netfilter: nf_conntrack_expect: use expect->helper (Linux Linux)

CVE-2026-31414
CRITICAL 9.8

At a glance

Source
NVD
EPSS
EPSS 0.56 % · percentile 47 ()
State
PUBLISHED
Published
Updated
Assigner
Linux
NVD status
Modified

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.

Weaknesses (CWE)

  • CWE-476 — NULL Pointer Dereference

References

Scores

VersionScoreVectorScored by
CVSS 3.1CRITICAL 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HLinux
CVSS 3.1CRITICAL 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HNVD · 416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Secondary)

European references

CERT-FR advisories

Affected configurations (NVD CPE)

Affected products

ProductVersions
Linux · Linuxaffected ea781f197d6a835cbb93a0bf88ee1696296ed8aa < 847cb7fe26c5ce5dce0d1a41fac1ea488b7f1781 ; affected ea781f197d6a835cbb93a0bf88ee1696296ed8aa < e7ccaa0a62a8ff2be5d521299ce79390c318d306 ; affected ea781f197d6a835cbb93a0bf88ee1696296ed8aa < 4bd1b3d839172724b33d8d02c5a4ff6a1c775417 ; affected ea781f197d6a835cbb93a0bf88ee1696296ed8aa < b53294bff19e56ada2f230ceb8b1ffde61cc3817 ; affected ea781f197d6a835cbb93a0bf88ee1696296ed8aa < 3dfd3f7712b5a800f2ba632179e9b738076a51f0 ; affected ea781f197d6a835cbb93a0bf88ee1696296ed8aa < f01794106042ee27e54af6fdf5b319a2fe3df94d
Linux · Linuxaffected 2.6.30 ; unaffected 0 < 2.6.30 ; unaffected 6.1.168 ≤ 6.1.* ; unaffected 6.6.134 ≤ 6.6.* ; unaffected 6.12.81 ≤ 6.12.* ; unaffected 6.18.22 ≤ 6.18.*

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD