CVE-2026-64392

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: use opener credentials for delete-on-close

Delete-on-close can be completed by deferred or durable handle teardown, where no request work is available. Both the base-file unlink and the ADS xattr removal consequently run with the ksmbd worker credentials and can bypass filesystem permission checks.

Run both operations with the credentials captured in struct file when the handle was opened. This preserves the authenticated user's fsuid, fsgid, supplementary groups and capability restrictions at final close.

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
39%
KEV
Not listed

Published

July 25, 2026

Last Modified

September 4, 2026

Advisory Details (5)

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

ksmbd: use opener credentials for delete-on-close - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f08b3f451f12eee4abd8a5981803bc36db84458b
generic

ksmbd: use opener credentials for delete-on-close - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/e72c15085b6d86f45d224d98aa75b5cace4aaab9
generic

ksmbd: use opener credentials for delete-on-close - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/52e2f21911158ec961cd5aae19c56460db382af0
generic

ksmbd: use opener credentials for delete-on-close - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/4b7059974549d278e30fe70e2a4e421f9839817d
generic

ksmbd: use opener credentials for delete-on-close - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/18c59109bb6fb816d5102171666f87cf1e29901d

Vendor Advisories for CVE-2026-64392(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-26.04-edge (7.0.0-31.31) @ resolute2026-09-15ubuntu
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

(4 across 3 ecosystems)
Debian:12(2)
PackageVulnerable rangeFixed inDependents
linux6.1.106-1 ... 7.2~rc7-1~exp1 (352 versions)——
linux-6.12—6.12.100-1~deb12u1—
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 54× in last 7d / 180× 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 359 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 10:15 UTCVendor advisory
  7. 2026-09-14 10:15 UTCGHSA enrichment
  8. 2026-09-14 05:38 UTCVendor advisory
  9. 2026-09-14 05:38 UTCGHSA enrichment
  10. 2026-09-14 01:35 UTCVendor advisory
  11. 2026-09-14 01:35 UTCGHSA enrichment
  12. 2026-09-13 21:31 UTCEG score recompute
  13. 2026-09-13 21:31 UTCVendor advisory
  14. 2026-09-13 21:31 UTCGHSA enrichment
  15. 2026-09-13 15:23 UTCVendor advisory
  16. 2026-09-13 15:23 UTCGHSA enrichment
  17. 2026-09-13 11:11 UTCVendor advisory
  18. 2026-09-13 11:11 UTCGHSA enrichment
  19. 2026-09-13 06:12 UTCVendor advisory
  20. 2026-09-13 06:12 UTCGHSA enrichment
  21. 2026-09-13 01:59 UTCVendor advisory
  22. 2026-09-13 01:59 UTCGHSA enrichment
  23. 2026-09-12 21:55 UTCVendor advisory
  24. 2026-09-12 21:55 UTCGHSA enrichment
  25. 2026-09-12 17:40 UTCEG score recompute
Show 75 more
  1. 2026-09-12 17:40 UTCVendor advisory
  2. 2026-09-12 17:40 UTCGHSA enrichment
  3. 2026-09-12 13:17 UTCVendor advisory
  4. 2026-09-12 13:17 UTCGHSA enrichment
  5. 2026-09-12 09:13 UTCVendor advisory
  6. 2026-09-12 09:13 UTCGHSA enrichment
  7. 2026-09-12 04:59 UTCVendor advisory
  8. 2026-09-12 04:59 UTCGHSA enrichment
  9. 2026-09-12 00:45 UTCVendor advisory
  10. 2026-09-12 00:45 UTCGHSA enrichment
  11. 2026-09-11 20:27 UTCVendor advisory
  12. 2026-09-11 20:27 UTCGHSA enrichment
  13. 2026-09-11 16:22 UTCEG score recompute
  14. 2026-09-11 16:22 UTCVendor advisory
  15. 2026-09-11 16:22 UTCGHSA enrichment
  16. 2026-09-11 14:53 UTCEPSS rescore
  17. 2026-09-11 09:37 UTCEPSS rescore
  18. 2026-09-11 07:10 UTCVendor advisory
  19. 2026-09-11 07:10 UTCGHSA enrichment
  20. 2026-09-11 02:13 UTCVendor advisory
  21. 2026-09-11 02:13 UTCGHSA enrichment
  22. 2026-09-10 20:51 UTCVendor advisory
  23. 2026-09-10 20:51 UTCGHSA enrichment
  24. 2026-09-10 13:19 UTCEG score recompute
  25. 2026-09-10 13:19 UTCVendor advisory
  26. 2026-09-10 13:18 UTCGHSA enrichment
  27. 2026-09-09 08:35 UTCEG score recompute
  28. 2026-09-09 08:35 UTCVendor advisory
  29. 2026-09-09 08:35 UTCGHSA enrichment
  30. 2026-09-08 22:01 UTCEPSS rescore
  31. 2026-09-08 01:19 UTCVendor advisory
  32. 2026-09-08 01:18 UTCGHSA enrichment
  33. 2026-09-07 21:15 UTCEG score recompute
  34. 2026-09-07 21:15 UTCVendor advisory
  35. 2026-09-07 21:15 UTCGHSA enrichment
  36. 2026-09-07 16:01 UTCEPSS rescore
  37. 2026-09-06 16:38 UTCEG score recompute
  38. 2026-09-06 16:38 UTCGHSA enrichment
  39. 2026-09-06 13:47 UTCEPSS rescore
  40. 2026-09-06 12:01 UTCGHSA enrichment
  41. 2026-09-06 07:58 UTCGHSA enrichment
  42. 2026-09-06 03:37 UTCGHSA enrichment
  43. 2026-09-05 23:23 UTCGHSA enrichment
  44. 2026-09-05 19:20 UTCEG score recompute
  45. 2026-09-05 19:20 UTCGHSA enrichment
  46. 2026-09-05 15:31 UTCEPSS rescore
  47. 2026-09-05 06:01 UTCGHSA enrichment
  48. 2026-09-04 19:22 UTCGHSA enrichment
  49. 2026-09-04 17:05 UTCEG score recompute
  50. 2026-09-04 17:05 UTCGHSA enrichment
  51. 2026-09-04 12:40 UTCEG score recompute
  52. 2026-09-04 12:40 UTCGHSA enrichment
  53. 2026-09-04 05:07 UTCEPSS rescore
  54. 2026-09-02 14:12 UTCEPSS rescore
  55. 2026-09-01 23:13 UTCEG score recompute
  56. 2026-09-01 23:13 UTCGHSA enrichment
  57. 2026-09-01 13:54 UTCEPSS rescore
  58. 2026-09-01 04:40 UTCEPSS rescore
  59. 2026-08-31 04:44 UTCGHSA enrichment
  60. 2026-08-31 00:41 UTCGHSA enrichment
  61. 2026-08-30 20:37 UTCEG score recompute
  62. 2026-08-30 20:37 UTCGHSA enrichment
  63. 2026-08-30 19:17 UTCEPSS rescore
  64. 2026-08-30 16:34 UTCGHSA enrichment
  65. 2026-08-30 12:30 UTCGHSA enrichment
  66. 2026-08-30 08:13 UTCGHSA enrichment
  67. 2026-08-30 04:09 UTCEG score recompute
  68. 2026-08-30 04:09 UTCGHSA enrichment
  69. 2026-08-30 01:22 UTCEPSS rescore
  70. 2026-08-30 00:05 UTCEG score recompute
  71. 2026-08-30 00:05 UTCGHSA enrichment
  72. 2026-08-28 21:42 UTCEPSS rescore
  73. 2026-08-28 01:28 UTCGHSA enrichment
  74. 2026-08-27 21:06 UTCEG score recompute
  75. 2026-08-27 21:05 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-64392?
CVE-2026-64392 is a critical vulnerability published on July 25, 2026. In the Linux kernel, the following vulnerability has been resolved: ksmbd: use opener credentials for delete-on-close Delete-on-close can be completed by deferred or durable handle teardown, where no request work is available. Both the base-file unlink and the ADS xattr removal consequently run…
When was CVE-2026-64392 disclosed?
CVE-2026-64392 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-2026-64392 actively exploited?
CVE-2026-64392 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 60.8% of all scored CVEs.
What is the CVSS score of CVE-2026-64392?
CVE-2026-64392 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2026-64392?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-64392, 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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