CVE-2022-49726

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2022-49726
In the Linux kernel, the following vulnerability has been resolved: clocksource: hyper-v: unexport __init-annotated hv_init_clocksource() EXPORT_SYMBOL and __init is a bad combination because the .init.text section is freed up after the initialization. Hence, modules cannot use symbols annotated __init. The access to a freed symbol may end up with kernel panic. modpost used to detect it, but it has been broken for a decade. Recently, I fixed modpost so it started to warn it again, then this showed up in linux-next builds. There are two ways to fix it: - Remove __init - Remove EXPORT_SYMBOL I chose the latter for this case because the only in-tree call-site, arch/x86/kernel/cpu/mshyperv.c is never compiled as modular. (CONFIG_HYPERVISOR_GUEST is boolean)

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/0414eab7c78f3518143d383e448d44fc573ac6d2 Patch
https://git.kernel.org/stable/c/245b993d8f6c4e25f19191edfbd8080b645e12b1 Patch
https://git.kernel.org/stable/c/937fcbb55a1e48a6422e87e8f49422c92265f102 Patch
https://git.kernel.org/stable/c/cff3a7ce6e81418b6e8bac941779bbf5d342d626 Patch
https://git.kernel.org/stable/c/db965e2757d95f695e606856418cd84003dd036d 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:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19:rc2:*:*:*:*:*:*
History

24 Oct 2025, 18:52

Type Values Removed Values Added
CWE CWE-908
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: clocksource: hyper-v: unexport __init-annotated hv_init_clocksource() EXPORT_SYMBOL y __init es una mala combinación porque la sección .init.text se libera después de la inicialización. Por lo tanto, los módulos no pueden usar símbolos anotados __init. El acceso a un símbolo liberado puede terminar con un pánico del kernel. modpost solía detectarlo, pero ha estado roto durante una década. Recientemente, arreglé modpost para que comenzara a advertirlo nuevamente, luego apareció en las compilaciones de linux-next. Hay dos formas de solucionarlo: - Eliminar __init - Eliminar EXPORT_SYMBOL Elegí la última para este caso porque el único sitio de llamada en el árbol, arch/x86/kernel/cpu/mshyperv.c nunca se compila como modular. (CONFIG_HYPERVISOR_GUEST es booleano)
References () https://git.kernel.org/stable/c/0414eab7c78f3518143d383e448d44fc573ac6d2 - () https://git.kernel.org/stable/c/0414eab7c78f3518143d383e448d44fc573ac6d2 - Patch
References () https://git.kernel.org/stable/c/245b993d8f6c4e25f19191edfbd8080b645e12b1 - () https://git.kernel.org/stable/c/245b993d8f6c4e25f19191edfbd8080b645e12b1 - Patch
References () https://git.kernel.org/stable/c/937fcbb55a1e48a6422e87e8f49422c92265f102 - () https://git.kernel.org/stable/c/937fcbb55a1e48a6422e87e8f49422c92265f102 - Patch
References () https://git.kernel.org/stable/c/cff3a7ce6e81418b6e8bac941779bbf5d342d626 - () https://git.kernel.org/stable/c/cff3a7ce6e81418b6e8bac941779bbf5d342d626 - Patch
References () https://git.kernel.org/stable/c/db965e2757d95f695e606856418cd84003dd036d - () https://git.kernel.org/stable/c/db965e2757d95f695e606856418cd84003dd036d - Patch
CPE cpe:2.3:o:linux:linux_kernel:5.19:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19:rc1:*:*:*:*:*:*
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
First Time Linux
Linux linux Kernel

26 Feb 2025, 07:01

Type Values Removed Values Added
New CVE
Information

Published : 2025-02-26 07:01

Updated : 2025-10-24 18:52

NVD link : CVE-2022-49726

Mitre link : CVE-2022-49726

CVE.ORG link : CVE-2022-49726

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-908

Use of Uninitialized Resource