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Critical

ksmbd: use opener credentials for ADS I/O

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: ksmbd: use opener credentials for ADS I/O Alternate data streams are stored as xattrs. Unlike regular file I/O, their read and write paths therefore call VFS xattr helpers which recheck inode permissions and LSM policy using the current task credentials. Run ADS I/O with the credentials captured when the SMB handle was opened.

Announced Source revision 1
Original source ↗

CVE-2026-64391

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-64391

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "f44158485826c076335d6860d35872271a83791d",
        "lessThan": "2ad5509dd576ae16d252d4698daf03002f9e0234",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f44158485826c076335d6860d35872271a83791d",
        "lessThan": "a8f5d39971bbad9340d49cd41b0e2da9452a649d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f44158485826c076335d6860d35872271a83791d",
        "lessThan": "2b4592cea214683de0f2ce6f8c22c097fb0ea1ab",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f44158485826c076335d6860d35872271a83791d",
        "lessThan": "52a56cf53ec834c44ac1b4d16d585f26613ee5ce",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f44158485826c076335d6860d35872271a83791d",
        "lessThan": "baa5e094886fffa7e6272edcb5e08be5ce28262c",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "fs/smb/server/vfs.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.15"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.15",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.6.160",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.96",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.39",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.4",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "fs/smb/server/vfs.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-64391

Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Event
#46437 · Revision 1
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Publisher date
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