CVE-2021-47251

mac80211: fix skb length check in ieee80211_scan_rx()

HIGH
7.8
CVSS Score
Published: May 21, 2024 at 02:19 PM UTC
Updated: June 17, 2026 at 04:17 AM UTC
1 product affected across 1 vendorLinux Kernel

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Severity
HIGH7.8
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

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]

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

5.10 ≤ v < 5.10.465.10 ≤ v < 5.12.135.10 ≤ v < 5.135.11 ≤ v < 5.12.135.13 rc15.13 rc25.13 rc35.13 rc45.13 rc55.13 rc6cd418ba63f0c2f6157f35a41c9accc6ecb52590a
Vendor states this is fixed in 5a1cd67a801cf5ef989c4783e07b86a25b143126 (fixed)
Vendor states this is fixed in d1b949c70206178b12027f66edc088d40375b5cb (fixed)
Vendor states this is fixed in e298aa358f0ca658406d524b6639fe389cb6e11e (fixed)
Vendor states this is fixed in 5.10 (unaffected)
Vendor states this is fixed in 5.10.46 (unaffected)
Vendor states this is fixed in 5.12.13 (unaffected)
Vendor states this is fixed in 5.13 (unaffected)

References (3)

Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/5a1cd67a801cf5ef989c4783e07b86a25b143126
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/d1b949c70206178b12027f66edc088d40375b5cb
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/e298aa358f0ca658406d524b6639fe389cb6e11e

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-1284

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