Vulnary
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Critical· 9.8official fix available

CVE-2021-47013

This vulnerability is a use‑after‑free bug in the Linux kernel’s emac driver. An attacker could exploit it to crash the system or potentially run arbitrary code. The issue has been fixed in a kernel update.

publishedFeb 28, 2024
last modifiedAug 4, 2026
sourcesNVD
severity · cvss
9.8
critical · how bad it is
exploitation · epss
<1%
53th percentile · chance of exploitation in 30 days
(ai-assisted) A model wrote this summary from the official data, so double-check it against the source before you act on it. Read the official advisory →
auto-deletes from the system
counting…on Sep 4, 2026

An official fix is available, so this entry is kept for 30 days and then removed automatically.

01

Who is affected

Linux kernel, specifically the emac driver (net:emac/emac-mac). Users running affected kernel versions are at risk.

02

Real-world impact

An attacker could crash the system or potentially execute arbitrary code, leading to denial of service or compromise.

03

Why this severity

The CVSS score of 9.8 reflects that the flaw can be exploited remotely with no authentication or user interaction, and it can compromise confidentiality, integrity, and availability.

04

What to do about it

official fix available
recommended steps
  1. 01Check the current kernel version.
  2. 02Update the Linux kernel to a version that includes the CVE‑2021‑47013 fix.
  3. 03Reboot the system to load the updated kernel.

NVD-referenced vendor advisory

05

Timeline

  1. Feb 28, 2024 · Feb 28, 2024
    Published
    Disclosed and added to the National Vulnerability Database.
  2. Aug 4, 2026 · 2d ago
    Advisory updated
    The NVD record was last revised.
  3. Aug 5, 2026 · 17h ago
    Official fix available
    A vendor patch or mitigation now exists — see the remediation steps above.
06

How it’s attacked

Attack vectorNetwork (remote)
Attack complexityLow
Privileges requiredNone
User interactionNone needed
ScopeUnchanged
Confidentiality impactHigh
Integrity impactHigh
Availability impactHigh
07

References & advisories

NVD advisory ↗Search advisories ↗
(ai-assisted) A model wrote this summary from the official data, so double-check it against the source before you act on it. Read the official advisory →