netfilter: nf_conntrack_expect: use expect->helper

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Summary

CVECVE-2026-31414
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-13 14:16:10 UTC
Updated2026-05-20 15:43:42 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.000320000 probability, percentile 0.092090000 (date 2026-04-27)

Problem Types: NVD-CWE-noinfo

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected ea781f197d6a835cbb93a0bf88ee1696296ed8aa 847cb7fe26c5ce5dce0d1a41fac1ea488b7f1781 git Not specified
CNA Linux Linux affected ea781f197d6a835cbb93a0bf88ee1696296ed8aa e7ccaa0a62a8ff2be5d521299ce79390c318d306 git Not specified
CNA Linux Linux affected ea781f197d6a835cbb93a0bf88ee1696296ed8aa 4bd1b3d839172724b33d8d02c5a4ff6a1c775417 git Not specified
CNA Linux Linux affected ea781f197d6a835cbb93a0bf88ee1696296ed8aa b53294bff19e56ada2f230ceb8b1ffde61cc3817 git Not specified
CNA Linux Linux affected ea781f197d6a835cbb93a0bf88ee1696296ed8aa 3dfd3f7712b5a800f2ba632179e9b738076a51f0 git Not specified
CNA Linux Linux affected ea781f197d6a835cbb93a0bf88ee1696296ed8aa f01794106042ee27e54af6fdf5b319a2fe3df94d git Not specified
CNA Linux Linux affected 2.6.30 Not specified
CNA Linux Linux unaffected 2.6.30 semver Not specified
CNA Linux Linux unaffected 6.1.168 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.134 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.81 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.22 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.12 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/f01794106042ee27e54af6fdf5b319a2fe3df94d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/3dfd3f7712b5a800f2ba632179e9b738076a51f0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/847cb7fe26c5ce5dce0d1a41fac1ea488b7f1781 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/4bd1b3d839172724b33d8d02c5a4ff6a1c775417 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/b53294bff19e56ada2f230ceb8b1ffde61cc3817 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/e7ccaa0a62a8ff2be5d521299ce79390c318d306 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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