vulnerability
Ubuntu: (CVE-2022-49220): linux vulnerability
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 5 | (AV:L/AC:L/Au:S/C:N/I:N/A:C) | Feb 26, 2025 | Mar 3, 2025 | Jun 12, 2025 |
Description
In the Linux kernel, the following vulnerability has been resolved:
dax: make sure inodes are flushed before destroy cache
A bug can be triggered by following command
$ modprobe nd_pmem && modprobe -r nd_pmem
[ 10.060014] BUG dax_cache (Not tainted): Objects remaining in dax_cache on __kmem_cache_shutdown()
[ 10.060938] Slab 0x0000000085b729ac objects=9 used=1 fp=0x000000004f5ae469 flags=0x200000000010200(slab|head|node)
[ 10.062433] Call Trace:
[ 10.062673] dump_stack_lvl+0x34/0x44
[ 10.062865] slab_err+0x90/0xd0
[ 10.063619] __kmem_cache_shutdown+0x13b/0x2f0
[ 10.063848] kmem_cache_destroy+0x4a/0x110
[ 10.064058] __x64_sys_delete_module+0x265/0x300
This is caused by dax_fs_exit() not flushing inodes before destroy cache.
To fix this issue, call rcu_barrier() before destroy cache.
Solution(s)
References
- CVE-2022-49220
- https://attackerkb.com/topics/CVE-2022-49220
- URL-https://git.kernel.org/linus/a7e8de822e0b1979f08767c751f6c8a9c1d4ad86
- URL-https://git.kernel.org/stable/c/770d42fff12d8595adda9025a0b92091f543e775
- URL-https://git.kernel.org/stable/c/a7e8de822e0b1979f08767c751f6c8a9c1d4ad86
- URL-https://git.kernel.org/stable/c/b786abe7c67c6ef71410c8e23292b3091d616ad1
- URL-https://git.kernel.org/stable/c/e2951eaa9398415ac054b7bd80b8163b6838ead4
- URL-https://git.kernel.org/stable/c/ec376f5c11c88c0215d173599db8449cd4196759
- URL-https://git.kernel.org/stable/c/f2a1e0eb70c2d954176c07d75d28742bde30e9f3
- URL-https://www.cve.org/CVERecord?id=CVE-2022-49220
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