github - ghsa-hmgx-rfwx-3mvq

GHSA-HMGX-RFWX-3MVQ

Vulnerability from github – Published: 2024-02-27 21:31 – Updated: 2025-01-08 18:30

Details

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 ?

3.3 (Low)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

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{
  "affected": [],
  "aliases": [
    "CVE-2021-46971"
  ],
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    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-02-27T19:04:07Z",
    "severity": "LOW"
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  "id": "GHSA-hmgx-rfwx-3mvq",
  "modified": "2025-01-08T18:30:40Z",
  "published": "2024-02-27T21:31:27Z",
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CVE-2021-46971 (GCVE-0-2021-46971)

Vulnerability from cvelistv5 – Published: 2024-02-27 18:47 – Updated: 2025-05-04 07:01

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.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/b246759284d6a2bc5…
	https://git.kernel.org/stable/c/4348d3b5027bc3ff6…
	https://git.kernel.org/stable/c/f5809ca4c311b71bf…
	https://git.kernel.org/stable/c/c7b0208ee370b89d2…
	https://git.kernel.org/stable/c/08ef1af4de5fe7de9…

Impacted products

Vendor

Product

Version

Linux

Affected: b0c8fdc7fdb77586c3d1937050925b960743306e , < b246759284d6a2bc5b6f1009caeeb3abce2ec9ff (git)
Affected: b0c8fdc7fdb77586c3d1937050925b960743306e , < 4348d3b5027bc3ff6336368b6c60605d4ef8e1ce (git)
Affected: b0c8fdc7fdb77586c3d1937050925b960743306e , < f5809ca4c311b71bfaba6d13f4e39eab0557895e (git)
Affected: b0c8fdc7fdb77586c3d1937050925b960743306e , < c7b0208ee370b89d20486fae71cd9abb759819c1 (git)
Affected: b0c8fdc7fdb77586c3d1937050925b960743306e , < 08ef1af4de5fe7de9c6d69f1e22e51b66e385d9b (git)

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)

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Sightings

Author	Source	Type	Date

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.

Action not permitted

GHSA-HMGX-RFWX-3MVQ

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

Tags

Sightings

Nomenclature