CVE-2026-31414

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-04-13. the CNA's CVSS baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:linux, epss, ghsa
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
33%
KEV
Not listed

Published

April 13, 2026

Last Modified

August 5, 2026

Advisory Details (8)

Auto-updated Sep 2, 2026
No patch confirmed yet.
generic

netfilter: nf_conntrack_expect: use expect->helper - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f01794106042ee27e54af6fdf5b319a2fe3df94d
generic

netfilter: nf_conntrack_expect: use expect->helper - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/3dfd3f7712b5a800f2ba632179e9b738076a51f0
generic

netfilter: nf_conntrack_expect: use expect->helper - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/b53294bff19e56ada2f230ceb8b1ffde61cc3817
generic

netfilter: nf_conntrack_expect: use expect->helper - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/4bd1b3d839172724b33d8d02c5a4ff6a1c775417
generic

netfilter: nf_conntrack_expect: use expect->helper - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/e7ccaa0a62a8ff2be5d521299ce79390c318d306
generic

netfilter: nf_conntrack_expect: use expect->helper - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/847cb7fe26c5ce5dce0d1a41fac1ea488b7f1781
generic🔴 Active Exploitation

SSA-082556

https://cert-portal.siemens.com/productcert/html/ssa-082556.html
generic

SSA-019113

https://cert-portal.siemens.com/productcert/html/ssa-019113.html

Vendor Advisories for CVE-2026-31414(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
linuxKernel @ 6.1.168—osv

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(5 across 4 ecosystems)
Debian:11(2)
PackageVulnerable rangeFixed inDependents
linux5.10.103-1 ... 7.2~rc5-1~exp1 (496 versions)——
linux-6.16.1.106-3~deb11u1 ... 6.1.164-1~deb11u1 (16 versions)6.1.170-1~deb11u1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux6.1.106-1 ... 6.1.99-1 (48 versions)6.1.170-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux6.12.38-1 ... 6.12.85-1~bpo12+1 (17 versions)6.12.85-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 6.19~rc8-1~exp1 (122 versions)6.19.12-1—

Additional Vendor Advisories

(21)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 8× in last 7d / 104× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 316 total refreshes for this CVE.

  1. 2026-09-04 05:06 UTCEPSS rescore
  2. 2026-09-02 16:38 UTCOSV refresh
  3. 2026-09-02 14:11 UTCEPSS rescore
  4. 2026-09-01 13:53 UTCEPSS rescore
  5. 2026-09-01 04:39 UTCEPSS rescore
  6. 2026-09-01 04:39 UTCEPSS rescore
  7. 2026-08-30 19:17 UTCEPSS rescore
  8. 2026-08-30 01:22 UTCEPSS rescore
  9. 2026-08-28 21:41 UTCEPSS rescore
  10. 2026-08-27 14:25 UTCEPSS rescore
  11. 2026-08-26 14:46 UTCEPSS rescore
  12. 2026-08-25 13:49 UTCEPSS rescore
  13. 2026-08-24 14:17 UTCEPSS rescore
  14. 2026-08-23 00:19 UTCEPSS rescore
  15. 2026-08-21 23:49 UTCEPSS rescore
  16. 2026-08-20 22:55 UTCEPSS rescore
  17. 2026-08-20 22:55 UTCEPSS rescore
  18. 2026-08-19 17:03 UTCEPSS rescore
  19. 2026-08-18 13:48 UTCEPSS rescore
  20. 2026-08-17 13:47 UTCEPSS rescore
  21. 2026-08-16 14:56 UTCEPSS rescore
  22. 2026-08-16 10:58 UTCVendor advisory
  23. 2026-08-16 10:58 UTCGHSA enrichment
  24. 2026-08-16 06:55 UTCEG score recompute
  25. 2026-08-16 06:55 UTCVendor advisory
Show 75 more
  1. 2026-08-16 06:55 UTCGHSA enrichment
  2. 2026-08-16 02:14 UTCEPSS rescore
  3. 2026-08-15 01:30 UTCEPSS rescore
  4. 2026-08-14 22:21 UTCVendor advisory
  5. 2026-08-14 22:21 UTCGHSA enrichment
  6. 2026-08-14 18:17 UTCVendor advisory
  7. 2026-08-14 18:17 UTCGHSA enrichment
  8. 2026-08-14 13:03 UTCVendor advisory
  9. 2026-08-14 13:03 UTCGHSA enrichment
  10. 2026-08-14 09:00 UTCVendor advisory
  11. 2026-08-14 09:00 UTCGHSA enrichment
  12. 2026-08-14 04:57 UTCEG score recompute
  13. 2026-08-14 04:57 UTCVendor advisory
  14. 2026-08-14 04:57 UTCGHSA enrichment
  15. 2026-08-13 22:00 UTCEPSS rescore
  16. 2026-08-13 09:15 UTCVendor advisory
  17. 2026-08-13 09:15 UTCGHSA enrichment
  18. 2026-08-13 03:16 UTCVendor advisory
  19. 2026-08-13 03:16 UTCGHSA enrichment
  20. 2026-08-12 23:13 UTCVendor advisory
  21. 2026-08-12 23:13 UTCGHSA enrichment
  22. 2026-08-12 19:10 UTCEG score recompute
  23. 2026-08-12 19:10 UTCVendor advisory
  24. 2026-08-12 19:10 UTCGHSA enrichment
  25. 2026-08-12 13:50 UTCEPSS rescore
  26. 2026-08-11 23:20 UTCVendor advisory
  27. 2026-08-11 23:20 UTCGHSA enrichment
  28. 2026-08-11 19:17 UTCEG score recompute
  29. 2026-08-11 19:17 UTCVendor advisory
  30. 2026-08-11 19:17 UTCGHSA enrichment
  31. 2026-08-11 06:54 UTCVendor advisory
  32. 2026-08-11 06:54 UTCGHSA enrichment
  33. 2026-08-11 02:52 UTCEG score recompute
  34. 2026-08-11 02:52 UTCVendor advisory
  35. 2026-08-11 02:52 UTCGHSA enrichment
  36. 2026-08-11 00:00 UTCEPSS rescore
  37. 2026-08-10 13:08 UTCVendor advisory
  38. 2026-08-10 13:08 UTCGHSA enrichment
  39. 2026-08-10 09:04 UTCVendor advisory
  40. 2026-08-10 09:04 UTCGHSA enrichment
  41. 2026-08-10 05:01 UTCVendor advisory
  42. 2026-08-10 05:01 UTCGHSA enrichment
  43. 2026-08-10 00:57 UTCVendor advisory
  44. 2026-08-10 00:57 UTCGHSA enrichment
  45. 2026-08-09 20:53 UTCVendor advisory
  46. 2026-08-09 20:53 UTCGHSA enrichment
  47. 2026-08-09 16:51 UTCEG score recompute
  48. 2026-08-09 16:51 UTCVendor advisory
  49. 2026-08-09 16:50 UTCGHSA enrichment
  50. 2026-08-09 13:46 UTCEPSS rescore
  51. 2026-08-09 12:47 UTCVendor advisory
  52. 2026-08-09 12:47 UTCGHSA enrichment
  53. 2026-08-09 08:23 UTCVendor advisory
  54. 2026-08-09 08:23 UTCGHSA enrichment
  55. 2026-08-09 04:20 UTCEG score recompute
  56. 2026-08-09 04:20 UTCVendor advisory
  57. 2026-08-09 04:20 UTCGHSA enrichment
  58. 2026-08-08 16:37 UTCEPSS rescore
  59. 2026-08-08 10:15 UTCVendor advisory
  60. 2026-08-08 10:15 UTCGHSA enrichment
  61. 2026-08-08 06:12 UTCVendor advisory
  62. 2026-08-08 06:12 UTCGHSA enrichment
  63. 2026-08-08 02:09 UTCVendor advisory
  64. 2026-08-08 02:09 UTCGHSA enrichment
  65. 2026-08-07 22:06 UTCVendor advisory
  66. 2026-08-07 22:06 UTCGHSA enrichment
  67. 2026-08-07 18:03 UTCEG score recompute
  68. 2026-08-07 18:03 UTCVendor advisory
  69. 2026-08-07 18:03 UTCGHSA enrichment
  70. 2026-08-07 14:00 UTCVendor advisory
  71. 2026-08-07 14:00 UTCGHSA enrichment
  72. 2026-08-06 17:30 UTCEG score recompute
  73. 2026-08-06 17:30 UTCVendor advisory
  74. 2026-08-06 17:30 UTCGHSA enrichment
  75. 2026-08-06 13:46 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-31414?
CVE-2026-31414 is a critical vulnerability published on April 13, 2026. In the Linux kernel, the following vulnerability has been resolved: netfilter: nfconntrackexpect: 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…
When was CVE-2026-31414 disclosed?
CVE-2026-31414 was first published in the National Vulnerability Database on April 13, 2026, with the most recent update on August 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-31414 actively exploited?
CVE-2026-31414 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 66.9% of all scored CVEs.
What is the CVSS score of CVE-2026-31414?
CVE-2026-31414 has a CVSS v4.0 base score of 9.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-31414?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-31414, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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