CVE-2023-54072

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux95b30a4312545f2dde9db12bf6a425f35d5a0d77 < 7e1d1456c8db9949459c5a24e8845cfe92430b0faffected
LinuxLinuxd4cfb30fce03093ad944e0b44bd8f40bdad5330e < 7e11c58b2620a22c67a5ae28d64ce383890ee9f4affected
LinuxLinuxd4cfb30fce03093ad944e0b44bd8f40bdad5330e < a0ab49e7a758b488b2090171a75d50735c0876f6affected
LinuxLinuxd4cfb30fce03093ad944e0b44bd8f40bdad5330e < 3eb4e47a94e3f76521d7d344696db61e6a9619c7affected
LinuxLinuxd4cfb30fce03093ad944e0b44bd8f40bdad5330e < 773ccad902f67583a58b5650a2f8d8daf2e76facaffected
LinuxLinuxd4cfb30fce03093ad944e0b44bd8f40bdad5330e < bd55842ed998a622ba6611fe59b3358c9f76773daffected
LinuxLinux5.6affected
LinuxLinux0 < 5.6unaffected
LinuxLinux5.10.193 <= 5.10.*unaffected
LinuxLinux5.15.129 <= 5.15.*unaffected
LinuxLinux6.1.39 <= 6.1.*unaffected
LinuxLinux6.4.4 <= 6.4.*unaffected
LinuxLinux6.5 <= *unaffected

Weaknesses

References