Android Kernel Race Condition Vulnerability

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

• cpe debian/debian linux9.0
• cpe google/androidversion unspecified
• cpe linux/linux kernel5.14
• vendor Android Androidversion unspecified
• vendor Android Kernelversion unspecified

How to fix CVE-2021-0920

• Recommended remediation

  Apply updates per vendor instructions. CISA due date Jun 13, 2022.

• Official advisories

  • CISA KEV · cisa.gov
  • CVE.org · cve.org
  • FIRST EPSS · first.org
  • NIST NVD · nvd.nist.gov
  • VulnCheck KEV · vulncheck.com

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

1. Dec 15, 2021 · Catalog

   Detected

   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

2. May 23, 2022 · CISA KEV

   Known exploited

   Apply updates per vendor instructions.

3. Jun 13, 2022 · CISA KEV

   Remediation due

   Apply updates per vendor instructions.

4. Jun 16, 2026 · Catalog

   Updated

   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

Sources

• CISA KEVConfirmed exploitationCVE-2021-0920

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

  cisa.gov
• CVE.orgVulnerability recordCVE-2021-0920

  Official CVE identifier

  cve.org
• FIRST EPSSExploitation probabilityCVE-2021-0920

  30-day exploitation probability 0.9%

  first.org
• NIST NVDVulnerability recordCVE-2021-0920

  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 kernelAndro

  nvd.nist.gov
• VulnCheck KEVConfirmed exploitationCVE-2021-0920

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

  vulncheck.com

References

• VulnCheck exploitation evidence · docs.google.com
• Mailing List · lists.debian.org
• CISA note · nvd.nist.gov
• Vendor Advisory · source.android.com
• VulnCheck exploitation evidence · storage.googleapis.com
• Third Party Advisory · cisa.gov
• VulnCheck exploitation evidence · cisa.gov
• VulnCheck exploitation evidence · ox.security

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.