CVE-2024-36961

CVE Details

Release Date:

2024-06-03

Description

In the Linux kernel, the following vulnerability has been resolved:\nthermal/debugfs: Fix two locking issues with thermal zone debug\nWith the current thermal zone locking arrangement in the debugfs code,\nuser space can open the 'mitigations' file for a thermal zone before\nthe zone's debugfs pointer is set which will result in a NULL pointer\ndereference in tze_seq_start().\nMoreover, thermal_debug_tz_remove() is not called under the thermal\nzone lock, so it can run in parallel with the other functions accessing\nthe thermal zone's struct thermal_debugfs object. Then, it may clear\ntz->debugfs after one of those functions has checked it and the\nstruct thermal_debugfs object may be freed prematurely.\nTo address the first problem, pass a pointer to the thermal zone's\nstruct thermal_debugfs object to debugfs_create_file() in\nthermal_debug_tz_add() and make tze_seq_start(), tze_seq_next(),\ntze_seq_stop(), and tze_seq_show() retrieve it from s->private\ninstead of a pointer to the thermal zone object. This will ensure\nthat tz_debugfs will be valid across the 'mitigations' file accesses\nuntil thermal_debugfs_remove_id() called by thermal_debug_tz_remove()\nremoves that file.\nTo address the second problem, use tz->lock in thermal_debug_tz_remove()\naround the tz->debugfs value check (in case the same thermal zone is\nremoved at the same time in two different threads) and its reset to NULL.\nCc :6.8+ # 6.8+

See more information about CVE-2024-36961 from MITRE CVE dictionary and NIST NVD

CVSS Scoring

NOTE: The following CVSS v3.1 metrics and score provided are preliminary and subject to review.

Base Score:	4.4	CVSS Vector:	CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Attack Vector:	Local network	Attack Complexity:	Low
Privileges Required:	High	User Interaction:	None
Scope:	Unchanged	Confidentiality Impact:	None
Integrity Impact:	None	Availability Impact:	High

Errata information

Platform	Errata	Release Date
Oracle Linux version 9 (kernel)	ELSA-2024-9315	2024-11-14