Medium 6.4Known exploited (CISA KEV)Published Dec 15, 2021

CVE-2021-0920In unix_scm_to_skb of af_unix.c, there is a possible use after free bug due to a race condition.

Updated under an hour ago (Oct 28, 2026, 5:30 AM ET)

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It affects linux_kernel and 2 other products. Add what you run to find out whether that includes you.

CISA lists it as known exploited since May 23, 2022; federal agencies had to remediate by Jun 13, 2022. Treat that date as your deadline.

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Exploited in the last 30 days

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: 6.4 MEDIUM (v3.1, CISA ADP)CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-416
Known exploited: Added to CISA KEV May 23, 2022; federal remediation due Jun 13, 2022Apply updates per vendor instructions.
EPSS (exploitation in the next 30 days): 0.87% (percentile 59)
Assigned by: google_android
NVD analysis: Analyzed
Record last updated: Oct 21, 2025
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

linux linux_kernel linux:linux_kernel	through 5.13; 5.14; 5.14; 5.14	NVD
google android google:android	all versions	NVD
debian debian_linux debian:debian_linux	9.0	NVD

References

References

https://source.android.com/security/bulletin/2021-11-01	x-refsource-misc, vendor-advisory
https://lists.debian.org/debian-lts-announce/2021/12/msg00012.html	mailing-list, x-refsource-mlist, third-party-advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-0920	third-party-advisory, us-government-resource

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.