CVE-2021-46971

LOW EPSS 13.8%
Published Feb 27, 20242y ago · Modified Jun 17, 20262w ago
3.3 CVSS 3.1
Low
Find Similar
Published Feb 27, 2024 2y ago
Last Modified Jun 17, 2026 2w ago

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 Details

Base Score
3.3
Exploitability
1.8
Impact
1.4
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity Low
Availability None

Threat Intelligence

EPSS Exploit Probability
13.8% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Affected Products 4

VendorProductVersionRange
linuxlinux_kernel*≥5.4  –  <5.4.117
linuxlinux_kernel*≥5.5  –  <5.10.35
linuxlinux_kernel*≥5.11  –  <5.11.19
linuxlinux_kernel*≥5.12  –  <5.12.2

References 5

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

Remediation

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