CVE-2021-47511: Linux Kernel

Medium severity, CVSS 5.5. EPSS: 0.2% chance of exploitation in the next 30 days.

In the Linux kernel, the following vulnerability has been resolved: ALSA: pcm: oss: Fix negative period/buffer sizes The period size calculation in OSS layer may receive a negative value as an error, but the code there assumes only the positive values and handle them with size_t. Due to that, a too big value may be passed to the lower layers. This patch changes the code to handle with ssize_t and adds the proper error checks appropriately.

Affected products

• Linux Linux Kernel: before 4.4.295 (fixed in 4.4.295); from 4.5, before 4.9.293 (fixed in 4.9.293); from 4.10, before 4.14.258 (fixed in 4.14.258); from 4.15, before 4.19.221 (fixed in 4.19.221); from 4.20, before 5.4.165 (fixed in 5.4.165); from 5.5, before 5.10.85 (fixed in 5.10.85); …

Published 2024-05-24. Last modified 2026-06-17.