github - ghsa-rcvc-x6h8-mpp2

GHSA-RCVC-X6H8-MPP2

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:

s390/zcrypt: fix zcard and zqueue hot-unplug memleak

Tests with kvm and a kmemdebug kernel showed, that on hot unplug the zcard and zqueue structs for the unplugged card or queue are not properly freed because of a mismatch with get/put for the embedded kref counter.

This fix now adjusts the handling of the kref counters. With init the kref counter starts with 1. This initial value needs to drop to zero with the unregister of the card or queue to trigger the release and free the object.

Severity ?

5.5 (Medium)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2021-46968"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-401"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-02-27T19:04:07Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/zcrypt: fix zcard and zqueue hot-unplug memleak\n\nTests with kvm and a kmemdebug kernel showed, that on hot unplug the\nzcard and zqueue structs for the unplugged card or queue are not\nproperly freed because of a mismatch with get/put for the embedded\nkref counter.\n\nThis fix now adjusts the handling of the kref counters. With init the\nkref counter starts with 1. This initial value needs to drop to zero\nwith the unregister of the card or queue to trigger the release and\nfree the object.",
  "id": "GHSA-rcvc-x6h8-mpp2",
  "modified": "2025-01-08T18:30:40Z",
  "published": "2024-02-27T21:31:27Z",
  "references": [
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      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-46968"
    },
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      "url": "https://git.kernel.org/stable/c/026499a9c2e002e621ad568d1378324ae97e5524"
    },
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      "url": "https://git.kernel.org/stable/c/055a063a18bcd19b93709e3eac8078d6b2f04599"
    },
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      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
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}

CVE-2021-46968 (GCVE-0-2021-46968)

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: s390/zcrypt: fix zcard and zqueue hot-unplug memleak Tests with kvm and a kmemdebug kernel showed, that on hot unplug the zcard and zqueue structs for the unplugged card or queue are not properly freed because of a mismatch with get/put for the embedded kref counter. This fix now adjusts the handling of the kref counters. With init the kref counter starts with 1. This initial value needs to drop to zero with the unregister of the card or queue to trigger the release and free the object.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/026499a9c2e002e62…
	https://git.kernel.org/stable/c/055a063a18bcd19b9…
	https://git.kernel.org/stable/c/971dc8706cee47393…
	https://git.kernel.org/stable/c/70fac8088cfad9f3b…

Impacted products

Vendor

Product

Version

Linux

Affected: 29c2680fd2bf3862ff5cf2957f198512493156f9 , < 026499a9c2e002e621ad568d1378324ae97e5524 (git)
Affected: 29c2680fd2bf3862ff5cf2957f198512493156f9 , < 055a063a18bcd19b93709e3eac8078d6b2f04599 (git)
Affected: 29c2680fd2bf3862ff5cf2957f198512493156f9 , < 971dc8706cee47393d393905d294ea47e39503d3 (git)
Affected: 29c2680fd2bf3862ff5cf2957f198512493156f9 , < 70fac8088cfad9f3b379c9082832b4d7532c16c2 (git)

Linux

Affected: 5.10
Unaffected: 0 , < 5.10 (semver)
Unaffected: 5.10.36 , ≤ 5.10.* (semver)
Unaffected: 5.11.20 , ≤ 5.11.* (semver)
Unaffected: 5.12.3 , ≤ 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-RCVC-X6H8-MPP2

CVE-2021-46968 (GCVE-0-2021-46968)

Tags

Sightings

Nomenclature