CVE-2021-46968

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2021-46968
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.

5.5 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://git.kernel.org/stable/c/026499a9c2e002e621ad568d1378324ae97e5524 Patch
https://git.kernel.org/stable/c/055a063a18bcd19b93709e3eac8078d6b2f04599 Patch
https://git.kernel.org/stable/c/70fac8088cfad9f3b379c9082832b4d7532c16c2 Patch
https://git.kernel.org/stable/c/971dc8706cee47393d393905d294ea47e39503d3 Patch
https://git.kernel.org/stable/c/026499a9c2e002e621ad568d1378324ae97e5524 Patch
https://git.kernel.org/stable/c/055a063a18bcd19b93709e3eac8078d6b2f04599 Patch
https://git.kernel.org/stable/c/70fac8088cfad9f3b379c9082832b4d7532c16c2 Patch
https://git.kernel.org/stable/c/971dc8706cee47393d393905d294ea47e39503d3 Patch
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
History

08 Jan 2025, 16:50

Type Values Removed Values Added
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
First Time Linux
Linux linux Kernel
CPE cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
References () https://git.kernel.org/stable/c/026499a9c2e002e621ad568d1378324ae97e5524 - () https://git.kernel.org/stable/c/026499a9c2e002e621ad568d1378324ae97e5524 - Patch
References () https://git.kernel.org/stable/c/055a063a18bcd19b93709e3eac8078d6b2f04599 - () https://git.kernel.org/stable/c/055a063a18bcd19b93709e3eac8078d6b2f04599 - Patch
References () https://git.kernel.org/stable/c/70fac8088cfad9f3b379c9082832b4d7532c16c2 - () https://git.kernel.org/stable/c/70fac8088cfad9f3b379c9082832b4d7532c16c2 - Patch
References () https://git.kernel.org/stable/c/971dc8706cee47393d393905d294ea47e39503d3 - () https://git.kernel.org/stable/c/971dc8706cee47393d393905d294ea47e39503d3 - Patch
CWE CWE-401

21 Nov 2024, 06:35

Type Values Removed Values Added
References () https://git.kernel.org/stable/c/026499a9c2e002e621ad568d1378324ae97e5524 - () https://git.kernel.org/stable/c/026499a9c2e002e621ad568d1378324ae97e5524 -
References () https://git.kernel.org/stable/c/055a063a18bcd19b93709e3eac8078d6b2f04599 - () https://git.kernel.org/stable/c/055a063a18bcd19b93709e3eac8078d6b2f04599 -
References () https://git.kernel.org/stable/c/70fac8088cfad9f3b379c9082832b4d7532c16c2 - () https://git.kernel.org/stable/c/70fac8088cfad9f3b379c9082832b4d7532c16c2 -
References () https://git.kernel.org/stable/c/971dc8706cee47393d393905d294ea47e39503d3 - () https://git.kernel.org/stable/c/971dc8706cee47393d393905d294ea47e39503d3 -

28 Feb 2024, 14:06

Type Values Removed Values Added
Summary
  • (es) En el kernel de Linux, se resolvió 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 están liberado correctamente debido a una discrepancia con get/put para el contador kref integrado. Esta solución 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 cancelación del registro de la tarjeta o cola para activar la liberación y liberar el objeto.

27 Feb 2024, 19:04

Type Values Removed Values Added
New CVE
Information

Published : 2024-02-27 19:04

Updated : 2025-01-08 16:50

NVD link : CVE-2021-46968

Mitre link : CVE-2021-46968

CVE.ORG link : CVE-2021-46968

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-401

Missing Release of Memory after Effective Lifetime