CVE-2026-63899

UNRATEDCVSS · not yet scored
—
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • No CVSS published and no exploitation signals yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS v2: —Exploit: None knownExposed services: Not assessed

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
0.2%
EPSS %ILE
12th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

EG Severity
Not assessed: no CVSS publishedA missing CVSS is not a severity of zero.
EG Likelihood
0.2% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-17). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
No SSVC decision: EchelonGraph has not assessed this CVECISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: the BOD 26-04 block below.

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). Where an input reads “CISA's BOD 26-04 default”, no one has published it for this CVE, and CISA's implementation guidance says: “If “Automatable” and “Technical Impact” information items about a CVE ID are not available and the CVE ID is not in the KEV Catalog, CISA will treat its values as “no” and “total,” respectively, until CISA or a third party provides metadata about the CVE ID. CISA will always provide the Vulnrichment data for a CVE ID listed in the KEV Catalog.” Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

July 19, 2026

Last Modified

July 27, 2026

References (8)

Vendor Advisories for CVE-2026-63899(2)

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

Patch Availability(8)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulinux-tools-oracle-7.0 (7.0.0-1008.8) @ resolute2026-10-01ubuntu
ubuntulinux-tools-raspi-realtime-7.0 (7.0.0-1015.15) @ resolute2026-10-01ubuntu
ubuntulinux-tools-nvidia-hwe-24.04-edge (7.0.0-1016.16) @ resolute2026-10-01ubuntu
ubuntulinux-tools-nvidia-hwe-26.04 (7.0.0-2016.16) @ resolute2026-10-01ubuntu
ubuntulinux-tools-gcp-edge (7.0.0-1011.11~24.04.1) @ noble2026-10-01ubuntu
ubuntulinux-tools-azure-fde-7.0 (7.0.0-1009.9) @ resolute2026-10-01ubuntu
ubuntulinux-tools-azure-edge (7.0.0-1014.14~24.04.1) @ noble2026-10-01ubuntu
ubuntulinux-tools-oracle-edge (7.0.0-1011.11~24.04.1) @ noble2026-10-01ubuntu

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 rangeFix by version rangeDependents
linux5.10.103-1 ... 5.10.92-2 (54 versions)
  • every version up to 5.10.259-1: fixed in 5.10.259-1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.1.106-1 ... 6.1.99-1 (53 versions)
  • every version up to 6.1.176-1: fixed in 6.1.176-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.38-1 ... 6.12.94-1~bpo12+1 (27 versions)
  • every version up to 6.12.94-1: fixed in 6.12.94-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 7.0.9-1~bpo13+1 (142 versions)
  • every version up to 7.0.12-1: fixed in 7.0.12-1
—

All Vendor Advisories

(8)

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 8× in last 7d / 36× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 99 of 128 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 1 repeat row among the latest 100 is merged into the row it repeats. The 29 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  2. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  3. 2026-10-18 03:23 UTCEG score recompute
  4. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  5. 2026-10-16 16:43 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  6. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  7. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  8. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  9. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  10. 2026-10-12 15:48 UTCEG score recompute
  11. 2026-10-11 19:33 UTCEG score recompute
  12. 2026-10-11 16:48 UTCEG score recompute
  13. 2026-10-11 14:09 UTCEG score recompute
  14. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  15. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  16. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  17. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  18. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  19. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  20. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  21. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  22. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  23. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  24. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  25. 2026-10-01 10:18 UTCEG score recompute
Show 74 more
  1. 2026-10-01 10:18 UTCVendor advisory
  2. 2026-10-01 10:18 UTCGHSA enrichmentGHSA-9wmf-qj6g-2q9c
  3. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  4. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  5. 2026-09-28 07:32 UTCVendor advisory
  6. 2026-09-28 07:32 UTCGHSA enrichmentGHSA-9wmf-qj6g-2q9c
  7. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  8. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  9. 2026-09-23 02:10 UTCVendor advisory
  10. 2026-09-23 02:10 UTCGHSA enrichmentGHSA-9wmf-qj6g-2q9c
  11. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  12. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  13. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  14. 2026-09-16 13:07 UTCVendor advisory
  15. 2026-09-16 13:07 UTCGHSA enrichmentGHSA-9wmf-qj6g-2q9c
  16. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  17. 2026-09-11 19:41 UTCVendor advisory
  18. 2026-09-11 19:41 UTCGHSA enrichmentGHSA-9wmf-qj6g-2q9c
  19. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  20. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  21. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  22. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  23. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  24. 2026-09-05 20:11 UTCVendor advisory
  25. 2026-09-05 20:10 UTCGHSA enrichmentGHSA-9wmf-qj6g-2q9c
  26. 2026-09-05 15:31 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  27. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  28. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  29. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  30. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  31. 2026-08-31 05:59 UTCVendor advisory
  32. 2026-08-31 05:59 UTCGHSA enrichmentGHSA-9wmf-qj6g-2q9c
  33. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  34. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  35. 2026-08-28 21:42 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  36. 2026-08-28 03:30 UTCVendor advisory
  37. 2026-08-28 03:30 UTCGHSA enrichmentGHSA-9wmf-qj6g-2q9c
  38. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  39. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  40. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  41. 2026-08-25 00:50 UTCVendor advisory
  42. 2026-08-25 00:49 UTCGHSA enrichmentGHSA-9wmf-qj6g-2q9c
  43. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  44. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  45. 2026-08-21 22:20 UTCVendor advisory
  46. 2026-08-21 22:20 UTCGHSA enrichmentGHSA-9wmf-qj6g-2q9c
  47. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  48. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  49. 2026-08-18 19:50 UTCVendor advisory
  50. 2026-08-18 19:50 UTCGHSA enrichmentGHSA-9wmf-qj6g-2q9c
  51. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  52. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  53. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  54. 2026-08-15 09:52 UTCVendor advisory
  55. 2026-08-15 09:52 UTCGHSA enrichmentGHSA-9wmf-qj6g-2q9c
  56. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  57. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  58. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  59. 2026-08-12 07:23 UTCVendor advisory
  60. 2026-08-12 07:23 UTCGHSA enrichmentGHSA-9wmf-qj6g-2q9c
  61. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  62. 2026-08-09 13:47 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  63. 2026-08-09 04:53 UTCVendor advisory
  64. 2026-08-09 04:53 UTCGHSA enrichmentGHSA-9wmf-qj6g-2q9c
  65. 2026-08-06 13:47 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  66. 2026-08-06 02:24 UTCVendor advisory
  67. 2026-08-06 02:24 UTCGHSA enrichmentGHSA-9wmf-qj6g-2q9c
  68. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  69. 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  70. 2026-08-04 10:39 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  71. 2026-08-03 10:36 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  72. 2026-08-02 23:56 UTCVendor advisory
  73. 2026-08-02 23:56 UTCGHSA enrichmentGHSA-9wmf-qj6g-2q9c
  74. 2026-08-02 02:27 UTCEPSS rescoreEPSS 0.2% · 11th percentile

Related CVEs(same vendor)

Frequently asked(4)

What is CVE-2026-63899?
CVE-2026-63899 is a vulnerability whose severity is not yet rated; its CVE record was 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 the CVE record for CVE-2026-63899 published?
The CVE record for CVE-2026-63899 was published on July 19, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of July 27, 2026; the record at its source may have been updated since.
Is CVE-2026-63899 actively exploited?
CVE-2026-63899 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (12th percentile of EPSS-scored CVEs).
How do I remediate CVE-2026-63899?
A fix for CVE-2026-63899 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-63899 are linked in the Vendor Advisories panel on this page.

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