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smb: client: reject userspace cifs.spnego descriptions

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: smb: client: reject userspace cifs.spnego descriptions cifs.spnego key descriptions contain authority-bearing fields such as pid, uid, creduid, and upcall_target that cifs.upcall treats as kernel-originating inputs. However, userspace can also create keys of this type through request_key(2) or add_key(2), allowing those fields to be supplied without CIFS origin. Only accept cifs.spnego descriptions while CIFS is using its private spnego_cred to request the key.

Announced Source revision 1
Original source ↗

CVE-2026-46243

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-2026-46243

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": "f1d662a7d5e5322e583aad6b3cfec03d8f27b435",
        "lessThan": "7713bd320ed4fc3d08a227cd8e41242219a16981",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f1d662a7d5e5322e583aad6b3cfec03d8f27b435",
        "lessThan": "9544559e59438a4b609b2fdfa0763d8360572824",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f1d662a7d5e5322e583aad6b3cfec03d8f27b435",
        "lessThan": "cf20038657d6d4974349556a34e08fe0490bebbc",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f1d662a7d5e5322e583aad6b3cfec03d8f27b435",
        "lessThan": "2035acfb17221729b1b8ac335e941868a04ca079",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f1d662a7d5e5322e583aad6b3cfec03d8f27b435",
        "lessThan": "a3bbda6502a9398b816fa2e71c9a3f955f58013d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f1d662a7d5e5322e583aad6b3cfec03d8f27b435",
        "lessThan": "91f89c1d83e80417629791fcef6af8140d7d01c8",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f1d662a7d5e5322e583aad6b3cfec03d8f27b435",
        "lessThan": "0aece6685fc80a8de492688ca2315fb86ec379c7",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f1d662a7d5e5322e583aad6b3cfec03d8f27b435",
        "lessThan": "3da1fdf4efbc490041eb4f836bf596201203f8f2",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "fs/smb/client/cifs_spnego.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.24"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.24",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.258",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.209",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.175",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.142",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.92",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.34",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.0.11",
        "versionType": "semver",
        "lessThanOrEqual": "7.0.*"
      },
      {
        "status": "unaffected",
        "version": "7.1",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "fs/smb/client/cifs_spnego.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-46243

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#28413 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement