{
  "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-2026-31715",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-31715",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-05-01T13:56:10.591Z",
    "updatedAt": "2026-06-19T11:58:02.837Z",
    "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": "f2fs: fix UAF caused by decrementing sbi->nr_pages[] in f2fs_write_end_io()",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix UAF caused by decrementing sbi->nr_pages[] in f2fs_write_end_io()\n\nThe xfstests case \"generic/107\" and syzbot have both reported a NULL\npointer dereference.\n\nThe concurrent scenario that triggers the panic is as follows:\n\nF2FS_WB_CP_DATA write callback          umount\n                                        - f2fs_write_checkpoint\n                                         - f2fs_wait_on_all_pages(sbi, F2FS_WB_CP_DATA)\n- blk_mq_end_request\n - bio_endio\n  - f2fs_write_end_io\n   : dec_page_count(sbi, F2FS_WB_CP_DATA)\n   : wake_up(&sbi->cp_wait)\n                                        - kill_f2fs_super\n                                         - kill_block_super\n                                          - f2fs_put_super\n                                           : iput(sbi->node_inode)\n                                           : sbi->node_inode = NULL\n   : f2fs_in_warm_node_list\n    - is_node_folio // sbi->node_inode is NULL and panic\n\nThe root cause is that f2fs_put_super() calls iput(sbi->node_inode) and\nsets sbi->node_inode to NULL after sbi->nr_pages[F2FS_WB_CP_DATA] is\ndecremented to zero. As a result, f2fs_in_warm_node_list() may\ndereference a NULL node_inode when checking whether a folio belongs to\nthe node inode, leading to a panic.\n\nThis patch fixes the issue by calling f2fs_in_warm_node_list() before\ndecrementing sbi->nr_pages[F2FS_WB_CP_DATA], thus preventing the\nuse-after-free condition.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "50fa53eccf9f911a5b435248a2b0bd484fd82e5e",
              "status": "affected",
              "versionType": "git",
              "lessThan": "7dbdab4430e4654db9aacef12b9b3b8b29ca25cb"
            },
            {
              "version": "50fa53eccf9f911a5b435248a2b0bd484fd82e5e",
              "status": "affected",
              "versionType": "git",
              "lessThan": "ffb94770dbdfb5411be5d9f44a960b010ec890ad"
            },
            {
              "version": "50fa53eccf9f911a5b435248a2b0bd484fd82e5e",
              "status": "affected",
              "versionType": "git",
              "lessThan": "0d40b26377f891e6dcb6efaf8ef9374c99be1b1d"
            },
            {
              "version": "50fa53eccf9f911a5b435248a2b0bd484fd82e5e",
              "status": "affected",
              "versionType": "git",
              "lessThan": "1171f329cf1c175321251ac40fd126150d7ad1e8"
            },
            {
              "version": "50fa53eccf9f911a5b435248a2b0bd484fd82e5e",
              "status": "affected",
              "versionType": "git",
              "lessThan": "7be222de96c0f9eee6e65eeb017ef855ee185cfa"
            },
            {
              "version": "50fa53eccf9f911a5b435248a2b0bd484fd82e5e",
              "status": "affected",
              "versionType": "git",
              "lessThan": "963d2e24d9d92a31e6773b0f642214f10013ebf7"
            },
            {
              "version": "50fa53eccf9f911a5b435248a2b0bd484fd82e5e",
              "status": "affected",
              "versionType": "git",
              "lessThan": "188bb65f247a7a7c62f287c9a263aee3cad96fa5"
            },
            {
              "version": "50fa53eccf9f911a5b435248a2b0bd484fd82e5e",
              "status": "affected",
              "versionType": "git",
              "lessThan": "2d9c4a4ed4eef1f82c5b16b037aee8bad819fd53"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "4.19",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "4.19"
            },
            {
              "version": "5.10.259",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.15.210",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "6.1.176",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.6.140",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.12.86",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.18.25",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "version": "7.0.2",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "7.0.*"
            },
            {
              "version": "7.1",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}