Known exploited vulnerability
CVE-2021-0920
The short answer
CVE-2021-0920 affects n/a Android and is rated medium (CVSS 6.4). CISA added it to the Known Exploited Vulnerabilities catalog on 2022-05-23: attackers are using it, so patch it first.
What it is
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
Severity
6.4 medium
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
Exploited (CISA KEV)
Yes, since May 23, 2022
Federal due date Jun 13, 2022
EPSS, next 30 days
0.87%
Higher than 59% of scored CVEs
How it can be exploited
- Attack vector
- Local
- Attack complexity
- High
- Privileges required
- High
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
What CISA says to do
Apply updates per vendor instructions.
Affected products
Android. NVD's record lists the exact affected versions.
References
- lists.debian.org/debian-lts-announce/2021/12/msg00012.html Mailing ListThird Party Advisory
- source.android.com/security/bulletin/2021-11-01 Vendor Advisory
- lists.debian.org/debian-lts-announce/2021/12/msg00012.html Mailing ListThird Party Advisory
- source.android.com/security/bulletin/2021-11-01 Vendor Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-0920 Third Party AdvisoryUS Government Resource
Questions
Is CVE-2021-0920 being exploited?
Yes. CISA added CVE-2021-0920 to its Known Exploited Vulnerabilities catalog on 2022-05-23, with a federal remediation due date of 2022-06-13.
How do I fix CVE-2021-0920?
CISA's required action: Apply updates per vendor instructions.
From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.
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