Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 5.8, < 5.10.77 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/09b1d5dc6ce1c9151777f6c4e128a59457704c97Patch
- https://git.kernel.org/stable/c/3c897f39b71fe68f90599f6a45b5f7bf5618420ePatch
- https://git.kernel.org/stable/c/4c22227e39c7a0b4dab55617ee8d34d171fab8d4Patch
- https://git.kernel.org/stable/c/09b1d5dc6ce1c9151777f6c4e128a59457704c97Patch
- https://git.kernel.org/stable/c/3c897f39b71fe68f90599f6a45b5f7bf5618420ePatch
- https://git.kernel.org/stable/c/4c22227e39c7a0b4dab55617ee8d34d171fab8d4Patch
FAQ
What is CVE-2021-47494?
CVE-2021-47494 is a vulnerability with a CVSS score of 5.5 (MEDIUM). 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,...
How severe is CVE-2021-47494?
CVE-2021-47494 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-47494?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.