CVE-2026-64393

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-25. a secondary CVSS source baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.1Exploit: None knownExposed: 0

A fix is available — apply it.

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

ksmbd: run set info with opener credentials

SMB2 SET_INFO handlers call path-based VFS helpers after checking the access mask granted to the SMB handle. Those helpers perform their owner, inode permission and LSM checks using the current ksmbd worker credentials.

Run the complete SET_INFO dispatch with the credentials captured when the handle was opened. This also removes the separate security information credential setup and keeps all SET_INFO classes under one credential scope.

Direct override_creds() is used because it can nest with the request credential overrides already used by rename and link helpers.

CVSS v3
9.1
EG Score
9.1(medium)
EG Risk
46(Track)
EG Risk 46/100SSVC: 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
Severity91% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
40%
KEV
Not listed

Published

July 25, 2026

Last Modified

September 4, 2026

Advisory Details (6)

Auto-updated Sep 15, 2026
No patch confirmed yet.
generic

ksmbd: run set info with opener credentials - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/b383bcad3d2fe634b26efbce53e22bbb5753a520
generic

ksmbd: run set info with opener credentials - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/b35afd5cf8fab236ef21117e42ee45691d4ffa7b
generic

ksmbd: run set info with opener credentials - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/8cc9ec711f5255167247a9ab6a7179b787426ed7
generic

ksmbd: run set info with opener credentials - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/5cbabf3a71575cd31bc7785d92d4ab42338a654b
generic

ksmbd: run set info with opener credentials - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/20ee516a62989a8d505ee432f9e59525ea23984e
generic

ksmbd: run set info with opener credentials - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/0ce682867fd506f61f40c76bde7e4205bde34e87

Vendor Advisories for CVE-2026-64393(2)

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

Patch Availability(4)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-virtual-hwe-24.04-edge (7.0.0-31.31~24.04.1) @ noble2026-09-15ubuntu
ubuntulinux-tools-gcp-edge (7.0.0-1011.11~24.04.1) @ noble2026-09-15ubuntu
ubuntulinux-tools-oem-7.0 (7.0.0-1013.13) @ resolute2026-09-15ubuntu
ubuntulinux-tools-nvidia-hwe-24.04-edge (7.0.0-1018.18~24.04.1) @ noble2026-09-15ubuntu

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—

All Vendor Advisories

(4)

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 58× in last 7d / 190× 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 375 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-64393?
CVE-2026-64393 is a critical vulnerability published on July 25, 2026. In the Linux kernel, the following vulnerability has been resolved: ksmbd: run set info with opener credentials SMB2 SET_INFO handlers call path-based VFS helpers after checking the access mask granted to the SMB handle. Those helpers perform their owner, inode permission and LSM checks using the…
When was CVE-2026-64393 disclosed?
CVE-2026-64393 was first published in the National Vulnerability Database on July 25, 2026, with the most recent update on September 4, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-64393 actively exploited?
CVE-2026-64393 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 60.0% of all scored CVEs.
What is the CVSS score of CVE-2026-64393?
CVE-2026-64393 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2026-64393?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-64393, 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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