What’s Vulnerable › Vulnerabilities

CVE-2026-31496: netfilter: nf_conntrack_expect: skip expectations in other netns via proc

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-22 · updated 2026-10-15

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").

Affected products

• Linux kernel: from 2.6.28.1 before 6.1.168; from 6.2 before 6.6.131; from 6.7 before 6.12.80; from 6.13 before 6.18.21; from 6.19 before 6.19.11; 2.6.28, 7.0-rc1, 7.0-rc2, 7.0-rc3, 7.0-rc4, 7.0-rc5 (+2) — fixed in 6.1.168, 6.12.80, 6.18.21, 6.19.11, 6.6.131

How to fix

Upgrade to a fixed version: Linux kernel 6.1.168, 6.12.80, 6.18.21, 6.19.11. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/168145c87444619e3e649322bbe7719ecd00d411
• https://git.kernel.org/stable/c/2028405ea6987b4448784e439413202cfe19f43f
• https://git.kernel.org/stable/c/3265ad619987cb551edaf797ed056d80ac450225
• https://git.kernel.org/stable/c/3db5647984de03d9cae0dcddb509b058351f0ee4
• https://git.kernel.org/stable/c/9ca8c7452493d915f9bbf2f39331e6c583d07a23
• https://git.kernel.org/stable/c/dcfcd95b3ae7683e8ae55c92284b3430ce614bc7
• https://cert-portal.siemens.com/productcert/html/ssa-019113.html
• https://cert-portal.siemens.com/productcert/html/ssa-082556.html
• https://cert-portal.siemens.com/productcert/html/ssa-457936.html

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