{
  "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-2026-31444",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-31444",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-04-22T13:53:41.351Z",
    "updatedAt": "2026-08-05T12:22:35.585Z",
    "importedAt": "2026-10-24T01:58:02.025Z",
    "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 and NULL deref in smb_grant_oplock()",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix use-after-free and NULL deref in smb_grant_oplock()\n\nsmb_grant_oplock() has two issues in the oplock publication sequence:\n\n1) opinfo is linked into ci->m_op_list (via opinfo_add) before\n   add_lease_global_list() is called.  If add_lease_global_list()\n   fails (kmalloc returns NULL), the error path frees the opinfo\n   via __free_opinfo() while it is still linked in ci->m_op_list.\n   Concurrent m_op_list readers (opinfo_get_list, or direct iteration\n   in smb_break_all_levII_oplock) dereference the freed node.\n\n2) opinfo->o_fp is assigned after add_lease_global_list() publishes\n   the opinfo on the global lease list.  A concurrent\n   find_same_lease_key() can walk the lease list and dereference\n   opinfo->o_fp->f_ci while o_fp is still NULL.\n\nFix by restructuring the publication sequence to eliminate post-publish\nfailure:\n\n- Set opinfo->o_fp before any list publication (fixes NULL deref).\n- Preallocate lease_table via alloc_lease_table() before opinfo_add()\n  so add_lease_global_list() becomes infallible after publication.\n- Keep the original m_op_list publication order (opinfo_add before\n  lease list) so concurrent opens via same_client_has_lease() and\n  opinfo_get_list() still see the in-flight grant.\n- Use opinfo_put() instead of __free_opinfo() on err_out so that\n  the RCU-deferred free path is used.\n\nThis also requires splitting add_lease_global_list() to take a\npreallocated lease_table and changing its return type from int to void,\nsince it can no longer fail.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "302fef75512b2c8329a3f5efab1ae7ba2562387a",
              "status": "affected",
              "versionType": "git",
              "lessThan": "9e785f004cbc56390479b77375726ea9b0d1a8a6"
            },
            {
              "version": "08aa9f3c8cf4d0bee44df540dfe34e8d64069f2c",
              "status": "affected",
              "versionType": "git",
              "lessThan": "7de55bba69cbf0f9280daaea385daf08bc076121"
            },
            {
              "version": "1d6abf145615dbfe267ce3b0a271f95e3780e18e",
              "status": "affected",
              "versionType": "git",
              "lessThan": "a5c6f6d6ceefed2d5210ee420fb75f8362461f46"
            },
            {
              "version": "ce8507ee82c888126d8e7565e27c016308d24cde",
              "status": "affected",
              "versionType": "git",
              "lessThan": "6d7e5a918c1d0aad06db0e17677b66fc9a471021"
            },
            {
              "version": "1dfd062caa165ec9d7ee0823087930f3ab8a6294",
              "status": "affected",
              "versionType": "git",
              "lessThan": "48623ec358c1c600fa1e38368746f933e0f1a617"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "6.6.130",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "6.6.131"
            },
            {
              "version": "6.12.78",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "6.12.80"
            },
            {
              "version": "6.18.19",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "6.18.21"
            },
            {
              "version": "6.19.9",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "6.19.11"
            }
          ]
        }
      ]
    }
  }
}