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CVE-2021-46971
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CVE-2021-46971
MITRE ATT&CK
Collection
Command and Control
Credential Access
Defense Evasion
Discovery
Execution
Exfiltration
Impact
Initial Access
Lateral Movement
Persistence
Privilege Escalation
Topic Tags
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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General Information
Vendors
- Linux
Products
- Linux
References
Miscellaneous
Additional Info
Technical Analysis
Report as Exploited in the Wild
CVE ID
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