CVE-2022-49989

  1. Yack CVE
  2. Vulnerabilities (CVE)
  3. CVE-2022-49989

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

I

n the Linux kernel, the following vulnerability has been resolved: xen/privcmd: fix error exit of privcmd_ioctl_dm_op() The error exit of privcmd_ioctl_dm_op() is calling unlock_pages() potentially with pages being NULL, leading to a NULL dereference. Additionally lock_pages() doesn't check for pin_user_pages_fast() having been completely successful, resulting in potentially not locking all pages into memory. This could result in sporadic failures when using the related memory in user mode. Fix all of that by calling unlock_pages() always with the real number of pinned pages, which will be zero in case pages being NULL, and by checking the number of pages pinned by pin_user_pages_fast() matching the expected number of pages.

References
Link Resource
https://git.kernel.org/stable/c/45d47bd9b96e7874b98dbcc7602fe2826c5d62a6 Patch
https://git.kernel.org/stable/c/6de50db104af0dc921f593fd95c55db86a52ceef Patch
https://git.kernel.org/stable/c/c2b7bae7c90051fd6a679d5dee00400d67ebbf4a Patch
https://git.kernel.org/stable/c/c5deb27895e017a0267de0a20d140ad5fcc55a54 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:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.0:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.0:rc2:*:*:*:*:*:*
History

14 Nov 2025, 18:12

Type Values Removed Values Added
First Time Linux linux Kernel
Linux
CWE CWE-476
CPE cpe:2.3:o:linux:linux_kernel:6.0:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.0:rc1:*:*:*:*:*:*
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
References () https://git.kernel.org/stable/c/45d47bd9b96e7874b98dbcc7602fe2826c5d62a6 - () https://git.kernel.org/stable/c/45d47bd9b96e7874b98dbcc7602fe2826c5d62a6 - Patch
References () https://git.kernel.org/stable/c/6de50db104af0dc921f593fd95c55db86a52ceef - () https://git.kernel.org/stable/c/6de50db104af0dc921f593fd95c55db86a52ceef - Patch
References () https://git.kernel.org/stable/c/c2b7bae7c90051fd6a679d5dee00400d67ebbf4a - () https://git.kernel.org/stable/c/c2b7bae7c90051fd6a679d5dee00400d67ebbf4a - Patch
References () https://git.kernel.org/stable/c/c5deb27895e017a0267de0a20d140ad5fcc55a54 - () https://git.kernel.org/stable/c/c5deb27895e017a0267de0a20d140ad5fcc55a54 - Patch
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: xen/privcmd: corrección del error de salida de privcmd_ioctl_dm_op(). La salida de error de privcmd_ioctl_dm_op() está llamando a unlock_pages() potencialmente con páginas NULL, lo que lleva a una desreferencia NULL. Además, lock_pages() no comprueba si pin_user_pages_fast() ha sido completamente exitoso, lo que resulta en que potencialmente no se bloqueen todas las páginas en la memoria. Esto podría resultar en fallos esporádicos al usar la memoria relacionada en modo de usuario. Corrija todo esto llamando a unlock_pages() siempre con el número real de páginas ancladas, que será cero en caso de que pages sea NULL, y comprobando que el número de páginas ancladas por pin_user_pages_fast() coincida con el número esperado de páginas.

18 Jun 2025, 11:15

Type Values Removed Values Added
New CVE
Information

Published : 2025-06-18 11:15

Updated : 2025-11-14 18:12

NVD link : CVE-2022-49989

Mitre link : CVE-2022-49989

CVE.ORG link : CVE-2022-49989

JSON object : View

Products Affected

linux

CWE
CWE-476

NULL Pointer Dereference