CVE-2021-46971

perf/core: Fix unconditional security_locked_down() call

Description

In the Linux kernel, the following vulnerability has been resolved: perf/core: Fix unconditional security_locked_down() call Currently, the lockdown state is queried unconditionally, even though its result is used only if the PERF_SAMPLE_REGS_INTR bit is set in attr.sample_type. While that doesn't matter in case of the Lockdown LSM, it causes trouble with the SELinux's lockdown hook implementation. SELinux implements the locked_down hook with a check whether the current task's type has the corresponding "lockdown" class permission ("integrity" or "confidentiality") allowed in the policy. This means that calling the hook when the access control decision would be ignored generates a bogus permission check and audit record. Fix this by checking sample_type first and only calling the hook when its result would be honored.

3.3

CVSS

Severity: Low

CVSS 3.1 •

EPSS 0.01%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/b246759284d6a2bc5b6f1009caeeb3abce2ec9ff	patch
https://git.kernel.org/stable/c/4348d3b5027bc3ff6336368b6c60605d4ef8e1ce	patch
https://git.kernel.org/stable/c/f5809ca4c311b71bfaba6d13f4e39eab0557895e	patch
https://git.kernel.org/stable/c/c7b0208ee370b89d20486fae71cd9abb759819c1	patch
https://git.kernel.org/stable/c/08ef1af4de5fe7de9c6d69f1e22e51b66e385d9b	patch

Frequently Asked Questions

What is the severity of CVE-2021-46971?: CVE-2021-46971 has been scored as a low severity vulnerability.
How to fix CVE-2021-46971?: To fix CVE-2021-46971, 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-2021-46971 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2021-46971 is being actively exploited. 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-2021-46971?: CVE-2021-46971 affects Linux Linux, Linux Linux.

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