CVE-2023-54072

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

ALSA: pcm: Fix potential data race at PCM memory allocation helpers

The PCM memory allocation helpers have a sanity check against too many

buffer allocations. However, the check is performed without a proper

lock and the allocation isn't serialized; this allows user to allocate

more memories than predefined max size.

Practically seen, this isn't really a big problem, as it's more or

less some "soft limit" as a sanity check, and it's not possible to

allocate unlimitedly. But it's still better to address this for more

consistent behavior.

The patch covers the size check in do_alloc_pages() with the

card->memory_mutex, and increases the allocated size there for

preventing the further overflow. When the actual allocation fails,

the size is decreased accordingly.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References