Improper Locking Affecting linux-azure-6.12 package, versions <6.12.85-r2


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.12% (2nd percentile)

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  • Snyk IDSNYK-CHAINGUARDLATEST-LINUXAZURE612-16635111
  • published11 May 2026
  • disclosed6 May 2026

Introduced: 6 May 2026

CVE-2026-43127  (opens in a new tab)
CWE-667  (opens in a new tab)

How to fix?

Upgrade Chainguard linux-azure-6.12 to version 6.12.85-r2 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream linux-azure-6.12 package and not the linux-azure-6.12 package as distributed by Chainguard. See How to fix? for Chainguard relevant fixed versions and status.

In the Linux kernel, the following vulnerability has been resolved:

ntfs3: fix circular locking dependency in run_unpack_ex

Syzbot reported a circular locking dependency between wnd->rw_lock (sbi->used.bitmap) and ni->file.run_lock.

The deadlock scenario:

  1. ntfs_extend_mft() takes ni->file.run_lock then wnd->rw_lock.
  2. run_unpack_ex() takes wnd->rw_lock then tries to acquire ni->file.run_lock inside ntfs_refresh_zone().

This creates an AB-BA deadlock.

Fix this by using down_read_trylock() instead of down_read() when acquiring run_lock in run_unpack_ex(). If the lock is contended, skip ntfs_refresh_zone() - the MFT zone will be refreshed on the next MFT operation. This breaks the circular dependency since we never block waiting for run_lock while holding wnd->rw_lock.

CVSS Base Scores

version 3.1