What is CVE-2021-21781?

CVE-2021-21781 is a Low severity Linux kernel vulnerability with a CVSS score of 3.3 out of 10. CVE-2021-21781 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-21781?

CVE-2021-21781 has a CVSS score of 3.3 out of 10, rated Low severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.

Is there a patch available for CVE-2021-21781?

No patch is currently available for CVE-2021-21781. Monitor the NIST NVD and your Linux distribution's security advisories for updates.

Is CVE-2021-21781 actively exploited?

CVE-2021-21781 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2021-21781

Low

An information disclosure vulnerability exists in the ARM SIGPAGE functionality of Linux Kernel v5.4.66 and v5.4.54. The latest version (5.11-rc4) seems to still be vulnerable. A userland application can read the contents of the sigpage, which can leak kernel memory contents. An attacker can read a process’s memory at a specific offset to trigger this vulnerability. This was fixed in kernel releases: 4.14.222 4.19.177 5.4.99 5.10.17 5.11

Package Linux Kernel

Published 2021-08-18

Last modified 2024-11-21

CVSS version 3.1

Patch available

Awaiting data

CVSS 3.1 score

3.3

out of 10

Low

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

Vector string

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

Weakness type

CWE-908

CVE-2021-21781 is classified as CWE-908

See CWE-908 on MITRE CWE for full details on this weakness type.

References

The following references provide additional information about CVE-2021-21781 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Talosintelligence
https://talosintelligence.com/vulnerability_reports/TALOS-2021-1243

Exploit Third Party Advisory
Kernel patch commit
https://www.oracle.com/security-alerts/cpujul2022.html
Patch

Details

CVE ID CVE-2021-21781

Severity Low

CVSS score 3.3 / 10

CVSS version 3.1

Published 2021-08-18

Modified 2024-11-21

KEV No

Patch Awaiting data

Package linux

Frequently asked questions

What is CVE-2021-21781?

CVE-2021-21781 is a Low severity Linux kernel vulnerability with a CVSS score of 3.3 out of 10 . CVE-2021-21781 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-21781?

CVE-2021-21781 has a CVSS score of 3.3 out of 10, rated Low severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.
Is there a patch available for CVE-2021-21781?

No patch is currently available for CVE-2021-21781. Monitor the NIST NVD and your Linux distribution's security advisories for updates.
Is CVE-2021-21781 actively exploited?

No — CVE-2021-21781 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.