CVE-2021-47494

cfg80211: fix management registrations locking

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.

N/A

CVSS

Severity:

EPSS 0.07%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/4c22227e39c7a0b4dab55617ee8d34d171fab8d4
https://git.kernel.org/stable/c/3c897f39b71fe68f90599f6a45b5f7bf5618420e
https://git.kernel.org/stable/c/09b1d5dc6ce1c9151777f6c4e128a59457704c97

Frequently Asked Questions

What is the severity of CVE-2021-47494?: CVE-2021-47494 has not yet been assigned a CVSS score.
How to fix CVE-2021-47494?: To fix CVE-2021-47494, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-47494 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2021-47494 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-47494?: CVE-2021-47494 affects Linux Linux, Linux Linux.

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