CVE-2026-64138

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-07-19. a secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.8Exploit: None knownExposed: 0

A fix is available — apply it.

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

ksmbd: validate SID in parent security descriptor during ACL inheritance

Introduce smb_validate_ntsd_sid() helper to safely validate Owner SID and Group SID inside the NT Security Descriptor (smb_ntsd) retrieved from the parent directory.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
44(Track)
EG Risk 44/100SSVC: 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
Severity88% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
35%
KEV
Not listed

Published

July 19, 2026

Last Modified

August 18, 2026

Advisory Details (4)

Auto-updated Jul 20, 2026
No patch confirmed yet.
generic

ksmbd: validate SID in parent security descriptor during ACL inheritance - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f0e5c9c663badc9982e6941322eef1cb17de0f11
generic

ksmbd: validate SID in parent security descriptor during ACL inheritance - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/69f030cf95488ae1186c72ac8c66fd279664ea7f
generic

ksmbd: validate SID in parent security descriptor during ACL inheritance - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/1c9d0646a9959752f11ca1080dc1ff26bd1756cb
generic

ksmbd: validate SID in parent security descriptor during ACL inheritance - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/18d8db24b0a5b7be4829238dd4022236df02d421

Vendor Advisories for CVE-2026-64138(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 / EcosystemFixed in / PatchReleasedSource
ubuntulinux-tools-oracle-7.0 (7.0.0-1008.8) @ resolute2026-09-18ubuntu
ubuntulinux-tools-azure-fde-7.0 (7.0.0-1009.9) @ resolute2026-09-18ubuntu
ubuntulinux-tools-raspi-realtime-7.0 (7.0.0-1015.15) @ resolute2026-09-18ubuntu
ubuntulinux-tools-nvidia-hwe-24.04-edge (7.0.0-1016.16) @ resolute2026-09-18ubuntu
ubuntulinux-tools-nvidia-hwe-26.04 (7.0.0-2016.16) @ resolute2026-09-18ubuntu
ubuntulinux-virtual-6.8 (6.8.0-139.139) @ noble2026-09-18ubuntu
ubuntulinux-tools-gcp-edge (7.0.0-1011.11~24.04.1) @ noble2026-09-18ubuntu
ubuntulinux-tools-azure-lts-24.04 (6.8.0-1067.75) @ noble2026-09-18ubuntu

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

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux6.1.106-1 ... 7.2~rc7-1~exp1 (350 versions)——
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 (141 versions)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 19× in last 7d / 99× 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 277 total refreshes for this CVE.

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

Related CVEs(same vendor)

Frequently asked(5)

What is CVE-2026-64138?
CVE-2026-64138 is a high vulnerability published on July 19, 2026. In the Linux kernel, the following vulnerability has been resolved: ksmbd: validate SID in parent security descriptor during ACL inheritance Introduce smbvalidatentsd_sid() helper to safely validate Owner SID and Group SID inside the NT Security Descriptor (smb_ntsd) retrieved from the parent…
When was CVE-2026-64138 disclosed?
CVE-2026-64138 was first published in the National Vulnerability Database on July 19, 2026, with the most recent update on August 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-64138 actively exploited?
CVE-2026-64138 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 64.5% of all scored CVEs.
What is the CVSS score of CVE-2026-64138?
CVE-2026-64138 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-64138?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-64138, 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-2026-64138

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