Improper Locking Affecting linux-virt package, versions <6.12.19-r0


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.01% (1st percentile)

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  • Snyk IDSNYK-MINIMOSLATEST-LINUXVIRT-13309810
  • published6 Oct 2025
  • disclosed1 Apr 2025

Introduced: 1 Apr 2025

CVE-2025-21900  (opens in a new tab)
CWE-667  (opens in a new tab)

How to fix?

Upgrade Minimos:latest linux-virt to version 6.12.19-r0 or higher.

NVD Description

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

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

NFSv4: Fix a deadlock when recovering state on a sillyrenamed file

If the file is sillyrenamed, and slated for delete on close, it is possible for a server reboot to triggeer an open reclaim, with can again race with the application call to close(). When that happens, the call to put_nfs_open_context() can trigger a synchronous delegreturn call which deadlocks because it is not marked as privileged.

Instead, ensure that the call to nfs4_inode_return_delegation_on_close() catches the delegreturn, and schedules it asynchronously.

CVSS Base Scores

version 3.1