CVE - CVE-2021-47494

CVE-ID
CVE-2021-47494	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
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.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/09b1d5dc6ce1c9151777f6c4e128a59457704c97 URL:https://git.kernel.org/stable/c/09b1d5dc6ce1c9151777f6c4e128a59457704c97 MISC:https://git.kernel.org/stable/c/3c897f39b71fe68f90599f6a45b5f7bf5618420e URL:https://git.kernel.org/stable/c/3c897f39b71fe68f90599f6a45b5f7bf5618420e MISC:https://git.kernel.org/stable/c/4c22227e39c7a0b4dab55617ee8d34d171fab8d4 URL:https://git.kernel.org/stable/c/4c22227e39c7a0b4dab55617ee8d34d171fab8d4
Assigning CNA
kernel.org
Date Record Created
20240522	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20240522)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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