CVE-2026-23391

HIGHPre-NVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-03-25. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.8Exploit: NoneExposed: 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: xt_CT: drop pending enqueued packets on template removal

Templates refer to objects that can go away while packets are sitting in nfqueue refer to:

  • helper, this can be an issue on module removal.
  • timeout policy, nfnetlink_cttimeout might remove it.

The use of templates with zone and event cache filter are safe, since this just copies values.

Flush these enqueued packets in case the template rule gets removed.

CVSS v3
7.8
EG Score
7.8(medium)
EPSS
2.9%
KEV
Not listed

Published

March 25, 2026

Last Modified

July 14, 2026

Advisory Details (8)

Auto-updated Jun 10, 2026
No patch confirmed yet.
generic

netfilter: xt_CT: drop pending enqueued packets on template removal - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f62a218a946b19bb59abdd5361da85fa4606b96b
generic

netfilter: xt_CT: drop pending enqueued packets on template removal - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/d2d0bae0c9a2a17b6990a2966f5cdce0813d6256
generic

netfilter: xt_CT: drop pending enqueued packets on template removal - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/cc57506dd66555899560b9c0f24e813f034e12ec
generic

netfilter: xt_CT: drop pending enqueued packets on template removal - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/cb549925875fa06dd155e49db4ac2c5044c30f9c
generic

netfilter: xt_CT: drop pending enqueued packets on template removal - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/777d02efe3d630cca4c1b63962cec17c57711325
generic

netfilter: xt_CT: drop pending enqueued packets on template removal - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/63b8097cea1923fe82cd598068d0796da8c015ec
generic

netfilter: xt_CT: drop pending enqueued packets on template removal - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/55445134d42b84cb0a272e42c98d233ca65eca83
generic

netfilter: xt_CT: drop pending enqueued packets on template removal - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/19a230dec6bb8928e3f96387f9085cf2c79bcef9

Vendor Advisories for CVE-2026-23391(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 @ 6.1.167—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.

Data Freshness Timeline

(refreshed 7× in last 7d / 43× 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 121 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-23391?
CVE-2026-23391 is a high vulnerability published on March 25, 2026. In the Linux kernel, the following vulnerability has been resolved: netfilter: xt_CT: drop pending enqueued packets on template removal Templates refer to objects that can go away while packets are sitting in nfqueue refer to: helper, this can be an issue on module removal. timeout policy,…
When was CVE-2026-23391 disclosed?
CVE-2026-23391 was first published in the National Vulnerability Database on March 25, 2026, with the most recent update on July 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-23391 actively exploited?
CVE-2026-23391 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-23391?
CVE-2026-23391 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-23391?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-23391, 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.

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