CVE-2026-90169

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: free preauth sessions on connection teardown SMB3.1.1 multichannel binding preserves the preauthentication hash in a preauth_session between the NTLM negotiate and authenticate requests. The binding NTLM negotiate allocates this object and returns STATUS_MORE_PROCESSING_REQUIRED. If the client disconnects before it sends the authenticate request, neither the authenticate nor error cleanup paths free the object. Release any remaining preauthentication sessions when tearing down the connection. Initialize the list when allocating the connection so that this cleanup is safe regardless of the negotiated dialect.

Severity

Not scored

CVSS score

Not available

Vulnerability status

Received

Source identifier

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-09-17 17:17:10.333000

Last modified

2026-10-30 13:20:44.900000

View original CVE JSON

{
  "id": "CVE-2026-90169",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-09-17T17:17:10.333",
  "lastModified": "2026-10-30T13:20:44.900",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: free preauth sessions on connection teardown\n\nSMB3.1.1 multichannel binding preserves the preauthentication hash in a\npreauth_session between the NTLM negotiate and authenticate requests.\nThe binding NTLM negotiate allocates this object and returns\nSTATUS_MORE_PROCESSING_REQUIRED. If the client disconnects before it sends\nthe authenticate request, neither the authenticate nor error cleanup paths\nfree the object.\n\nRelease any remaining preauthentication sessions when tearing down the\nconnection. Initialize the list when allocating the connection so that this\ncleanup is safe regardless of the negotiated dialect."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "fs/smb/server/connection.c",
            "fs/smb/server/mgmt/user_session.c",
            "fs/smb/server/mgmt/user_session.h",
            "fs/smb/server/smb2ops.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "f5a544e3bab78142207e0242d22442db85ba1eff",
              "lessThan": "1f60a88b2e0203e50f65b0fb9c32ecb0ae0aa683",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "f5a544e3bab78142207e0242d22442db85ba1eff",
              "lessThan": "effcf48d79d8aa53113d8289e140746f25ceb62c",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "f5a544e3bab78142207e0242d22442db85ba1eff",
              "lessThan": "b62b1ebb25f0a19067ed5b1a86036b2dc98be44f",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "f5a544e3bab78142207e0242d22442db85ba1eff",
              "lessThan": "a41a98ee16ae038751b6639decadaa3ce15ca18a",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "f5a544e3bab78142207e0242d22442db85ba1eff",
              "lessThan": "8e2ebc77678832e981adc008d25cd8f67d08ebc4",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "f5a544e3bab78142207e0242d22442db85ba1eff",
              "lessThan": "06c7b1d731bc105a8644f1b70165ba8b9416cbab",
              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "fs/smb/server/connection.c",
            "fs/smb/server/mgmt/user_session.c",
            "fs/smb/server/mgmt/user_session.h",
            "fs/smb/server/smb2ops.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "5.15",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "5.15",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.1.191",
              "lessThanOrEqual": "6.1.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.6.157",
              "lessThanOrEqual": "6.6.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.110",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.52",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2.6",
              "lessThanOrEqual": "7.2.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.3",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {},
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/06c7b1d731bc105a8644f1b70165ba8b9416cbab",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/1f60a88b2e0203e50f65b0fb9c32ecb0ae0aa683",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/8e2ebc77678832e981adc008d25cd8f67d08ebc4",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/a41a98ee16ae038751b6639decadaa3ce15ca18a",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/b62b1ebb25f0a19067ed5b1a86036b2dc98be44f",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/effcf48d79d8aa53113d8289e140746f25ceb62c",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}