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Vulnerability record · CVE-2026-31414 · published 13 April 2026

CVE-2026-31414: Linux kernel vulnerability

Linux · Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_expect: use expect->helper Use expect->helper in ctnetlink and /proc to dump the helper name. Using nfct_help() without holding a reference to the master conntrack is unsafe. Use exp->master->helper in ctnetlink path if userspace does not provide an explicit helper when creating an expectation to retain the existing behaviour. The ctnetlink expectation path holds the reference on the master conntrack and nf_conntrack_expect lock and the nfnetlink glue path refers to the master ct that is attached to the skb.

9.8 CVSS 3.1 Critical EPSS 0.76% · top 46.7%
9.8CVSS 3.1 base score
0.76%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
14 Jul 2026Last modified by NVD

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_expect: use expect->helper Use expect->helper in ctnetlink and /proc to dump the helper name. Using nfct_help() without holding a reference to the master conntrack is unsafe. Use exp->master->helper in ctnetlink path if userspace does not provide an explicit helper when creating an expectation to retain the existing behaviour. The ctnetlink expectation path holds the reference on the master conntrack and nf_conntrack_expect lock and the nfnetlink glue path refers to the master ct that is attached to the skb.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/3dfd3f7712b5a800f2ba632179e9b738076a51f0 Patch
https://git.kernel.org/stable/c/4bd1b3d839172724b33d8d02c5a4ff6a1c775417 Patch
https://git.kernel.org/stable/c/847cb7fe26c5ce5dce0d1a41fac1ea488b7f1781 Patch
https://git.kernel.org/stable/c/b53294bff19e56ada2f230ceb8b1ffde61cc3817 Patch
https://git.kernel.org/stable/c/e7ccaa0a62a8ff2be5d521299ce79390c318d306 Patch
https://git.kernel.org/stable/c/f01794106042ee27e54af6fdf5b319a2fe3df94d Patch
https://cert-portal.siemens.com/productcert/html/ssa-019113.html
https://cert-portal.siemens.com/productcert/html/ssa-082556.html

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Source: NIST National Vulnerability Database (record CVE-2026-31414), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.