CVE-2022-48931
configfs: fix a race in configfs_{,un}register_subsystem()
- Published
- Updated
- Reserved
- Assigned by
- Linux
Description
In the Linux kernel, the following vulnerability has been resolved: configfs: fix a race in configfs_{,un}register_subsystem() When configfs_register_subsystem() or configfs_unregister_subsystem() is executing link_group() or unlink_group(), it is possible that two processes add or delete list concurrently. Some unfortunate interleavings of them can cause kernel panic. One of cases is: A --> B --> C --> D A <-- B <-- C <-- D delete list_head *B | delete list_head *C --------------------------------|----------------------------------- configfs_unregister_subsystem | configfs_unregister_subsystem unlink_group | unlink_group unlink_obj | unlink_obj list_del_init | list_del_init __list_del_entry | __list_del_entry __list_del | __list_del // next == C | next->prev = prev | | next->prev = prev prev->next = next | | // prev == B | prev->next = next Fix this by adding mutex when calling link_group() or unlink_group(), but parent configfs_subsystem is NULL when config_item is root. So I create a mutex configfs_subsystem_mutex.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Analyzed | 3.1 | Medium4.7 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.17% · top 94% 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 4.7.
Weakness
Affected products
- affected 7063fbf2261194f72ee75afca67b3b38b554b5fa – < 40805099af11f68c5ca7dbcfacf455da8f99f622
- affected 7063fbf2261194f72ee75afca67b3b38b554b5fa – < d1654de19d42f513b6cfe955cc77e7f427e05a77
- affected 7063fbf2261194f72ee75afca67b3b38b554b5fa – < a37024f7757c25550accdebf49e497ad6ae239fe
- affected 7063fbf2261194f72ee75afca67b3b38b554b5fa – < b7e2b91fcb5c78c414e33dc8d50642e307ca0c5a
- affected 7063fbf2261194f72ee75afca67b3b38b554b5fa – < a7ab53d3c27dfe83bb594456b9f38a37796ec39b
- affected 7063fbf2261194f72ee75afca67b3b38b554b5fa – < e7a66dd2687758718eddd79b542a95cf3aa488cc
- affected 7063fbf2261194f72ee75afca67b3b38b554b5fa – < 3aadfd46858b1f64d4d6a0654b863e21aabff975
- affected 7063fbf2261194f72ee75afca67b3b38b554b5fa – < 84ec758fb2daa236026506868c8796b0500c047d
- affected 2.6.16
- unaffected < 2.6.16
- unaffected 4.9.304 – ≤ 4.9.*
- unaffected 4.14.269 – ≤ 4.14.*
- unaffected 4.19.232 – ≤ 4.19.*
- unaffected 5.4.182 – ≤ 5.4.*
- unaffected 5.10.103 – ≤ 5.10.*
- unaffected 5.15.26 – ≤ 5.15.*
- unaffected 5.16.12 – ≤ 5.16.*
- unaffected 5.17 – ≤ *
References (8)
- https://git.kernel.org/stable/c/40805099af11f68c5ca7dbcfacf455da8f99f622 (opens in a new tab)
- https://git.kernel.org/stable/c/d1654de19d42f513b6cfe955cc77e7f427e05a77 (opens in a new tab)
- https://git.kernel.org/stable/c/a37024f7757c25550accdebf49e497ad6ae239fe (opens in a new tab)
- https://git.kernel.org/stable/c/b7e2b91fcb5c78c414e33dc8d50642e307ca0c5a (opens in a new tab)
- https://git.kernel.org/stable/c/a7ab53d3c27dfe83bb594456b9f38a37796ec39b (opens in a new tab)
- https://git.kernel.org/stable/c/e7a66dd2687758718eddd79b542a95cf3aa488cc (opens in a new tab)
- https://git.kernel.org/stable/c/3aadfd46858b1f64d4d6a0654b863e21aabff975 (opens in a new tab)
- https://git.kernel.org/stable/c/84ec758fb2daa236026506868c8796b0500c047d (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)
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[](https://trackcve.app/cve/CVE-2022-48931)Record last updated .