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Fencer Vulns
high 7.8

CVE-2021-47251 json

mac80211: fix skb length check in ieee80211_scan_rx()

published 2024-05-21 2 y ago modified 2026-06-17 4 mo ago also EUVD-2021-33899

cvss
7.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 14%
public exploits
0
none known

Summary

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]

Patch / fix

  • Linux Linux 5.10.46, 5.12.13, 5.13
  • linux Debian 14, Debian 13, Debian 12 5.10.46-1

debian advisories DEBIAN-CVE-2021-47251

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-47251 updated cvss 5.5

kernel: mac80211: fix skb length check in ieee80211_scan_rx()

  • Red Hat Migration Toolkit for Virtualization migration-toolkit-virtualization/mtv-virt-v2v-rhel10 Red Hat NVIDIA JetPack 6 for RHEL nvidia/nvidia-jetpack-for-rhel9 Red Hat Certification Program for Red Hat Enterprise Linux 9 rhcertification/redhat-certification-cloud-10, rhcertification/redhat-certification-system-ai-10
    affected: no fix available
  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 9 rhel9/rhel-bootc, rhel9-eus/rhel-9.4-bootc, rhel9-eus/rhel-9.6-bootc, rhel9-eus/rhel-9.8-bootc, kmod-redhat-mac80211 5.14.0_284.11.1_dup9.2-3.el9_2 Red Hat Enterprise Linux 10 rhel10/rhel-bootc, rhel10-eus/rhel-10.0-bootc, rhel10-eus/rhel-10.2-bootc Red Hat OpenShift Container Platform 4 openshift4/driver-toolkit-rhel8, openshift4/driver-toolkit-rhel9 Red Hat OpenShift Container Platform 5 openshift5/driver-toolkit-rhel9, openshift5/driver-toolkit-rhel10
    affected: no fix available
  • Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +83 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.23% chance of exploitation in the next 30 days, higher than 14% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Linux Linux

Classification

Weakness
  • CWE-1284 Improper Validation of Specified Quantity in Input
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.