ida_free+0x134/0x140 Call Trace: <TASK> erofs_kill_sb+0x81/0x90 deactivate_locked_super+0x35/0x80 get_tree_bdev+0x136/0x1e0 vfs_get_tree+0x2c/0xf0 do_new_mount+0x190/0x2f0 [...] ============================================ Now when erofs_kill_sb() is called, erofs_sb_info must have been initialised, so use sbi->fsid to distinguish between the two modes.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 6.6, < 6.6.32 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/7af2ae1b1531feab5d38ec9c8f472dc6cceb4606Patch
- https://git.kernel.org/stable/c/dcdd49701e429c55b3644fd70fc58d85745f8cfePatch
- https://git.kernel.org/stable/c/f9b877a7ee312ec8ce17598a7ef85cb820d7c371Patch
- https://git.kernel.org/stable/c/7af2ae1b1531feab5d38ec9c8f472dc6cceb4606Patch
- https://git.kernel.org/stable/c/dcdd49701e429c55b3644fd70fc58d85745f8cfePatch
- https://git.kernel.org/stable/c/f9b877a7ee312ec8ce17598a7ef85cb820d7c371Patch
FAQ
What is CVE-2024-36966?
CVE-2024-36966 is a vulnerability with a CVSS score of 5.5 (MEDIUM). In the Linux kernel, the following vulnerability has been resolved: erofs: reliably distinguish block based and fscache mode When erofs_kill_sb() is called in block dev based mode, s_bdev may not ha...
How severe is CVE-2024-36966?
CVE-2024-36966 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2024-36966?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.