CVE-2021-47511

MEDIUM
Published May 24, 2024 Modified Sep 29, 2025

Description

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.

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CVSS v3.1 Score

5.5
MEDIUM
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected Products

Vendor Product
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel

References

Advisories & Patches

https://git.kernel.org/stable/c/00a860678098fcd9fa8db2b5fb9d2ddf4776d4cc https://git.kernel.org/stable/c/02b2b691b77cd7b951fa7b6c9d44d4e472cdc823 https://git.kernel.org/stable/c/502e1146873d870f87da3b8f93d6bf2de5f38d0c https://git.kernel.org/stable/c/8af815ab052eaf74addbbfb556d63ce2137c0e1b https://git.kernel.org/stable/c/9d2479c960875ca1239bcb899f386970c13d9cfe https://git.kernel.org/stable/c/be8869d388593e57223ad39297c8e54be632f2f2 https://git.kernel.org/stable/c/f12c8a7515f641885677960af450082569a87243 https://git.kernel.org/stable/c/f96c0959c1ee92adc911c10d6ec209af50105049 https://git.kernel.org/stable/c/00a860678098fcd9fa8db2b5fb9d2ddf4776d4cc https://git.kernel.org/stable/c/02b2b691b77cd7b951fa7b6c9d44d4e472cdc823 https://git.kernel.org/stable/c/502e1146873d870f87da3b8f93d6bf2de5f38d0c https://git.kernel.org/stable/c/8af815ab052eaf74addbbfb556d63ce2137c0e1b https://git.kernel.org/stable/c/9d2479c960875ca1239bcb899f386970c13d9cfe https://git.kernel.org/stable/c/be8869d388593e57223ad39297c8e54be632f2f2 https://git.kernel.org/stable/c/f12c8a7515f641885677960af450082569a87243 https://git.kernel.org/stable/c/f96c0959c1ee92adc911c10d6ec209af50105049

Frequently Asked Questions

What is CVE-2021-47511? +
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. It has a CVSS v3.1 base score of 5.5 (MEDIUM).
How severe is CVE-2021-47511? +
CVE-2021-47511 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.
What products are affected by CVE-2021-47511? +
CVE-2021-47511 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.
How do I check if I'm vulnerable to CVE-2021-47511? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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