Vulnary
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Critical· 9.8official fix available

CVE-2025-39932

A bug in the Linux kernel’s SMB client caused a race condition that could crash the system. The issue was fixed by disabling pending work during SMB client destruction. The fix is now included in recent kernel releases.

publishedOct 4, 2025
last modifiedJul 30, 2026
sourcesNVD
severity · cvss
9.8
critical · how bad it is
exploitation · epss
<1%
19th percentile · chance of exploitation in 30 days
(ai-assisted) A model wrote this summary from the official data, so double-check it against the source before you act on it. Read the official advisory →
auto-deletes from the system
counting…on Aug 29, 2026

An official fix is available, so this entry is kept for 30 days and then removed automatically.

01

Who is affected

Linux kernel, particularly version 6.17 and later.

02

Real-world impact

An attacker could trigger the race condition to crash the kernel, leading to a denial‑of‑service or potentially allowing further exploitation if the crash is leveraged.

03

Why this severity

The CVSS score of 9.8 reflects that the flaw can be triggered remotely, requires no user interaction, and can completely compromise confidentiality, integrity, and availability.

04

What to do about it

official fix available
recommended steps
  1. 01Update the Linux kernel to a version that includes the fix (e.g., 6.17 or later).
  2. 02Reboot the system to load the updated kernel.

NVD-referenced vendor advisory

05

Timeline

  1. Oct 4, 2025 · Oct 4, 2025
    Published
    Disclosed and added to the National Vulnerability Database.
  2. Jul 30, 2026 · 6d ago
    Advisory updated
    The NVD record was last revised.
  3. Jul 30, 2026 · 6d ago
    Official fix available
    A vendor patch or mitigation now exists — see the remediation steps above.
06

How it’s attacked

Attack vectorNetwork (remote)
Attack complexityLow
Privileges requiredNone
User interactionNone needed
ScopeUnchanged
Confidentiality impactHigh
Integrity impactHigh
Availability impactHigh
07

References & advisories

NVD advisory ↗Search advisories ↗
(ai-assisted) A model wrote this summary from the official data, so double-check it against the source before you act on it. Read the official advisory →