CVE-2021-46971 (GCVE-0-2021-46971)

Vulnerability from cvelistv5 – Published: 2024-02-27 18:47 – Updated: 2026-05-11 13:45
VLAI
Title
perf/core: Fix unconditional security_locked_down() call
Summary
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.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: b0c8fdc7fdb77586c3d1937050925b960743306e , < b246759284d6a2bc5b6f1009caeeb3abce2ec9ff (git)
Affected: b0c8fdc7fdb77586c3d1937050925b960743306e , < 4348d3b5027bc3ff6336368b6c60605d4ef8e1ce (git)
Affected: b0c8fdc7fdb77586c3d1937050925b960743306e , < f5809ca4c311b71bfaba6d13f4e39eab0557895e (git)
Affected: b0c8fdc7fdb77586c3d1937050925b960743306e , < c7b0208ee370b89d20486fae71cd9abb759819c1 (git)
Affected: b0c8fdc7fdb77586c3d1937050925b960743306e , < 08ef1af4de5fe7de9c6d69f1e22e51b66e385d9b (git)
Create a notification for this product.
Linux Linux Affected: 5.4
Unaffected: 0 , < 5.4 (semver)
Unaffected: 5.4.117 , ≤ 5.4.* (semver)
Unaffected: 5.10.35 , ≤ 5.10.* (semver)
Unaffected: 5.11.19 , ≤ 5.11.* (semver)
Unaffected: 5.12.2 , ≤ 5.12.* (semver)
Unaffected: 5.13 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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Solucione este problema verificando sample_type primero y solo llamando al gancho cuando se respete su 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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2025-11-21T14:05:23+00:00",
      "cve": "CVE-2021-46971",
      "id": "CVE-2021-46971",
      "initial_release_date": "2021-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: perf/core: Fix unconditional security_locked_down() call",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-46971.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-06-06T06:08:57Z",
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      "initial_release_date": "2024-03-01T04:08:03Z",
      "product_status:known_affected": "376",
      "product_status:known_not_affected": "191",
      "product_status:recommended": "137",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2021-46971",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-46971.json",
      "version": "36"
    },
    "vulnrichment": {
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      "cveMetadata": "{\"cveId\": \"CVE-2021-46971\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T07:01:25.834Z\", \"dateReserved\": \"2024-02-27T18:42:55.943Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-02-27T18:47:06.674Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
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    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.