CVE-2026-31414
Full vulnerability record from the local CVENow database.
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.
Severity
CRITICAL
CVSS score
9.8
(v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-04-13 14:16:10.537000
Last modified
2026-10-19 19:17:52.430000
View original CVE JSON
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"published": "2026-04-13T14:16:10.537",
"lastModified": "2026-10-19T19:17:52.430",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_conntrack_expect: use expect->helper\n\nUse expect->helper in ctnetlink and /proc to dump the helper name.\nUsing nfct_help() without holding a reference to the master conntrack\nis unsafe.\n\nUse exp->master->helper in ctnetlink path if userspace does not provide\nan explicit helper when creating an expectation to retain the existing\nbehaviour. The ctnetlink expectation path holds the reference on the\nmaster conntrack and nf_conntrack_expect lock and the nfnetlink glue\npath refers to the master ct that is attached to the skb."
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