CVE-2022-49556

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2022-49556
In the Linux kernel, the following vulnerability has been resolved: KVM: SVM: Use kzalloc for sev ioctl interfaces to prevent kernel data leak For some sev ioctl interfaces, the length parameter that is passed maybe less than or equal to SEV_FW_BLOB_MAX_SIZE, but larger than the data that PSP firmware returns. In this case, kmalloc will allocate memory that is the size of the input rather than the size of the data. Since PSP firmware doesn't fully overwrite the allocated buffer, these sev ioctl interface may return uninitialized kernel slab memory.

7.1 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 5.2

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://git.kernel.org/stable/c/401bef1f95de92c3a8c6eece46e02fa88d7285ee Patch
https://git.kernel.org/stable/c/57a01725339f9d82b099102ba2751621b1caab93 Patch
https://git.kernel.org/stable/c/bbdcc644b59e01e98c68894a9fab42b9687f42b0 Patch
https://git.kernel.org/stable/c/d22d2474e3953996f03528b84b7f52cc26a39403 Patch
https://git.kernel.org/stable/c/d8fdb4b24097472ff6b3c0559448200d420b1418 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:*:*:*:*:*:*:*:*
History

22 Jan 2026, 20:55

Type Values Removed Values Added
First Time Linux
Linux linux Kernel
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: KVM: SVM: Usar kzalloc para interfaces sev ioctl para evitar fugas de datos del kernel Para algunas interfaces sev ioctl, el parámetro de longitud que se pasa puede ser menor o igual a SEV_FW_BLOB_MAX_SIZE, pero mayor que los datos que devuelve el firmware de PSP. En este caso, kmalloc asignará memoria que sea del tamaño de la entrada en lugar del tamaño de los datos. Dado que el firmware de PSP no sobrescribe por completo el búfer asignado, estas interfaces sev ioctl pueden devolver memoria de losa de kernel no inicializada.
CWE NVD-CWE-noinfo
References () https://git.kernel.org/stable/c/401bef1f95de92c3a8c6eece46e02fa88d7285ee - () https://git.kernel.org/stable/c/401bef1f95de92c3a8c6eece46e02fa88d7285ee - Patch
References () https://git.kernel.org/stable/c/57a01725339f9d82b099102ba2751621b1caab93 - () https://git.kernel.org/stable/c/57a01725339f9d82b099102ba2751621b1caab93 - Patch
References () https://git.kernel.org/stable/c/bbdcc644b59e01e98c68894a9fab42b9687f42b0 - () https://git.kernel.org/stable/c/bbdcc644b59e01e98c68894a9fab42b9687f42b0 - Patch
References () https://git.kernel.org/stable/c/d22d2474e3953996f03528b84b7f52cc26a39403 - () https://git.kernel.org/stable/c/d22d2474e3953996f03528b84b7f52cc26a39403 - Patch
References () https://git.kernel.org/stable/c/d8fdb4b24097472ff6b3c0559448200d420b1418 - () https://git.kernel.org/stable/c/d8fdb4b24097472ff6b3c0559448200d420b1418 - Patch
CPE cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 7.1

26 Feb 2025, 07:01

Type Values Removed Values Added
New CVE
Information

Published : 2025-02-26 07:01

Updated : 2026-01-22 20:55

NVD link : CVE-2022-49556

Mitre link : CVE-2022-49556

CVE.ORG link : CVE-2022-49556

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
NVD-CWE-noinfo