CVE-2026-31414 (GCVE-0-2026-31414)
Vulnerability from cvelistv5 – Published: 2026-04-13 13:21 – Updated: 2026-04-13 13:21
VLAI?
Title
netfilter: nf_conntrack_expect: use expect->helper
Summary
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 ?
No CVSS data available.
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Affected:
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 847cb7fe26c5ce5dce0d1a41fac1ea488b7f1781
(git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < e7ccaa0a62a8ff2be5d521299ce79390c318d306 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 4bd1b3d839172724b33d8d02c5a4ff6a1c775417 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < b53294bff19e56ada2f230ceb8b1ffde61cc3817 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 3dfd3f7712b5a800f2ba632179e9b738076a51f0 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < f01794106042ee27e54af6fdf5b319a2fe3df94d (git) |
||
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"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"
],
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"vendor": "Linux",
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{
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}
]
},
{
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"product": "Linux",
"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"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.168",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.134",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.81",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.22",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.19.*",
"status": "unaffected",
"version": "6.19.12",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
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{
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{
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},
{
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{
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"versionEndExcluding": "7.0",
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}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_conntrack_expect: use expect-\u003ehelper\n\nUse expect-\u003ehelper 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-\u003emaster-\u003ehelper 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."
}
],
"providerMetadata": {
"dateUpdated": "2026-04-13T13:21:02.592Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/847cb7fe26c5ce5dce0d1a41fac1ea488b7f1781"
},
{
"url": "https://git.kernel.org/stable/c/e7ccaa0a62a8ff2be5d521299ce79390c318d306"
},
{
"url": "https://git.kernel.org/stable/c/4bd1b3d839172724b33d8d02c5a4ff6a1c775417"
},
{
"url": "https://git.kernel.org/stable/c/b53294bff19e56ada2f230ceb8b1ffde61cc3817"
},
{
"url": "https://git.kernel.org/stable/c/3dfd3f7712b5a800f2ba632179e9b738076a51f0"
},
{
"url": "https://git.kernel.org/stable/c/f01794106042ee27e54af6fdf5b319a2fe3df94d"
}
],
"title": "netfilter: nf_conntrack_expect: use expect-\u003ehelper",
"x_generator": {
"engine": "bippy-1.2.0"
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}
},
"cveMetadata": {
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"assignerShortName": "Linux",
"cveId": "CVE-2026-31414",
"datePublished": "2026-04-13T13:21:02.592Z",
"dateReserved": "2026-03-09T15:48:24.087Z",
"dateUpdated": "2026-04-13T13:21:02.592Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-31414",
"date": "2026-04-16",
"epss": "0.00024",
"percentile": "0.06618"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2026-31414\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-04-13T14:16:10.537\",\"lastModified\":\"2026-04-13T15:01:43.663\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnetfilter: nf_conntrack_expect: use expect-\u003ehelper\\n\\nUse expect-\u003ehelper 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-\u003emaster-\u003ehelper 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.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/3dfd3f7712b5a800f2ba632179e9b738076a51f0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4bd1b3d839172724b33d8d02c5a4ff6a1c775417\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/847cb7fe26c5ce5dce0d1a41fac1ea488b7f1781\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b53294bff19e56ada2f230ceb8b1ffde61cc3817\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e7ccaa0a62a8ff2be5d521299ce79390c318d306\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f01794106042ee27e54af6fdf5b319a2fe3df94d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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