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Critical· 9.1official fix available

CVE-2026-46244

A flaw in the Linux kernel’s netfilter module could let attackers forge transport headers in IPv6 packets, potentially bypassing firewall rules. The issue was fixed in a kernel update that corrected a desynchronization bug. Users should update to a patched kernel version.

publishedJun 3, 2026
last modifiedJul 22, 2026
sourcesNVD
severity · cvss
9.1
critical · how bad it is
exploitation · epss
<1%
25th 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 24, 2026

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

01

Who is affected

Linux kernel 6.2 and later stable releases, including 7.1, on systems running netfilter (iptables/nftables).

02

Real-world impact

An attacker could craft IPv6 packets that appear to use a different protocol, such as TCP, allowing them to bypass firewall rules and potentially gain unauthorized network access.

03

Why this severity

The CVSS score of 9.1 reflects the high impact of being able to bypass firewall protections without authentication, combined with the low effort required to exploit the desynchronization bug.

04

What to do about it

official fix available
recommended steps
  1. 01Upgrade your Linux kernel to a version that includes the fix (e.g., 6.3 or later).
  2. 02Reboot the system to load the new kernel.

NVD description indicates the vulnerability has been resolved.

05

Timeline

  1. Jun 3, 2026 · Jun 3, 2026
    Published
    Disclosed and added to the National Vulnerability Database.
  2. Jul 22, 2026 · 13d ago
    Advisory updated
    The NVD record was last revised.
  3. Jul 25, 2026 · 10d 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 impactNone
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-2026-46244: A flaw in the Linux kernel’s netfilter module could let attackers forg · Vulnary