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CVE-2021-0920

Android Kernel Race Condition

6.4 MEDIUMActively exploited (CISA KEV)EPSS 0.82%
  1. Published15 Dec 2021
  2. Added to CISA KEV23 May 2022
  3. Remediation due13 Jun 2022
Actively exploited (CISA KEV)

Android kernel contains a race condition, which allows for a use-after-free vulnerability. Exploitation can allow for privilege escalation.

Added to KEV: 23 May 2022Federal remediation due: 13 Jun 2022

Description

In unix_scm_to_skb of af_unix.c, there is a possible use after free bug due to a race condition. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-196926917References: Upstream kernel

CVSS 3.1 breakdown

Attack vectorLocal
Attack complexityHigh
Privileges requiredHigh
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

Affected products

Debian Linux9.0
Google Androidall versions
Linux Kernel≤ 5.13 · 5.14

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

References

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Frequently asked

Is CVE-2021-0920 being actively exploited?

Yes. CVE-2021-0920 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 23 May 2022.

How severe is CVE-2021-0920?

CVE-2021-0920 has a CVSS 3.1 base score of 6.4, rated medium. EPSS estimates a 0.82% probability of exploitation.

Which products are affected by CVE-2021-0920?

Affected products include Debian Linux, Google Android, Linux Kernel.

How do I fix CVE-2021-0920?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2021-0920 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.