CVE-2026-64336

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2026-07-25. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 4 sources updated this week
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

A fix is available — apply it.

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

USB: serial: keyspan_pda: fix information leak

The write() callback is supposed to return the number of characters accepted or a negative errno. Since the addition of write fifo support the keyspan_pda implementation will however return the number characters submitted to the device if the write urb is not already in use. If this number is larger than the number of characters passed to write(), the line discipline continues writing data from beyond the tty write buffer.

Fix the information leak by making sure that keyspan_pda_write_start() returns zero on success as intended.

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

July 25, 2026

Last Modified

September 14, 2026

Advisory Details (8)

Auto-updated Sep 3, 2026
No patch confirmed yet.
generic

USB: serial: keyspan_pda: fix information leak - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/e52ca411f50539ff1d0c877b9312771ca8a858c1
generic

USB: serial: keyspan_pda: fix information leak - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/e1494191a3aac665d3a2fce16169a97c346253ec
generic

USB: serial: keyspan_pda: fix information leak - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/d4b12b6b395e43a2b1d80be3745631fcaa9c047b
generic

USB: serial: keyspan_pda: fix information leak - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/cf6ca0aefae03958cfb5b189b0adbfb25c06bfac
generic

USB: serial: keyspan_pda: fix information leak - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/cccef1711efbcdbe999738ac27d37b9ef6271abd
generic

USB: serial: keyspan_pda: fix information leak - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/b069b7029862fafaff331d4c664d97d4ae828d6d
generic

USB: serial: keyspan_pda: fix information leak - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/6bfc8d01ac4068eced509f8fc74d0cd205e4dcec
generic

USB: serial: keyspan_pda: fix information leak - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/2f7a6b8ab3845bd1da02604f1a874b52a4555a72

Vendor Advisories for CVE-2026-64336(2)

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 (7.0.0-1019.19) @ resolute2026-09-20ubuntu
ubuntulinux-virtual-hwe-26.04-edge (7.0.0-31.31) @ resolute2026-09-20ubuntu
ubuntulinux-tools-gcp-edge (7.0.0-1011.11~24.04.1) @ noble2026-09-20ubuntu
ubuntulinux-tools-nvidia-hwe-24.04-edge (7.0.0-1018.18~24.04.1) @ noble2026-09-20ubuntu
ubuntulinux-tools-oem-7.0 (7.0.0-1013.13) @ resolute2026-09-20ubuntu

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

(5 across 4 ecosystems)
Debian:12(2)
PackageVulnerable rangeFixed inDependents
linux6.1.106-1 ... 6.1.99-1 (55 versions)6.1.180-1—
linux-6.12—6.12.100-1~deb12u1—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
linux-6.16.1.106-3~deb11u1 ... 6.1.177-1~deb11u1 (22 versions)6.1.180-1~deb11u1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux6.12.38-1 ... 6.12.95-1~bpo12+1 (30 versions)6.12.96-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 7.1~rc7-1~exp1 (158 versions)7.1.4-1—

Weakness Classification(1)

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

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 21× in last 7d / 69× 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 115 total refreshes for this CVE.

  1. 2026-09-20 20:16 UTCEPSS rescore
  2. 2026-09-20 01:30 UTCEG score recompute
  3. 2026-09-20 01:30 UTCVendor advisory
  4. 2026-09-20 01:30 UTCGHSA enrichment
  5. 2026-09-18 19:28 UTCEPSS rescore
  6. 2026-09-18 09:46 UTCEG score recompute
  7. 2026-09-18 09:46 UTCVendor advisory
  8. 2026-09-18 09:46 UTCGHSA enrichment
  9. 2026-09-17 09:12 UTCEG score recompute
  10. 2026-09-17 09:12 UTCVendor advisory
  11. 2026-09-17 09:12 UTCGHSA enrichment
  12. 2026-09-16 14:08 UTCEPSS rescore
  13. 2026-09-16 06:32 UTCEG score recompute
  14. 2026-09-16 06:32 UTCVendor advisory
  15. 2026-09-16 06:32 UTCGHSA enrichment
  16. 2026-09-16 05:15 UTCEPSS rescore
  17. 2026-09-14 12:34 UTCVendor advisory
  18. 2026-09-14 12:34 UTCGHSA enrichment
  19. 2026-09-14 12:00 UTCEG score recompute
  20. 2026-09-14 12:00 UTCVendor advisory
  21. 2026-09-14 12:00 UTCGHSA enrichment
  22. 2026-09-13 16:38 UTCVendor advisory
  23. 2026-09-13 16:38 UTCGHSA enrichment
  24. 2026-09-12 16:34 UTCEG score recompute
  25. 2026-09-12 16:34 UTCVendor advisory
Show 75 more
  1. 2026-09-12 16:34 UTCGHSA enrichment
  2. 2026-09-11 16:27 UTCEG score recompute
  3. 2026-09-11 16:27 UTCVendor advisory
  4. 2026-09-11 16:27 UTCGHSA enrichment
  5. 2026-09-11 14:53 UTCEPSS rescore
  6. 2026-09-11 09:37 UTCEPSS rescore
  7. 2026-09-10 13:27 UTCEG score recompute
  8. 2026-09-10 13:27 UTCVendor advisory
  9. 2026-09-10 13:27 UTCGHSA enrichment
  10. 2026-09-09 08:38 UTCEG score recompute
  11. 2026-09-09 08:38 UTCVendor advisory
  12. 2026-09-09 08:38 UTCGHSA enrichment
  13. 2026-09-08 22:01 UTCEPSS rescore
  14. 2026-09-07 21:17 UTCEG score recompute
  15. 2026-09-07 21:17 UTCVendor advisory
  16. 2026-09-07 21:17 UTCGHSA enrichment
  17. 2026-09-07 16:01 UTCEPSS rescore
  18. 2026-09-06 13:47 UTCEPSS rescore
  19. 2026-09-05 19:21 UTCEG score recompute
  20. 2026-09-05 19:21 UTCGHSA enrichment
  21. 2026-09-05 15:31 UTCEPSS rescore
  22. 2026-09-04 16:22 UTCEG score recompute
  23. 2026-09-04 16:22 UTCGHSA enrichment
  24. 2026-09-04 05:07 UTCEPSS rescore
  25. 2026-09-03 16:17 UTCEG score recompute▲ 5.50
  26. 2026-09-03 16:17 UTCGHSA enrichment
  27. 2026-09-03 16:12 UTCNVD updateCVSS v3 → 5.5 · severity → MEDIUM
  28. 2026-09-02 14:12 UTCEPSS rescore
  29. 2026-09-02 00:51 UTCGHSA enrichment
  30. 2026-09-01 13:54 UTCEPSS rescore
  31. 2026-09-01 04:40 UTCEPSS rescore
  32. 2026-08-30 19:17 UTCEPSS rescore
  33. 2026-08-30 01:22 UTCEPSS rescore
  34. 2026-08-30 00:10 UTCGHSA enrichment
  35. 2026-08-28 21:42 UTCEPSS rescore
  36. 2026-08-26 14:47 UTCEPSS rescore
  37. 2026-08-26 13:52 UTCGHSA enrichment
  38. 2026-08-25 13:49 UTCEPSS rescore
  39. 2026-08-23 13:21 UTCGHSA enrichment
  40. 2026-08-23 13:19 UTCNVD update
  41. 2026-08-23 13:09 UTCGHSA enrichment
  42. 2026-08-23 13:05 UTCMITRE cvelistV5
  43. 2026-08-23 06:22 UTCGHSA enrichment
  44. 2026-08-23 00:19 UTCEPSS rescore
  45. 2026-08-21 23:49 UTCEPSS rescore
  46. 2026-08-20 22:55 UTCEPSS rescore
  47. 2026-08-20 05:51 UTCGHSA enrichment
  48. 2026-08-19 17:04 UTCEPSS rescore
  49. 2026-08-18 13:48 UTCEPSS rescore
  50. 2026-08-17 13:47 UTCEPSS rescore
  51. 2026-08-17 05:25 UTCNVD update
  52. 2026-08-17 05:20 UTCGHSA enrichment
  53. 2026-08-17 05:05 UTCMITRE cvelistV5
  54. 2026-08-16 14:56 UTCEPSS rescore
  55. 2026-08-15 01:30 UTCEPSS rescore
  56. 2026-08-14 15:39 UTCGHSA enrichment
  57. 2026-08-12 13:51 UTCEPSS rescore
  58. 2026-08-11 15:08 UTCGHSA enrichment
  59. 2026-08-11 00:00 UTCEPSS rescore
  60. 2026-08-10 05:27 UTCGHSA enrichment
  61. 2026-08-09 13:47 UTCEPSS rescore
  62. 2026-08-08 16:37 UTCEPSS rescore
  63. 2026-08-07 04:57 UTCGHSA enrichment
  64. 2026-08-06 13:47 UTCEPSS rescore
  65. 2026-08-05 19:17 UTCEPSS rescore
  66. 2026-08-05 19:17 UTCEPSS rescore
  67. 2026-08-04 15:10 UTCEPSS rescore
  68. 2026-08-04 10:39 UTCEPSS rescore
  69. 2026-08-04 04:27 UTCGHSA enrichment
  70. 2026-08-03 10:36 UTCEPSS rescore
  71. 2026-08-02 02:27 UTCEPSS rescore
  72. 2026-08-01 04:16 UTCEPSS rescore
  73. 2026-08-01 03:56 UTCEG score recompute
  74. 2026-08-01 03:56 UTCGHSA enrichment
  75. 2026-07-30 16:28 UTCEPSS rescore

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-64336?
CVE-2026-64336 is a medium vulnerability published on July 25, 2026. In the Linux kernel, the following vulnerability has been resolved: USB: serial: keyspan_pda: fix information leak The write() callback is supposed to return the number of characters accepted or a negative errno. Since the addition of write fifo support the keyspan_pda implementation will however…
When was CVE-2026-64336 disclosed?
CVE-2026-64336 was first published in the National Vulnerability Database on July 25, 2026, with the most recent update on September 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-64336 actively exploited?
CVE-2026-64336 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-2026-64336?
CVE-2026-64336 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-64336?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-64336, 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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