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CVE-2026-100070

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_nat_sip: rewind offset when NAT shrinks the packet sashiko says: If map_addr() changes the packet length, such a…

Published Sep 25, 2026linuxEPSS 0.11%

Overview

CVE-2026-100070 is a medium-severity vulnerability affecting linux linux_kernel. It was published on September 25, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

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

netfilter: nf_nat_sip: rewind offset when NAT shrinks the packet

sashiko says:

If map_addr() changes the packet length, such as when the public NAT IP

string is shorter or longer than the internal IP, coff will still point to

the offset relative to the pre-mangled packet.

If the packet shrinks, coff could overshoot the correct position,

potentially causing the next ct_sip_parse_header_uri() call to silently

skip bytes and miss subsequent Contact headers. Could this lead to a

failure to NAT those subsequent headers and leak internal network details?

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. 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.

Affected products

VendorProductVersionsStatus
linuxlinux_kernel>= 2.6.26, < 5.10.270Affected

References

Refgit.kernel.org/stable/c/0f4d30e2e49f343fc28ba1e259fd22969b940c46Refgit.kernel.org/stable/c/16aecbe3036f6097c26b51b12e4c1cf207769690Refgit.kernel.org/stable/c/2703f5ea8d85bc729f433ac09ee902084c947122Refgit.kernel.org/stable/c/668cc1c30caedc63070b10d17d5514748988a140Refgit.kernel.org/stable/c/6828aca3d82717c2fda92af81c0dda642bc2b465Refgit.kernel.org/stable/c/810da5a63549531da78348b0a4545042d84e01e2Refgit.kernel.org/stable/c/c408d416618ebb8a95e3097a13f3b793ea9272eeRefgit.kernel.org/stable/c/e70d48fcf8382581162608a4a322919bfd22aef3

How CyberStrike helps

Frequently asked questions

What is CVE-2026-100070?

CVE-2026-100070 is a medium-severity vulnerability affecting linux linux_kernel. It was published on September 25, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-100070?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-100070?

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. 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-2026-100070?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-100070 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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