Medium 5.5Published Apr 22, 2026

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

Updated under an hour ago (Oct 27, 2026, 2:23 AM ET)

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It affects Linux and 4 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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").

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 9b03f38d0487f3908696242286d934c9b38f9d2a before 2028405ea6987b4448784e439413202cfe19f43f; from 9b03f38d0487f3908696242286d934c9b38f9d2a before 168145c87444619e3e649322bbe7719ecd00d411; from 9b03f38d0487f3908696242286d934c9b38f9d2a before dcfcd95b3ae7683e8ae55c92284b3430ce614bc7; from 9b03f38d0487f3908696242286d934c9b38f9d2a before 9ca8c7452493d915f9bbf2f39331e6c583d07a23; from 9b03f38d0487f3908696242286d934c9b38f9d2a before 3265ad619987cb551edaf797ed056d80ac450225; 9b03f38d0487f3908696242286d934c9b38f9d2a builds before 3db5647984de03d9cae0dcddb509b058351f0ee4	CNA record
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.6	CISA ADP
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name)	from V3.1.6	CISA ADP
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.6	CISA ADP
linux linux_kernel linux: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; 7.0; and 5 more ranges	NVD

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.