CVE-2022-49281
cifs: fix handlecache and multiuser
- Published
- Updated
- Reserved
- Assigned by
- Linux
Description
In the Linux kernel, the following vulnerability has been resolved: cifs: fix handlecache and multiuser In multiuser each individual user has their own tcon structure for the share and thus their own handle for a cached directory. When we umount such a share we much make sure to release the pinned down dentry for each such tcon and not just the master tcon. Otherwise we will get nasty warnings on umount that dentries are still in use: [ 3459.590047] BUG: Dentry 00000000115c6f41{i=12000000019d95,n=/} still in use\ (2) [unmount of cifs cifs] ... [ 3459.590492] Call Trace: [ 3459.590500] d_walk+0x61/0x2a0 [ 3459.590518] ? shrink_lock_dentry.part.0+0xe0/0xe0 [ 3459.590526] shrink_dcache_for_umount+0x49/0x110 [ 3459.590535] generic_shutdown_super+0x1a/0x110 [ 3459.590542] kill_anon_super+0x14/0x30 [ 3459.590549] cifs_kill_sb+0xf5/0x104 [cifs] [ 3459.590773] deactivate_locked_super+0x36/0xa0 [ 3459.590782] cleanup_mnt+0x131/0x190 [ 3459.590789] task_work_run+0x5c/0x90 [ 3459.590798] exit_to_user_mode_loop+0x151/0x160 [ 3459.590809] exit_to_user_mode_prepare+0x83/0xd0 [ 3459.590818] syscall_exit_to_user_mode+0x12/0x30 [ 3459.590828] do_syscall_64+0x48/0x90 [ 3459.590833] entry_SYSCALL_64_after_hwframe+0x44/0xae
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 (6 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected 5e9c89d43fa6f5d458d4d0f9e22a67cc001c8da9 – < 2fafbc198613823943c106d1ec9b516da692059f
- affected 5e9c89d43fa6f5d458d4d0f9e22a67cc001c8da9 – < ffa631c4bff59dde59b598011f570e27dfba3515
- affected 5e9c89d43fa6f5d458d4d0f9e22a67cc001c8da9 – < e71f6a3a1d5c826a30384fec587ca7503ef6bde5
- affected 5e9c89d43fa6f5d458d4d0f9e22a67cc001c8da9 – < 47178c7722ac528ea08aa82c3ef9ffa178962d7a
- affected 5.13
- unaffected < 5.13
- unaffected 5.15.33 – ≤ 5.15.*
- unaffected 5.16.19 – ≤ 5.16.*
- unaffected 5.17.2 – ≤ 5.17.*
- unaffected 5.18 – ≤ *
References (4)
- https://git.kernel.org/stable/c/2fafbc198613823943c106d1ec9b516da692059f (opens in a new tab)
- https://git.kernel.org/stable/c/ffa631c4bff59dde59b598011f570e27dfba3515 (opens in a new tab)
- https://git.kernel.org/stable/c/e71f6a3a1d5c826a30384fec587ca7503ef6bde5 (opens in a new tab)
- https://git.kernel.org/stable/c/47178c7722ac528ea08aa82c3ef9ffa178962d7a (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-2022-49281)Record last updated .