# CVE-2026-99132: xfs: don't hold buffer locks across sync transaction commit in xfs_sync_sb_buf

CVE-2026-99132 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-99132, released November 3, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-99132
- Priority: Routine
- CVSS: 5.5 (Moderate)
- EPSS: 0.0018
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 28, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-99132

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.12.115-2 | [DEBIAN-CVE-2026-99132](https://patchblox.com/security/data/fix/linux/debian-cve-2026-99132.md) | Nov 3, 2026 |
| Linux | linux Debian 14 | 7.2.13-1 | [DEBIAN-CVE-2026-99132](https://patchblox.com/security/data/fix/linux/debian-cve-2026-99132.md) | Nov 3, 2026 |

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Data as of 2026-11-09T01:18:40Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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