Vulnary
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Critical· 9.8official fix available

CVE-2026-31607

A flaw in the Linux kernel’s USB/IP client allows a malicious server to send a response with an inflated packet count, causing a heap out‑of‑bounds write. The issue can lead to arbitrary code execution or a system crash. It has been fixed by validating the packet count before overwriting it.

publishedApr 24, 2026
last modifiedJul 20, 2026
sourcesNVD
severity · cvss
9.8
critical · how bad it is
exploitation · epss
<1%
24th 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 19, 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 running the USB/IP client component, especially those on older kernel versions before the patch. System administrators and users who enable USB/IP on their machines are typical affected parties.

02

Real-world impact

An attacker who controls a USB/IP server could trigger the client to write beyond its allocated memory, potentially allowing the attacker to execute arbitrary code, gain elevated privileges, or cause a denial of service.

03

Why this severity

The CVSS score of 9.8 reflects that the vulnerability can be exploited remotely without authentication or user interaction, and that it compromises confidentiality, integrity, and availability of the affected system.

04

What to do about it

official fix available
recommended steps
  1. 01Upgrade your Linux kernel to a version that includes the CVE-2026-31607 fix.
  2. 02Reboot the system to load the new kernel.

NVD description

05

Timeline

  1. Apr 24, 2026 · Apr 24, 2026
    Published
    Disclosed and added to the National Vulnerability Database.
  2. Jul 20, 2026 · 16d ago
    Advisory updated
    The NVD record was last revised.
  3. Jul 20, 2026 · 16d 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 →