CVE-2021-21781

Public Exploit

Description

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

Category

3.3
CVSS
Severity: Low
CVSS 3.1 •
CVSS 3.0 •
CVSS 2.0 •
EPSS 0.01%
Third-Party Advisory talosintelligence.com Third-Party Advisory oracle.com
Affected: n/a Linux Kernel
Published at:
Updated at:

References

Link Tags
https://talosintelligence.com/vulnerability_reports/TALOS-2021-1243 third party advisory exploit
https://www.oracle.com/security-alerts/cpujul2022.html third party advisory patch

Frequently Asked Questions

What is the severity of CVE-2021-21781?
CVE-2021-21781 has been scored as a low severity vulnerability.
How to fix CVE-2021-21781?
To fix CVE-2021-21781, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-21781 being actively exploited in the wild?
It is possible that CVE-2021-21781 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-21781?
CVE-2021-21781 affects n/a Linux Kernel.
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