# CVE-2022-48931: linux: In the Linux kernel, the following vulnerability has been resolved:  configfs: fix a race in configfs_{,un}register_s...

CVE-2022-48931 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-48931, released August 22, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-48931
- Priority: Routine
- CVSS: 4.7 (medium)
- EPSS: 0.0017
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 22, 2024

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.16.12-1 | [DEBIAN-CVE-2022-48931](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48931.md) | Aug 22, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.16.12-1 | [DEBIAN-CVE-2022-48931](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48931.md) | Aug 22, 2024 |
| Linux | linux Debian 14 | 5.16.12-1 | [DEBIAN-CVE-2022-48931](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48931.md) | Aug 22, 2024 |

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