CVEvulnerability

CVE-2021-0920

6.4 MEDIUM Known exploited Published 2021-12-15 Modified 2026-06-17 Official page ↗

CISA Known Exploited Vulnerability

Android Kernel Race Condition Vulnerability — Android Kernel

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

Added to KEV
2022-05-23
Remediation due
2022-06-13
Ransomware use
Unknown
Required action
Apply updates per vendor instructions.
Notes
https://nvd.nist.gov/vuln/detail/CVE-2021-0920
Status
Analyzed
Published
2021-12-15
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
6.4 MEDIUM — CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
6.4 MEDIUM — CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0 ([email protected])
6.9 MEDIUM — AV:L/AC:M/Au:N/C:C/I:C/A:C
Weaknesses
CWE-362, CWE-416

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

Affected configurations

• linux linux kernel (<= 5.13) • linux linux kernel 5.14 • google android • debian debian linux 9.0

Related

Weakness · CWE (2)

  • CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization weakness
  • CWE-416 Use After Free weakness

Referenced by CWE · observed example (2)

  • CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization weakness
  • CWE-416 Use After Free weakness

References