CVE-2026-64393 (GCVE-0-2026-64393)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:50 – Updated: 2026-07-27 05:00
VLAI
Title
ksmbd: run set info with opener credentials
Summary
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.
Severity
9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < 5cbabf3a71575cd31bc7785d92d4ab42338a654b (git)
Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < b35afd5cf8fab236ef21117e42ee45691d4ffa7b (git)
Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < 0ce682867fd506f61f40c76bde7e4205bde34e87 (git)
Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < 20ee516a62989a8d505ee432f9e59525ea23984e (git)
Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < 8cc9ec711f5255167247a9ab6a7179b787426ed7 (git)
Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < b383bcad3d2fe634b26efbce53e22bbb5753a520 (git)
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Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.96 , ≤ 6.12.* (semver)
Unaffected: 6.18.39 , ≤ 6.18.* (semver)
Unaffected: 7.1.4 , ≤ 7.1.* (semver)
Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix)
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    "dateReserved": "2026-07-19T15:36:31.785Z",
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    "redhat_vex": {
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      "cve": "CVE-2026-64393",
      "id": "CVE-2026-64393",
      "initial_release_date": "2026-07-25T00:00:00+00:00",
      "product_status:known_not_affected": "275",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ksmbd: run set info with opener credentials",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64393.json",
      "version": "3"
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    "suse_vex": {
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      "cve": "CVE-2026-64393",
      "id": "CVE-2026-64393",
      "initial_release_date": "2026-07-25T16:00:11Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64393",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64393.json",
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}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.