CVE-2026-23391

HIGHPre-NVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

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

Triggered by: GitHub Security Advisory CVSS
Sources: cna:linux, epss, ghsa
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: 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: 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)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity78% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
3%
KEV
Not listed

Published

March 25, 2026

Last Modified

August 5, 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(2)

Vendor / EcosystemFixed in / PatchReleasedSource
linuxKernel @ 5.10.253—osv
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.

Affected Packages

(5 across 4 ecosystems)
Debian:11(2)
PackageVulnerable rangeFixed inDependents
linux5.10.103-1 ... 5.10.92-2 (53 versions)5.10.257-1—
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 (119 versions)6.19.10-1—

Additional Vendor Advisories

(24)

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 6× in last 7d / 58× 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 213 total refreshes for this CVE.

  1. 2026-09-02 15:01 UTCOSV refresh
  2. 2026-09-02 14:11 UTCEPSS rescore
  3. 2026-09-01 13:53 UTCEPSS rescore
  4. 2026-09-01 04:39 UTCEPSS rescore
  5. 2026-08-30 19:17 UTCEPSS rescore
  6. 2026-08-30 01:22 UTCEPSS rescore
  7. 2026-08-28 21:41 UTCEPSS rescore
  8. 2026-08-27 14:25 UTCEPSS rescore
  9. 2026-08-25 13:48 UTCEPSS rescore
  10. 2026-08-23 00:19 UTCEPSS rescore
  11. 2026-08-21 23:49 UTCEPSS rescore
  12. 2026-08-20 22:55 UTCEPSS rescore
  13. 2026-08-19 17:03 UTCEPSS rescore
  14. 2026-08-18 13:48 UTCEPSS rescore
  15. 2026-08-17 13:47 UTCEPSS rescore
  16. 2026-08-16 14:56 UTCEPSS rescore
  17. 2026-08-16 10:23 UTCEG score recompute
  18. 2026-08-16 10:23 UTCVendor advisory
  19. 2026-08-16 10:23 UTCGHSA enrichment
  20. 2026-08-16 02:14 UTCEPSS rescore
  21. 2026-08-15 01:30 UTCEPSS rescore
  22. 2026-08-14 19:34 UTCVendor advisory
  23. 2026-08-14 19:34 UTCGHSA enrichment
  24. 2026-08-14 06:42 UTCEG score recompute
  25. 2026-08-14 06:42 UTCVendor advisory
Show 75 more
  1. 2026-08-14 06:42 UTCGHSA enrichment
  2. 2026-08-13 22:00 UTCEPSS rescore
  3. 2026-08-12 20:58 UTCEG score recompute
  4. 2026-08-12 20:58 UTCVendor advisory
  5. 2026-08-12 20:58 UTCGHSA enrichment
  6. 2026-08-12 13:50 UTCEPSS rescore
  7. 2026-08-11 21:00 UTCEG score recompute
  8. 2026-08-11 21:00 UTCVendor advisory
  9. 2026-08-11 21:00 UTCGHSA enrichment
  10. 2026-08-11 13:42 UTCEPSS rescore
  11. 2026-08-11 04:04 UTCEG score recompute
  12. 2026-08-11 04:04 UTCVendor advisory
  13. 2026-08-11 04:04 UTCGHSA enrichment
  14. 2026-08-11 00:00 UTCEPSS rescore
  15. 2026-08-10 05:10 UTCVendor advisory
  16. 2026-08-10 05:10 UTCGHSA enrichment
  17. 2026-08-09 17:43 UTCEG score recompute
  18. 2026-08-09 17:43 UTCVendor advisory
  19. 2026-08-09 17:43 UTCGHSA enrichment
  20. 2026-08-09 13:46 UTCEPSS rescore
  21. 2026-08-09 06:15 UTCEG score recompute
  22. 2026-08-09 06:15 UTCVendor advisory
  23. 2026-08-09 06:15 UTCGHSA enrichment
  24. 2026-08-08 16:37 UTCEPSS rescore
  25. 2026-08-08 04:01 UTCVendor advisory
  26. 2026-08-08 04:01 UTCGHSA enrichment
  27. 2026-08-07 16:34 UTCEG score recompute
  28. 2026-08-07 16:34 UTCVendor advisory
  29. 2026-08-07 16:34 UTCGHSA enrichment
  30. 2026-08-06 19:01 UTCEG score recompute
  31. 2026-08-06 19:01 UTCVendor advisory
  32. 2026-08-06 19:01 UTCGHSA enrichment
  33. 2026-08-06 13:46 UTCEPSS rescore
  34. 2026-08-06 01:04 UTCEG score recompute
  35. 2026-08-06 01:04 UTCVendor advisory
  36. 2026-08-06 01:04 UTCGHSA enrichment
  37. 2026-08-05 19:17 UTCEPSS rescore
  38. 2026-08-05 12:43 UTCEG score recompute
  39. 2026-08-05 12:43 UTCVendor advisory
  40. 2026-08-05 12:43 UTCGHSA enrichment
  41. 2026-08-04 15:10 UTCEPSS rescore
  42. 2026-08-04 10:38 UTCEPSS rescore
  43. 2026-08-03 23:50 UTCEG score recompute
  44. 2026-08-03 23:50 UTCVendor advisory
  45. 2026-08-03 23:50 UTCGHSA enrichment
  46. 2026-08-03 10:35 UTCEPSS rescore
  47. 2026-08-02 15:37 UTCEG score recompute
  48. 2026-08-02 15:37 UTCVendor advisory
  49. 2026-08-02 15:37 UTCGHSA enrichment
  50. 2026-08-02 02:26 UTCEPSS rescore
  51. 2026-08-01 04:15 UTCEPSS rescore
  52. 2026-07-30 01:30 UTCEPSS rescore
  53. 2026-07-27 14:13 UTCEPSS rescore
  54. 2026-07-26 14:54 UTCEPSS rescore
  55. 2026-07-26 14:54 UTCEPSS rescore
  56. 2026-07-25 14:17 UTCEPSS rescore
  57. 2026-07-25 14:17 UTCEPSS rescore
  58. 2026-07-24 14:17 UTCEPSS rescore
  59. 2026-07-23 14:18 UTCEPSS rescore
  60. 2026-07-23 14:18 UTCEPSS rescore
  61. 2026-07-23 03:07 UTCEG score recompute
  62. 2026-07-22 14:08 UTCEPSS rescore
  63. 2026-07-21 15:24 UTCEPSS rescore
  64. 2026-07-21 15:24 UTCEPSS rescore
  65. 2026-07-20 17:08 UTCEPSS rescore
  66. 2026-07-19 14:31 UTCEPSS rescore
  67. 2026-07-19 14:31 UTCEPSS rescore
  68. 2026-07-19 02:29 UTCEPSS rescore
  69. 2026-07-19 02:28 UTCEPSS rescore
  70. 2026-07-18 10:04 UTCEPSS rescore
  71. 2026-07-18 10:04 UTCEPSS rescore
  72. 2026-07-17 07:16 UTCOSV refresh
  73. 2026-07-16 17:03 UTCEPSS rescore
  74. 2026-07-16 17:03 UTCEPSS rescore
  75. 2026-07-15 16:57 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 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-2026-23391 actively exploited?
CVE-2026-23391 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 97.2% of all scored CVEs.
What is the CVSS score of CVE-2026-23391?
CVE-2026-23391 has a CVSS v4.0 base score of 7.8 (CNA self-assessment; NVD's own analysis pending).
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.

Dependency Blast Radius

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