Cloud Vulnerability DB
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Vulnerability DatabaseCVE-2022-49832
CVE-2022-49832:
Linux Kernel vulnerability analysis and mitigation
Overview
A null pointer dereference vulnerability (CVE-2022-49832) was discovered in the Linux kernel's pinctrl devicetree subsystem. The vulnerability was identified in the pinctrldtto_map function and was disclosed on May 1, 2025. The issue affects the Linux kernel's pinctrl subsystem, specifically when handling device tree operations (NVD, Wiz).
Technical details
The vulnerability occurs when kasprintf() returns a NULL pointer due to kmalloc() allocation failure in the pinctrldttomap function. A KASAN bug report revealed a null pointer dereference in the strcmp+0x2e/0x50 function, with a read of size 1 at address 0000000000000000 by task python3/2640. The call trace shows the issue propagating through strcmp -> _offindproperty -> offindproperty -> pinctrldtto_map functions (NVD, Red Hat).
Impact
When triggered, this vulnerability can lead to system instability and potential denial of service conditions due to the null pointer dereference in the kernel's pinctrl subsystem (Wiz).
Mitigation and workarounds
The fix involves directly returning ENOMEM when kasprintf() returns a NULL pointer, preventing the null pointer dereference condition. Red Hat Enterprise Linux 9 has deferred the fix for both kernel and kernel-rt packages (Red Hat).
Additional resources
Source: This report was generated using AI
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