netfilter: nf_conntrack_expect: use expect->helper
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.
CVE-2026-31414
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-31414
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "ea781f197d6a835cbb93a0bf88ee1696296ed8aa",
"lessThan": "847cb7fe26c5ce5dce0d1a41fac1ea488b7f1781",
"versionType": "git"
},
{
"status": "affected",
"version": "ea781f197d6a835cbb93a0bf88ee1696296ed8aa",
"lessThan": "e7ccaa0a62a8ff2be5d521299ce79390c318d306",
"versionType": "git"
},
{
"status": "affected",
"version": "ea781f197d6a835cbb93a0bf88ee1696296ed8aa",
"lessThan": "4bd1b3d839172724b33d8d02c5a4ff6a1c775417",
"versionType": "git"
},
{
"status": "affected",
"version": "ea781f197d6a835cbb93a0bf88ee1696296ed8aa",
"lessThan": "b53294bff19e56ada2f230ceb8b1ffde61cc3817",
"versionType": "git"
},
{
"status": "affected",
"version": "ea781f197d6a835cbb93a0bf88ee1696296ed8aa",
"lessThan": "3dfd3f7712b5a800f2ba632179e9b738076a51f0",
"versionType": "git"
},
{
"status": "affected",
"version": "ea781f197d6a835cbb93a0bf88ee1696296ed8aa",
"lessThan": "f01794106042ee27e54af6fdf5b319a2fe3df94d",
"versionType": "git"
}
],
"programFiles": [
"net/netfilter/nf_conntrack_expect.c",
"net/netfilter/nf_conntrack_helper.c",
"net/netfilter/nf_conntrack_netlink.c",
"net/netfilter/nf_conntrack_sip.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.30"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.30",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.1.168",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.134",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.81",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.22",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19.12",
"versionType": "semver",
"lessThanOrEqual": "6.19.*"
},
{
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/netfilter/nf_conntrack_expect.c",
"net/netfilter/nf_conntrack_helper.c",
"net/netfilter/nf_conntrack_netlink.c",
"net/netfilter/nf_conntrack_sip.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-31414
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #39871 · Revision 1
- Added to Heist Feed
- Publisher date