CVE - CVE-2021-46971

CVE-ID
CVE-2021-46971	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
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.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/08ef1af4de5fe7de9c6d69f1e22e51b66e385d9b URL:https://git.kernel.org/stable/c/08ef1af4de5fe7de9c6d69f1e22e51b66e385d9b MISC:https://git.kernel.org/stable/c/4348d3b5027bc3ff6336368b6c60605d4ef8e1ce URL:https://git.kernel.org/stable/c/4348d3b5027bc3ff6336368b6c60605d4ef8e1ce MISC:https://git.kernel.org/stable/c/b246759284d6a2bc5b6f1009caeeb3abce2ec9ff URL:https://git.kernel.org/stable/c/b246759284d6a2bc5b6f1009caeeb3abce2ec9ff MISC:https://git.kernel.org/stable/c/c7b0208ee370b89d20486fae71cd9abb759819c1 URL:https://git.kernel.org/stable/c/c7b0208ee370b89d20486fae71cd9abb759819c1 MISC:https://git.kernel.org/stable/c/f5809ca4c311b71bfaba6d13f4e39eab0557895e URL:https://git.kernel.org/stable/c/f5809ca4c311b71bfaba6d13f4e39eab0557895e
Assigning CNA
kernel.org
Date Record Created
20240227	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20240227)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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