CVE-2026-23339

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2026-03-25. NVD baseline CVSS 5.5; sources differ by 0.0.

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

nfc: nci: free skb on nci_transceive early error paths

nci_transceive() takes ownership of the skb passed by the caller, but the -EPROTO, -EINVAL, and -EBUSY error paths return without freeing it.

Due to issues clearing NCI_DATA_EXCHANGE fixed by subsequent changes the nci/nci_dev selftest hits the error path occasionally in NIPA, and kmemleak detects leaks:

unreferenced object 0xff11000015ce6a40 (size 640): comm "nci_dev", pid 3954, jiffies 4295441246 hex dump (first 32 bytes): 6b 6b 6b 6b 00 a4 00 0c 02 e1 03 6b 6b 6b 6b 6b kkkk.......kkkkk 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk backtrace (crc 7c40cc2a): kmem_cache_alloc_node_noprof+0x492/0x630 __alloc_skb+0x11e/0x5f0 alloc_skb_with_frags+0xc6/0x8f0 sock_alloc_send_pskb+0x326/0x3f0 nfc_alloc_send_skb+0x94/0x1d0 rawsock_sendmsg+0x162/0x4c0 do_syscall_64+0x117/0xfc0

CVSS v3
5.5
EG Score
5.5(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: 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
Severity55% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
2%
KEV
Not listed

Published

March 25, 2026

Last Modified

April 23, 2026

References (8)

Vendor Advisories for CVE-2026-23339(1)

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.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 52× 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 132 total refreshes for this CVE.

  1. 2026-07-26 14:54 UTCEPSS rescore
  2. 2026-07-26 14:54 UTCEPSS rescore
  3. 2026-07-25 14:17 UTCEPSS rescore
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  6. 2026-07-23 14:18 UTCEPSS rescore
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  8. 2026-07-23 03:07 UTCEG score recompute
  9. 2026-07-22 14:08 UTCEPSS rescore
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  17. 2026-07-18 10:04 UTCEPSS rescore
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  19. 2026-07-17 07:16 UTCOSV refresh
  20. 2026-07-16 17:03 UTCEPSS rescore
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  22. 2026-07-15 16:57 UTCEPSS rescore
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  24. 2026-07-15 02:00 UTCEPSS rescore
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  1. 2026-07-13 22:30 UTCEPSS rescore
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  4. 2026-07-12 05:46 UTCEPSS rescore
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  6. 2026-07-11 08:27 UTCEPSS rescore
  7. 2026-07-09 19:10 UTCEPSS rescore
  8. 2026-07-08 15:15 UTCEPSS rescore
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  10. 2026-07-07 13:46 UTCEPSS rescore
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  20. 2026-06-30 23:22 UTCEPSS rescore
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  22. 2026-06-29 14:06 UTCEPSS rescore
  23. 2026-06-29 05:02 UTCOSV refresh
  24. 2026-06-28 14:07 UTCEPSS rescore
  25. 2026-06-28 14:07 UTCEPSS rescore
  26. 2026-06-28 04:56 UTCEPSS rescore
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  29. 2026-06-25 13:49 UTCEPSS rescore
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  31. 2026-06-24 14:05 UTCEPSS rescore
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  41. 2026-06-19 19:25 UTCEPSS rescore
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  49. 2026-06-13 23:00 UTCEPSS rescore
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  51. 2026-06-12 23:12 UTCEPSS rescore
  52. 2026-06-11 23:32 UTCGHSA enrichment
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  55. 2026-06-10 15:48 UTCGHSA enrichment
  56. 2026-06-10 13:22 UTCEPSS rescore
  57. 2026-06-09 15:56 UTCGHSA enrichment
  58. 2026-06-08 14:32 UTCGHSA enrichment
  59. 2026-06-08 14:17 UTCEPSS rescore
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  61. 2026-06-07 15:25 UTCEPSS rescore
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  63. 2026-06-07 12:33 UTCGHSA enrichment
  64. 2026-06-06 13:47 UTCEPSS rescore
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  73. 2026-06-02 20:13 UTCEPSS rescore
  74. 2026-06-02 20:13 UTCEPSS rescore
  75. 2026-06-01 13:51 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2026-23339?
CVE-2026-23339 is a medium vulnerability published on March 25, 2026. In the Linux kernel, the following vulnerability has been resolved: nfc: nci: free skb on nci_transceive early error paths nci_transceive() takes ownership of the skb passed by the caller, but the -EPROTO, -EINVAL, and -EBUSY error paths return without freeing it. Due to issues clearing…
When was CVE-2026-23339 disclosed?
CVE-2026-23339 was first published in the National Vulnerability Database on March 25, 2026, with the most recent update on April 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-23339 actively exploited?
CVE-2026-23339 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 97.6% of all scored CVEs.
What is the CVSS score of CVE-2026-23339?
CVE-2026-23339 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-23339?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-23339, 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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