FKIE_CVE-2021-46968

Vulnerability from fkie_nvd - Published: 2024-02-27 19:04 - Updated: 2025-01-08 16:50
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/026499a9c2e002e621ad568d1378324ae97e5524Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/055a063a18bcd19b93709e3eac8078d6b2f04599Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/70fac8088cfad9f3b379c9082832b4d7532c16c2Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/971dc8706cee47393d393905d294ea47e39503d3Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/026499a9c2e002e621ad568d1378324ae97e5524Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/055a063a18bcd19b93709e3eac8078d6b2f04599Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/70fac8088cfad9f3b379c9082832b4d7532c16c2Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/971dc8706cee47393d393905d294ea47e39503d3Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "A3C0C655-F217-444C-9131-45D82FAF3CFF",
              "versionEndExcluding": "5.10.36",
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: s390/zcrypt: corrige zcard y zqueue hot-unplug memleak Las pruebas con kvm y un kernel kmemdebug mostraron que, al desconectar en caliente, las estructuras zcard y zqueue para la tarjeta o cola desconectada no est\u00e1n liberado correctamente debido a una discrepancia con get/put para el contador kref integrado. Esta soluci\u00f3n ahora ajusta el manejo de los contadores kref. Con init, el contador kref comienza con 1. Este valor inicial debe caer a cero con la cancelaci\u00f3n del registro de la tarjeta o cola para activar la liberaci\u00f3n y liberar el objeto."
    }
  ],
  "id": "CVE-2021-46968",
  "lastModified": "2025-01-08T16:50:33.063",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
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        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
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  "published": "2024-02-27T19:04:07.217",
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  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "description": [
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          "lang": "en",
          "value": "CWE-401"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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