CVE-2026-23399

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2026-03-28. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.5Exploit: 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:

nf_tables: nft_dynset: fix possible stateful expression memleak in error path

If cloning the second stateful expression in the element via GFP_ATOMIC fails, then the first stateful expression remains in place without being released.

  unreferenced object (percpu) 0x607b97e9cab8 (size 16):     comm "softirq", pid 0, jiffies 4294931867     hex dump (first 16 bytes on cpu 3):       00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00     backtrace (crc 0):       pcpu_alloc_noprof+0x453/0xd80       nft_counter_clone+0x9c/0x190 [nf_tables]       nft_expr_clone+0x8f/0x1b0 [nf_tables]       nft_dynset_new+0x2cb/0x5f0 [nf_tables]       nft_rhash_update+0x236/0x11c0 [nf_tables]       nft_dynset_eval+0x11f/0x670 [nf_tables]       nft_do_chain+0x253/0x1700 [nf_tables]       nft_do_chain_ipv4+0x18d/0x270 [nf_tables]       nf_hook_slow+0xaa/0x1e0       ip_local_deliver+0x209/0x330

CVSS v3
5.5
EG Score
5.5(medium)
EPSS
2.3%
KEV
Not listed

Published

March 28, 2026

Last Modified

June 1, 2026

References (7)

Vendor Advisories for CVE-2026-23399(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 @ 6.12.78—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.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 10× in last 7d / 41× 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 107 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-23399?
CVE-2026-23399 is a medium vulnerability published on March 28, 2026. In the Linux kernel, the following vulnerability has been resolved: nftables: nftdynset: fix possible stateful expression memleak in error path If cloning the second stateful expression in the element via GFP_ATOMIC fails, then the first stateful expression remains in place without being released.…
When was CVE-2026-23399 disclosed?
CVE-2026-23399 was first published in the National Vulnerability Database on March 28, 2026, with the most recent update on June 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-23399 actively exploited?
CVE-2026-23399 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-23399?
CVE-2026-23399 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-23399?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-23399, 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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