Instituto Nacional de ciberseguridad. Sección Incibe
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CVE-2021-47494

Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
22/05/2024
Last modified:
24/09/2025

Description

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> cfg80211: fix management registrations locking<br /> <br /> The management registrations locking was broken, the list was<br /> locked for each wdev, but cfg80211_mgmt_registrations_update()<br /> iterated it without holding all the correct spinlocks, causing<br /> list corruption.<br /> <br /> Rather than trying to fix it with fine-grained locking, just<br /> move the lock to the wiphy/rdev (still need the list on each<br /> wdev), we already need to hold the wdev lock to change it, so<br /> there&amp;#39;s no contention on the lock in any case. This trivially<br /> fixes the bug since we hold one wdev&amp;#39;s lock already, and now<br /> will hold the lock that protects all lists.

Impact

Vector 3.x
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 5.50 MEDIUM
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

Base Score 3.x
5.50
Severity 3.x
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 5.8 (including) 5.10.77 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 5.11 (including) 5.14.16 (excluding)
cpe:2.3:o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc7:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools