What is CVE-2021-3492?

CVE-2021-3492 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10, classified as a Memory Leak flaw (CWE-401). CVE-2021-3492 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-3492?

CVE-2021-3492 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-2021-3492?

No patch is currently available for CVE-2021-3492. Monitor the NIST NVD and your Linux distribution's security advisories for updates.

Is CVE-2021-3492 actively exploited?

CVE-2021-3492 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Memory Leak (CWE-401)?

The product does not release memory after use, causing gradual resource exhaustion. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/401.html

CVE-2021-3492

High

Shiftfs, an out-of-tree stacking file system included in Ubuntu Linux kernels, did not properly handle faults occurring during copy_from_user() correctly. These could lead to either a double-free situation or memory not being freed at all. An attacker could use this to cause a denial of service (kernel memory exhaustion) or gain privileges via executing arbitrary code. AKA ZDI-CAN-13562.

Package Linux Kernel

Published 2021-04-17

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-401

CVE-2021-3492 is a Memory Leak vulnerability

What is Memory Leak?

The product does not release memory after use, causing gradual resource exhaustion. Learn more on MITRE CWE

References

The following references provide additional information about CVE-2021-3492 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Packet Storm
http://packetstormsecurity.com/files/162614/Kernel-Live-Patch-Security-Notice-LSN-0077-1.html

Third Party Advisory VDB Entry
Ubuntu Security
https://ubuntu.com/security/notices/USN-4917-1

Vendor Advisory
Openwall
https://www.openwall.com/lists/oss-security/2021/04/16/2

Mailing List Third Party Advisory
Zerodayinitiative
https://www.zerodayinitiative.com/advisories/ZDI-21-422/

Third Party Advisory VDB Entry
Kernel patch commit
https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/focal/commit/?id=25c891a949bf918b59cbc6e4932015ba4c35c333
Patch
Kernel patch commit
https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/focal/commit/?id=8fee52ab9da87d82bc6de9ebb3480fff9b4d53e6
Patch

Details

CVE ID CVE-2021-3492

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2021-04-17

Modified 2024-11-21

KEV No

Patch Awaiting data

Package linux

Frequently asked questions

What is CVE-2021-3492?

CVE-2021-3492 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 , classified as a Memory Leak flaw (CWE-401) . CVE-2021-3492 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-3492?

CVE-2021-3492 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-2021-3492?

No patch is currently available for CVE-2021-3492. Monitor the NIST NVD and your Linux distribution's security advisories for updates.
Is CVE-2021-3492 actively exploited?

No — CVE-2021-3492 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.
What is Memory Leak (CWE-401)?

The product does not release memory after use, causing gradual resource exhaustion. View CWE-401 on MITRE CWE →