What is CVE-2021-3847?

CVE-2021-3847 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10. CVE-2021-3847 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-3847?

CVE-2021-3847 has a CVSS score of 7.8 out of 10, rated High severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Is there a patch available for CVE-2021-3847?

No patch is currently available for CVE-2021-3847. Monitor the NIST NVD and your Linux distribution's security advisories for updates.

Is CVE-2021-3847 actively exploited?

CVE-2021-3847 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2021-3847

High

An unauthorized access to the execution of the setuid file with capabilities flaw in the Linux kernel OverlayFS subsystem was found in the way user copying a capable file from a nosuid mount into another mount. A local user could use this flaw to escalate their privileges on the system.

Package Linux Kernel

Published 2022-04-01

Last modified 2024-11-21

CVSS version 3.1

Patch available

Awaiting data

CVSS 3.1 score

7.8

out of 10

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Vector string

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness type

CWE-281

CVE-2021-3847 is classified as CWE-281

See CWE-281 on MITRE CWE for full details on this weakness type.

References

The following references provide additional information about CVE-2021-3847 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Red Hat
https://bugzilla.redhat.com/show_bug.cgi?id=2009704

Issue Tracking Third Party Advisory
Openwall
https://www.openwall.com/lists/oss-security/2021/10/14/3

Mailing List Third Party Advisory

Details

CVE ID CVE-2021-3847

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2022-04-01

Modified 2024-11-21

KEV No

Patch Awaiting data

Package linux

Frequently asked questions

What is CVE-2021-3847?

CVE-2021-3847 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 . CVE-2021-3847 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-3847?

CVE-2021-3847 has a CVSS score of 7.8 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Is there a patch available for CVE-2021-3847?

No patch is currently available for CVE-2021-3847. Monitor the NIST NVD and your Linux distribution's security advisories for updates.
Is CVE-2021-3847 actively exploited?

No — CVE-2021-3847 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.