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Critical· 9.8official fix available

CVE-2026-43037

This vulnerability allows an attacker to trigger a buffer overflow in the Linux kernel’s IPv6 tunnel handling, potentially leading to arbitrary code execution. It occurs when the kernel misinterprets packet data during error handling, enabling an overflow of a fixed‑size stack buffer. The issue has been fixed by clearing a control buffer and adding header validation.

publishedMay 1, 2026
last modifiedJul 29, 2026
sourcesNVD
severity · cvss
9.8
critical · how bad it is
exploitation · epss
<1%
44th 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

All Linux kernel users running versions prior to the fix, notably kernel 7.0 and earlier, are affected. This includes typical users running standard Linux distributions.

02

Real-world impact

An attacker could cause the kernel to crash or execute arbitrary code with kernel privileges, compromising the entire system.

03

Why this severity

The CVSS score of 9.8 reflects the lack of authentication or user interaction required, the high impact on confidentiality, integrity, and availability, and the presence of a buffer overflow that can lead to arbitrary code execution.

04

What to do about it

official fix available
recommended steps
  1. 01Verify the current kernel version.
  2. 02Upgrade to a kernel version that includes the fix (e.g., Linux kernel 7.0 or later).
  3. 03Reboot the system to load the updated kernel.

NVD description

05

Timeline

  1. May 1, 2026 · May 1, 2026
    Published
    Disclosed and added to the National Vulnerability Database.
  2. Jul 20, 2026 · 16d ago
    Official fix available
    A vendor patch or mitigation now exists — see the remediation steps above.
  3. Jul 29, 2026 · 7d ago
    Advisory updated
    The NVD record was last revised.
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 →