CVE-2026-23386

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
5.5
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:

gve: fix incorrect buffer cleanup in gve_tx_clean_pending_packets for QPL

In DQ-QPL mode, gve_tx_clean_pending_packets() incorrectly uses the RDA buffer cleanup path. It iterates num_bufs times and attempts to unmap entries in the dma array.

This leads to two issues:

  • The dma array shares storage with tx_qpl_buf_ids (union).
Interpreting buffer IDs as DMA addresses results in attempting to unmap incorrect memory locations.
  • num_bufs in QPL mode (counting 2K chunks) can significantly exceed
the size of the dma array, causing out-of-bounds access warnings (trace below is how we noticed this issue).

UBSAN: array-index-out-of-bounds in drivers/net/ethernet/drivers/net/ethernet/google/gve/gve_tx_dqo.c:178:5 index 18 is out of range for type 'dma_addr_t[18]' (aka 'unsigned long long[18]') Workqueue: gve gve_service_task [gve] Call Trace:

dump_stack_lvl+0x33/0xa0 __ubsan_handle_out_of_bounds+0xdc/0x110 gve_tx_stop_ring_dqo+0x182/0x200 [gve] gve_close+0x1be/0x450 [gve] gve_reset+0x99/0x120 [gve] gve_service_task+0x61/0x100 [gve] process_scheduled_works+0x1e9/0x380

Fix this by properly checking for QPL mode and delegating to gve_free_tx_qpl_bufs() to reclaim the buffers.

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

Published

March 25, 2026

Last Modified

April 24, 2026

References (5)

Vendor Advisories for CVE-2026-23386(1)

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 @ 6.6.130—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 5× 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 106 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
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  18. 2026-06-29 05:02 UTCOSV refresh
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  1. 2026-06-24 14:05 UTCEPSS rescore
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  21. 2026-06-11 23:31 UTCEG score recompute
  22. 2026-06-11 23:31 UTCGHSA enrichment
  23. 2026-06-11 14:00 UTCEPSS rescore
  24. 2026-06-10 22:18 UTCEPSS rescore
  25. 2026-06-10 16:51 UTCEG score recompute
  26. 2026-06-10 16:51 UTCGHSA enrichment
  27. 2026-06-10 13:22 UTCEPSS rescore
  28. 2026-06-09 15:54 UTCEG score recompute
  29. 2026-06-09 15:54 UTCGHSA enrichment
  30. 2026-06-08 14:17 UTCEPSS rescore
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  32. 2026-06-08 14:12 UTCEG score recompute
  33. 2026-06-08 14:12 UTCGHSA enrichment
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  36. 2026-06-07 12:28 UTCEG score recompute
  37. 2026-06-07 12:28 UTCGHSA enrichment
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  52. 2026-06-01 07:13 UTCOSV refresh
  53. 2026-05-31 22:30 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2026-23386?
CVE-2026-23386 is a medium vulnerability published on March 25, 2026. In the Linux kernel, the following vulnerability has been resolved: gve: fix incorrect buffer cleanup in gvetxcleanpendingpackets for QPL In DQ-QPL mode, gvetxcleanpendingpackets() incorrectly uses the RDA buffer cleanup path. It iterates num_bufs times and attempts to unmap entries in the dma…
When was CVE-2026-23386 disclosed?
CVE-2026-23386 was first published in the National Vulnerability Database on March 25, 2026, with the most recent update on April 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-23386 actively exploited?
CVE-2026-23386 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-2026-23386?
CVE-2026-23386 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-23386?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-23386, 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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