CVE-2021-46971
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2021-46971
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-46971.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2021-46971
- Related
- Published
- 2024-02-27T19:04:07Z
- Modified
- 2024-09-18T01:00:20Z
- Summary
- [none]
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
perf/core: Fix unconditional securitylockeddown() call
Currently, the lockdown state is queried unconditionally, even though its result is used only if the PERFSAMPLEREGSINTR bit is set in attr.sampletype. 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
-
- https://git.kernel.org/stable/c/08ef1af4de5fe7de9c6d69f1e22e51b66e385d9b
- https://git.kernel.org/stable/c/4348d3b5027bc3ff6336368b6c60605d4ef8e1ce
- https://git.kernel.org/stable/c/b246759284d6a2bc5b6f1009caeeb3abce2ec9ff
- https://git.kernel.org/stable/c/c7b0208ee370b89d20486fae71cd9abb759819c1
- https://git.kernel.org/stable/c/f5809ca4c311b71bfaba6d13f4e39eab0557895e
- https://security-tracker.debian.org/tracker/CVE-2021-46971
Affected packages
Debian:11 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source
Debian:12 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source
Debian:13 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source