Cloud Vulnerability DB
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Vulnerability DatabaseCVE-2022-49498
CVE-2022-49498:
Linux Kernel vulnerability analysis and mitigation
Overview
CVE-2022-49498 affects the Linux kernel's ALSA (Advanced Linux Sound Architecture) PCM subsystem. The vulnerability was discovered when a pointer substream was being dereferenced during the assignment of pointer card before performing a null check with the PCMRUNTIMECHECK macro (Kernel Git).
Technical details
The vulnerability exists in the sound/core/pcmmemory.c file where a potential null pointer dereference could occur. The issue specifically appears in the sndpcmlibfreepages function where the code was dereferencing substream->pcm->card before validating that substream was not null. Although the PCMRUNTIMECHECK macro includes a BUGON check, the code needed to perform the pointer validation before accessing the card pointer (Kernel Git).
Impact
If exploited, this vulnerability could lead to a null pointer dereference in the Linux kernel's sound subsystem, potentially causing system crashes or denial of service conditions (Kernel Git).
Mitigation and workarounds
The issue was fixed by moving the card pointer assignment after the null checks, ensuring proper validation before dereferencing the pointer. The fix was implemented in commit 011b559be832194f992f73d6c0d5485f5925a10b and backported to various stable kernel versions (Kernel Git).
Additional resources
Source: This report was generated using AI
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