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CVE-2021-46971

Disclosure Date: February 27, 2024 •
CVE-2021-46971
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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.

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CVSS V3 Severity and Metrics
Base Score:
None
Impact Score:
Unknown
Exploitability Score:
Unknown
Vector:
Unknown
Attack Vector (AV):
Unknown
Attack Complexity (AC):
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Privileges Required (PR):
Unknown
User Interaction (UI):
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Scope (S):
Unknown
Confidentiality (C):
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Integrity (I):
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Availability (A):
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General Information

Offensive Application
Unknown
Utility Class
Unknown
Ports
Unknown
OS
Unknown
Vulnerable Versions
Linux b246759284d6
Linux not down converted
Prerequisites
Unknown
Discovered By
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PoC Author
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Metasploit Module
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Reporter
Unknown

Vendors

  • Linux

Products

  • Linux
Technical Analysis