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Linux KernelOperating system · Linux

CVE-2025-39734

MEDIUM · 5.5 CVSS v3.1 Published 2025-09-07
Fix available
A fix is available. Upgrade to 5.15.190 / 6.1.148 or later.
See remediation →
57/100
Remediation priority · Elevated
Zero-click Patch available

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
In the Linux kernel, the following vulnerability has been resolved: Revert "fs/ntfs3: Replace inode_trylock with inode_lock" This reverts commit 69505fe98f198ee813898cbcaf6770949636430b. Initially, conditional lock acquisition was removed to fix an xfstest bug that was observed during internal testing. The deadlock reported by syzbot is resolved by reintroducing conditional acquisition. The xfstest bug no longer occurs on kernel version 6.16-rc1 during internal testing. I assume that changes in other modules may have contributed to this.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis

A detailed technical summary for this CVE is being prepared.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Linux KernelOperating system
Affected:>= 5.15.165, < 5.15.190>= 6.1.103, < 6.1.148>= 6.6.44, < 6.6.102>= 6.10.3, < 6.12.42>= 6.13, < 6.15.10>= 6.16, < 6.16.1
Debian LinuxOperating system
Affected:= 11.0

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 5.15.190 / 6.1.148 / 6.6.102 or later
Fixed in 5.15.1906.1.1486.6.102
Vendor patch git.kernel.org →
Recommended fix High confidence

Linux Kernel >= 5.15.190, >= 6.1.148, >= 6.6.102, or >= 6.12.42

  1. 1. Check current kernel version using 'uname -r'
  2. 2. Upgrade the Linux kernel to version 5.15.190 or higher (if using 5.15.x kernel)
  3. 3. OR upgrade to version 6.1.148 or higher (if using 6.1.x kernel)
  4. 4. OR upgrade to version 6.6.102 or higher (if using 6.6.x kernel)
  5. 5. OR upgrade to version 6.12.42 or higher (if using 6.10.x or 6.11.x kernel)
  6. 6. For Debian 11.0, apply the vendor security update for the kernel package
  7. 7. Reboot the system to load the fixed kernel
Caveat Kernel upgrades may require rebooting services; ensure compatibility with local system configuration before upgrading

Generated from the published advisory — verify against the referenced sources before acting.

We can perform the upgrade in your staging environment and verify nothing breaks — typical engagement from $1,600. Get the upgrade done

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2025-39734 in production — separate from our analysis above.

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What this is

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What belongs here
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  • Version or environment caveats, and links to real fixes
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