{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2026-72422",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-72422",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-08-15T05:56:41.090Z",
    "updatedAt": "2026-08-17T05:44:02.758Z",
    "importedAt": "2026-10-24T01:58:25.636Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "ksmbd: fix use-after-free of conn->preauth_info in concurrent SMB2 NEGOTIATE",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix use-after-free of conn->preauth_info in concurrent SMB2 NEGOTIATE\n\nconn->preauth_info is shared connection state (struct\npreauth_integrity_info, kmalloc-96) that is allocated and freed by the\nSMB2 NEGOTIATE handler and read by the response send path.\n\nsmb2_handle_negotiate() allocates conn->preauth_info, and on a\ndeassemble_neg_contexts() failure kfrees it and sets it to NULL. Both the\nallocation and the free/NULL happen under ksmbd_conn_lock(conn) (the\nconnection srv_mutex), which is held across the whole handler body.\n\nThe response send path smb3_preauth_hash_rsp(), called from the send:\nblock of __handle_ksmbd_work(), reads conn->preauth_info and dereferences\nconn->preauth_info->Preauth_HashValue (via\nksmbd_gen_preauth_integrity_hash()) without taking conn_lock. When a\nclient drives two SMB2 NEGOTIATE requests on the same connection, one\nworker can free conn->preauth_info on the failing-negotiate path while a\nconcurrent send-path worker is reading it, producing a slab\nuse-after-free read (KASAN-confirmed).\n\nThe send-path read tested conn->preauth_info for NULL but raced with the\nfree that occurs between the NULL check and the dereference, so the NULL\nguard alone does not close the window.\n\nSerialize the NEGOTIATE-branch read in smb3_preauth_hash_rsp() under\nksmbd_conn_lock(conn) and re-check conn->preauth_info inside the lock.\nBecause the negotiate handler holds conn_lock across its kfree + NULL\nassignment, a reader that also takes conn_lock either runs fully before\nthe allocation or fully after the NULL store, and can never observe the\nfreed-but-not-yet-NULLed pointer. ksmbd_gen_preauth_integrity_hash()\ntakes no locks itself (it only computes a SHA-512 over the buffer), so\nno lock-ordering inversion is introduced, and conn_lock is a sleepable\nmutex which is safe on this send path (it already performs network I/O).",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "dd4e4c811898410e6a3ae3b63207b7c542860907",
              "status": "affected",
              "versionType": "git",
              "lessThan": "c7bef84740d1d57848c74f6f5b996606e43ea4fe"
            },
            {
              "version": "aa7253c2393f6dcd6a1468b0792f6da76edad917",
              "status": "affected",
              "versionType": "git",
              "lessThan": "d0a469122e7bf8338fec1949fb1e8e1290ed8caa"
            },
            {
              "version": "aa7253c2393f6dcd6a1468b0792f6da76edad917",
              "status": "affected",
              "versionType": "git",
              "lessThan": "7470511d085af1c7a043a60e53d52b512d5a10b1"
            },
            {
              "version": "aa7253c2393f6dcd6a1468b0792f6da76edad917",
              "status": "affected",
              "versionType": "git",
              "lessThan": "16a1ecf39c217e3d164bd32ef2a4f650abc067fa"
            },
            {
              "version": "aa7253c2393f6dcd6a1468b0792f6da76edad917",
              "status": "affected",
              "versionType": "git",
              "lessThan": "77bb0bbfcc4e777ca653174689e5e363f8ee63d1"
            },
            {
              "version": "aa7253c2393f6dcd6a1468b0792f6da76edad917",
              "status": "affected",
              "versionType": "git",
              "lessThan": "1c89da3baa2b1f269178afa87dc30479b8535776"
            },
            {
              "version": "aa7253c2393f6dcd6a1468b0792f6da76edad917",
              "status": "affected",
              "versionType": "git",
              "lessThan": "0c054227479ed7e36ebccb3a558bc0ef698264f6"
            },
            {
              "version": "8a8315a5960bd2b5ffc75f44fc089e57c3b17c44",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "ff20f1875889dbe4a67c9298e609d7c88cf6456d",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "5.15.61",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "5.15.212"
            },
            {
              "version": "5.18.18",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "5.19"
            },
            {
              "version": "5.19.2",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "5.20"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "6.0",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "6.0"
            },
            {
              "version": "5.15.212",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "6.1.178",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.6.145",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.12.97",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.18.40",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "version": "7.1.5",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "version": "7.2",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}