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Critical· 9.8official fix available

CVE-2026-64385

A critical double‑free bug in the Linux kernel’s SMB client could let an attacker crash the system. The issue has been fixed in a kernel update.

publishedJul 25, 2026
last modifiedJul 27, 2026
sourcesNVD
severity · cvss
9.8
critical · how bad it is
exploitation · epss
<1%
37th 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 26, 2026

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

01

Who is affected

Linux kernel users, especially those running SMB client services. The specific kernel versions are not listed, but any kernel containing the vulnerable SMB2_ioctl() code is affected.

02

Real-world impact

An attacker could crash the kernel, causing a denial of service. The bug does not allow direct code execution or data theft.

03

Why this severity

The CVSS score of 9.8 reflects the high impact of a kernel crash (complete loss of confidentiality, integrity, and availability) combined with no authentication or user interaction required.

04

What to do about it

official fix available
recommended steps
  1. 01Update the Linux kernel to a version that contains the fix for CVE-2026-64385.

NVD-referenced vendor advisory

05

Timeline

  1. Jul 25, 2026 · 7d ago
    Published
    Disclosed and added to the National Vulnerability Database.
  2. Jul 27, 2026 · 5d 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 →
CVE-2026-64385: A critical double‑free bug in the Linux kernel’s SMB client could let · Vulnary