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

Status: PUBLISHED

Assigner: Linux

Published: 2024-05-22T08:19:42.083Z

Updated: 2024-08-04T05:39:59.605Z

Reserved: 2024-05-22T06:20:56.201Z

Link: CVE-2021-47494

cve-icon Vulnrichment

Updated: 2024-08-04T05:39:59.605Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2024-05-22T09:15:11.270

Modified: 2024-05-22T12:46:53.887

Link: CVE-2021-47494

cve-icon Redhat

Severity : Moderate

Publid Date: 2024-05-22T00:00:00Z

Links: CVE-2021-47494 - Bugzilla