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CVE-2026-23459

8.2 · HIGH

In the Linux kernel, the following vulnerability has been resolved: ip_tunnel: adapt iptunnel_xmit_stats() to NETDEV_PCPU_STAT_DSTATS Blamed commits forgot that vxlan/geneve use udp_tunnel[6]_xmi…

Published Apr 3, 2026EPSS 0.40%

Overview

CVE-2026-23459 is a high-severity vulnerability. It was published on April 3, 2026 and has a CVSS 3.1 base score of 8.2 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.2, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

ip_tunnel: adapt iptunnel_xmit_stats() to NETDEV_PCPU_STAT_DSTATS

Blamed commits forgot that vxlan/geneve use udp_tunnel[6]_xmit_skb() which

call iptunnel_xmit_stats().

iptunnel_xmit_stats() was assuming tunnels were only using

NETDEV_PCPU_STAT_TSTATS.

@syncp offset in pcpu_sw_netstats and pcpu_dstats is different.

32bit kernels would either have corruptions or freezes if the syncp

sequence was overwritten.

This patch also moves pcpu_stat_type closer to dev->{t,d}stats to avoid

a potential cache line miss since iptunnel_xmit_stats() needs to read it.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/0d087d00161f562d5047cc4009bb0c6a19daf9f1Refgit.kernel.org/stable/c/8431c602f551549f082bbfa67f3003f2d8e3e132Refgit.kernel.org/stable/c/e40e2d11ced8119d3e4469ebe91264bc1cf71530

How CyberStrike helps

Frequently asked questions

What is CVE-2026-23459?

CVE-2026-23459 is a high-severity vulnerability. It was published on April 3, 2026 and has a CVSS 3.1 base score of 8.2 (HIGH).

How severe is CVE-2026-23459?

This vulnerability has a CVSS 3.1 base score of 8.2, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-23459?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-23459?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-23459 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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