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Vulnerability record · CVE-2021-46971 · published 27 February 2024

CVE-2021-46971: Linux kernel vulnerability

Linux · Linux Kernel

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 3.1 Low EPSS 0.23% · top 87.5%
3.3CVSS 3.1 base score
0.23%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
10References
17 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/08ef1af4de5fe7de9c6d69f1e22e51b66e385d9b Patch
https://git.kernel.org/stable/c/4348d3b5027bc3ff6336368b6c60605d4ef8e1ce Patch
https://git.kernel.org/stable/c/b246759284d6a2bc5b6f1009caeeb3abce2ec9ff Patch
https://git.kernel.org/stable/c/c7b0208ee370b89d20486fae71cd9abb759819c1 Patch
https://git.kernel.org/stable/c/f5809ca4c311b71bfaba6d13f4e39eab0557895e Patch
https://git.kernel.org/stable/c/08ef1af4de5fe7de9c6d69f1e22e51b66e385d9b Patch
https://git.kernel.org/stable/c/4348d3b5027bc3ff6336368b6c60605d4ef8e1ce Patch
https://git.kernel.org/stable/c/b246759284d6a2bc5b6f1009caeeb3abce2ec9ff Patch
https://git.kernel.org/stable/c/c7b0208ee370b89d20486fae71cd9abb759819c1 Patch
https://git.kernel.org/stable/c/f5809ca4c311b71bfaba6d13f4e39eab0557895e Patch

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Source: NIST National Vulnerability Database (record CVE-2021-46971), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.