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.

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity High

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation none

Automatable no

Technical Impact partial

Affected Vendors & Products

Vendors Products
Linux
  • Linux Kernel

Configuration 1 [-]

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

No data.

References
Link Providers
https://git.kernel.org/stable/c/3aadfd46858b1f64d4d6a0654b863e21aabff975 cve-icon cve-icon
https://git.kernel.org/stable/c/40805099af11f68c5ca7dbcfacf455da8f99f622 cve-icon cve-icon
https://git.kernel.org/stable/c/84ec758fb2daa236026506868c8796b0500c047d cve-icon cve-icon
https://git.kernel.org/stable/c/a37024f7757c25550accdebf49e497ad6ae239fe cve-icon cve-icon
https://git.kernel.org/stable/c/a7ab53d3c27dfe83bb594456b9f38a37796ec39b cve-icon cve-icon
https://git.kernel.org/stable/c/b7e2b91fcb5c78c414e33dc8d50642e307ca0c5a cve-icon cve-icon
https://git.kernel.org/stable/c/d1654de19d42f513b6cfe955cc77e7f427e05a77 cve-icon cve-icon
https://git.kernel.org/stable/c/e7a66dd2687758718eddd79b542a95cf3aa488cc cve-icon cve-icon
https://lore.kernel.org/linux-cve-announce/2024082222-CVE-2022-48931-ec5b@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2022-48931 cve-icon
https://www.cve.org/CVERecord?id=CVE-2022-48931 cve-icon
History

Wed, 11 Sep 2024 13:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Fri, 23 Aug 2024 02:15:00 +0000

Type Values Removed Values Added
First Time appeared Linux
Linux linux Kernel
Weaknesses CWE-362
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
Metrics cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

 cvssV3_1

{'score': 4.7, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H'}

Thu, 22 Aug 2024 17:00:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

threat_severity

Moderate

Thu, 22 Aug 2024 03:45:00 +0000

Type Values Removed Values Added
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.
Title configfs: fix a race in configfs_{,un}register_subsystem()
References
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2024-08-22T03:31:24.823Z

Updated: 2024-09-12T17:33:10.278Z

Reserved: 2024-08-21T06:06:23.299Z

Link: CVE-2022-48931

cve-icon Vulnrichment

Updated: 2024-09-11T12:42:15.600Z

cve-icon NVD

Status : Analyzed

Published: 2024-08-22T04:15:16.010

Modified: 2024-08-23T01:54:11.640

Link: CVE-2022-48931

cve-icon Redhat

Severity : Moderate

Publid Date: 2024-08-22T00:00:00Z

Links: CVE-2022-48931 - Bugzilla