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CVE-2021-47251mac80211: fix skb length check in ieee80211_scan_rx()
- 7.8HighCVSS base score
- 0.23%Exploitation in 30 daysEPSS · top 86% 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: mac80211: fix skb length check in ieee80211_scan_rx() Replace hard-coded compile-time constants for header length check with dynamic determination based on the frame type. Otherwise, we hit a validation WARN_ON in cfg80211 later. [style fixes, reword commit message]
Timeline
ID reserved
By Linux
- 41 days later
· 41 days later
Published
- 24 months later
· 24 months 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 |
|---|---|---|---|
| NVDNVD · Analyzed | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.23% · top 86% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected cd418ba63f0c2f6157f35a41c9accc6ecb52590a – < 5a1cd67a801cf5ef989c4783e07b86a25b143126
- affected cd418ba63f0c2f6157f35a41c9accc6ecb52590a – < d1b949c70206178b12027f66edc088d40375b5cb
- affected cd418ba63f0c2f6157f35a41c9accc6ecb52590a – < e298aa358f0ca658406d524b6639fe389cb6e11e
- affected 5.10
- unaffected < 5.10
- unaffected 5.10.46 – ≤ 5.10.*
- unaffected 5.12.13 – ≤ 5.12.*
- unaffected 5.13 – ≤ *
References
References3
- https://git.kernel.org/stable/c/5a1cd67a801cf5ef989c4783e07b86a25b143126 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/d1b949c70206178b12027f66edc088d40375b5cb (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/e298aa358f0ca658406d524b6639fe389cb6e11e (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-2021-33899 (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-2021-47251)Record last updated .