CVE-2026-63899

UNRATEDCVSS · not yet scoredTrending — 3 sources updated this week
—
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • No CVSS published and no exploitation signals yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS v2: —Exploit: None knownExposed: 0

A fix is available — apply it.

In the Linux kernel, the following vulnerability has been resolved:

USB: serial: mxuport: fix memory corruption with small endpoint

Make sure that the bulk-out endpoint max packet size is at least eight bytes to avoid user-controlled slab corruption should a malicious device report a smaller size.

CVSS v3
—
EchelonGraph score
Not yet assessedNo source has published severity data for this CVE yet — no CVSS score from NVD or a CNA, no GitHub advisory, and it is not in CISA KEV. This is not a rating of zero; we cannot assess it yet.
EG Score
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EG Risk
—
EPSS PROB
0%
EPSS %ILE
13%
KEV
Not listed

Published

July 19, 2026

Last Modified

July 27, 2026

References (8)

Vendor Advisories for CVE-2026-63899(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(5)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-tools-raspi-realtime-7.0 (7.0.0-1015.15) @ resolute2026-08-28ubuntu
ubuntulinux-tools-nvidia-hwe-24.04-edge (7.0.0-1016.16) @ resolute2026-08-28ubuntu
ubuntulinux-tools-oracle-7.0 (7.0.0-1008.8) @ resolute2026-08-28ubuntu
ubuntulinux-tools-azure-fde-7.0 (7.0.0-1009.9) @ resolute2026-08-28ubuntu
ubuntulinux-tools-nvidia-hwe-26.04 (7.0.0-2016.16) @ resolute2026-08-28ubuntu

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

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
linux5.10.103-1 ... 5.10.92-2 (54 versions)5.10.259-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux6.1.106-1 ... 6.1.99-1 (53 versions)6.1.176-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux6.12.38-1 ... 6.12.94-1~bpo12+1 (27 versions)6.12.94-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 7.0.9-1~bpo13+1 (138 versions)7.0.12-1—

All Vendor Advisories

(5)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 9× 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.

  1. 2026-08-30 01:22 UTCEPSS rescore
  2. 2026-08-28 21:42 UTCEPSS rescore
  3. 2026-08-28 03:30 UTCVendor advisory
  4. 2026-08-28 03:30 UTCGHSA enrichment
  5. 2026-08-27 14:25 UTCEPSS rescore
  6. 2026-08-26 14:46 UTCEPSS rescore
  7. 2026-08-25 13:49 UTCEPSS rescore
  8. 2026-08-25 00:50 UTCVendor advisory
  9. 2026-08-25 00:49 UTCGHSA enrichment
  10. 2026-08-23 00:19 UTCEPSS rescore
  11. 2026-08-21 23:49 UTCEPSS rescore
  12. 2026-08-21 22:20 UTCVendor advisory
  13. 2026-08-21 22:20 UTCGHSA enrichment
  14. 2026-08-20 22:55 UTCEPSS rescore
  15. 2026-08-19 17:04 UTCEPSS rescore
  16. 2026-08-18 19:50 UTCVendor advisory
  17. 2026-08-18 19:50 UTCGHSA enrichment
  18. 2026-08-18 13:48 UTCEPSS rescore
  19. 2026-08-17 13:47 UTCEPSS rescore
  20. 2026-08-16 14:56 UTCEPSS rescore
  21. 2026-08-15 09:52 UTCVendor advisory
  22. 2026-08-15 09:52 UTCGHSA enrichment
  23. 2026-08-15 01:30 UTCEPSS rescore
  24. 2026-08-13 22:00 UTCEPSS rescore
  25. 2026-08-12 13:51 UTCEPSS rescore
Show 46 more
  1. 2026-08-12 07:23 UTCVendor advisory
  2. 2026-08-12 07:23 UTCGHSA enrichment
  3. 2026-08-11 00:00 UTCEPSS rescore
  4. 2026-08-09 13:47 UTCEPSS rescore
  5. 2026-08-09 04:53 UTCVendor advisory
  6. 2026-08-09 04:53 UTCGHSA enrichment
  7. 2026-08-06 13:47 UTCEPSS rescore
  8. 2026-08-06 02:24 UTCVendor advisory
  9. 2026-08-06 02:24 UTCGHSA enrichment
  10. 2026-08-05 19:17 UTCEPSS rescore
  11. 2026-08-05 19:17 UTCEPSS rescore
  12. 2026-08-04 15:10 UTCEPSS rescore
  13. 2026-08-04 10:39 UTCEPSS rescore
  14. 2026-08-03 10:36 UTCEPSS rescore
  15. 2026-08-02 23:56 UTCVendor advisory
  16. 2026-08-02 23:56 UTCGHSA enrichment
  17. 2026-08-02 02:27 UTCEPSS rescore
  18. 2026-08-01 04:16 UTCEPSS rescore
  19. 2026-07-30 21:26 UTCEG score recompute
  20. 2026-07-30 21:26 UTCVendor advisory
  21. 2026-07-30 21:26 UTCGHSA enrichment
  22. 2026-07-30 01:30 UTCEPSS rescore
  23. 2026-07-30 01:30 UTCEPSS rescore
  24. 2026-07-28 15:37 UTCEPSS rescore
  25. 2026-07-27 17:51 UTCGHSA enrichment
  26. 2026-07-27 14:14 UTCEPSS rescore
  27. 2026-07-26 14:54 UTCEPSS rescore
  28. 2026-07-26 14:54 UTCEPSS rescore
  29. 2026-07-26 11:01 UTCEG score recompute
  30. 2026-07-26 11:01 UTCVendor advisory
  31. 2026-07-26 11:01 UTCGHSA enrichment
  32. 2026-07-25 14:18 UTCEPSS rescore
  33. 2026-07-25 14:18 UTCEPSS rescore
  34. 2026-07-24 14:18 UTCEPSS rescore
  35. 2026-07-24 14:18 UTCEPSS rescore
  36. 2026-07-23 14:18 UTCEPSS rescore
  37. 2026-07-23 14:18 UTCEPSS rescore
  38. 2026-07-23 03:22 UTCEG score recompute
  39. 2026-07-22 14:08 UTCEPSS rescore
  40. 2026-07-22 14:08 UTCEPSS rescore
  41. 2026-07-20 17:37 UTCEG score recompute
  42. 2026-07-20 17:37 UTCGHSA enrichment
  43. 2026-07-20 17:08 UTCEPSS rescore
  44. 2026-07-19 17:49 UTCNVD update
  45. 2026-07-19 15:23 UTCEG score recompute
  46. 2026-07-19 15:19 UTCMITRE cvelistV5first tracked

Frequently asked(4)

What is CVE-2026-63899?
CVE-2026-63899 is a publicly disclosed vulnerability published on July 19, 2026. In the Linux kernel, the following vulnerability has been resolved: USB: serial: mxuport: fix memory corruption with small endpoint Make sure that the bulk-out endpoint max packet size is at least eight bytes to avoid user-controlled slab corruption should a malicious device report a smaller size.
When was CVE-2026-63899 disclosed?
CVE-2026-63899 was first published in the National Vulnerability Database on July 19, 2026, with the most recent update on July 27, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-63899 actively exploited?
CVE-2026-63899 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 86.9% of all scored CVEs.
How do I remediate CVE-2026-63899?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-63899, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-63899

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