Cloud Vulnerability DB
An open project to list all known cloud vulnerabilities and Cloud Service Provider security issues
Vulnerability DatabaseCVE-2022-49448
CVE-2022-49448:
Linux Kernel vulnerability analysis and mitigation
Overview
CVE-2022-49448 affects the Linux kernel's BCM (Broadcom) Power Management Block (PMB) driver. The vulnerability was discovered in the soc/bcm component where a potential NULL pointer dereference could occur due to an unchecked return value from devm_kzalloc(). This issue was identified and resolved in 2022, with the fix being committed to the Linux kernel repository (Kernel Git).
Technical details
The vulnerability exists in the bcm-pmb.c driver file where the devmkzalloc() function's return value was not being checked for NULL. If the memory allocation fails, subsequent code accessing 'pd->pmb' could trigger a null pointer dereference. The issue was fixed by adding a NULL check after the devmkzalloc() call and returning -ENOMEM if the allocation fails (Kernel Git).
Impact
If exploited, this vulnerability could lead to a null pointer dereference in the Linux kernel's BCM PMB driver, potentially causing a system crash or denial of service condition (NVD).
Mitigation and workarounds
The issue has been fixed by adding proper NULL pointer checking after the devm_kzalloc() call. The fix was implemented in commit b4bd2aafacce48db26b0a213d849818d940556dd and has been backported to various stable kernel versions (Kernel Git).
Additional resources
Source: This report was generated using AI
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