CVE-2021-47494cfg80211: fix management registrations locking
- 7.8HighCVSS base score
- 0.17%Exploitation in 30 daysEPSS · top 94% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
Published
- 2 years later
· 2 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.17% · top 94% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected 6cd536fe62ef58d7c4eac2da07ab0ed7fd19010d – < 4c22227e39c7a0b4dab55617ee8d34d171fab8d4
- affected 6cd536fe62ef58d7c4eac2da07ab0ed7fd19010d – < 3c897f39b71fe68f90599f6a45b5f7bf5618420e
- affected 6cd536fe62ef58d7c4eac2da07ab0ed7fd19010d – < 09b1d5dc6ce1c9151777f6c4e128a59457704c97
- affected 5.8
- unaffected < 5.8
- unaffected 5.10.77 – ≤ 5.10.*
- unaffected 5.14.16 – ≤ 5.14.*
- unaffected 5.15 – ≤ *
References
References3
- https://git.kernel.org/stable/c/4c22227e39c7a0b4dab55617ee8d34d171fab8d4 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/3c897f39b71fe68f90599f6a45b5f7bf5618420e (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/09b1d5dc6ce1c9151777f6c4e128a59457704c97 (opens in a new tab)x_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2021-34498 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2021-47494)Record last updated .