CVE-2022-49220
dax: make sure inodes are flushed before destroy cache
- Published
- Updated
- Reserved
- Assigned by
- Linux
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.
Timeline
ID reserved
By Linux
Published
- 21 months later
· 21 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Analyzed | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.27% · top 81% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected 7b6be8444e0f0dd675b54d059793423d3c9b4c03 – < 770d42fff12d8595adda9025a0b92091f543e775
- affected 7b6be8444e0f0dd675b54d059793423d3c9b4c03 – < ec376f5c11c88c0215d173599db8449cd4196759
- affected 7b6be8444e0f0dd675b54d059793423d3c9b4c03 – < e2951eaa9398415ac054b7bd80b8163b6838ead4
- affected 7b6be8444e0f0dd675b54d059793423d3c9b4c03 – < f2a1e0eb70c2d954176c07d75d28742bde30e9f3
- affected 7b6be8444e0f0dd675b54d059793423d3c9b4c03 – < b786abe7c67c6ef71410c8e23292b3091d616ad1
- affected 7b6be8444e0f0dd675b54d059793423d3c9b4c03 – < a7e8de822e0b1979f08767c751f6c8a9c1d4ad86
- affected 4.12
- unaffected < 4.12
- unaffected 5.4.189 – ≤ 5.4.*
- unaffected 5.10.110 – ≤ 5.10.*
- unaffected 5.15.33 – ≤ 5.15.*
- unaffected 5.16.19 – ≤ 5.16.*
- unaffected 5.17.2 – ≤ 5.17.*
- unaffected 5.18 – ≤ *
References (6)
- https://git.kernel.org/stable/c/770d42fff12d8595adda9025a0b92091f543e775 (opens in a new tab)
- https://git.kernel.org/stable/c/ec376f5c11c88c0215d173599db8449cd4196759 (opens in a new tab)
- https://git.kernel.org/stable/c/e2951eaa9398415ac054b7bd80b8163b6838ead4 (opens in a new tab)
- https://git.kernel.org/stable/c/f2a1e0eb70c2d954176c07d75d28742bde30e9f3 (opens in a new tab)
- https://git.kernel.org/stable/c/b786abe7c67c6ef71410c8e23292b3091d616ad1 (opens in a new tab)
- https://git.kernel.org/stable/c/a7e8de822e0b1979f08767c751f6c8a9c1d4ad86 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2022-49220)Record last updated .