{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "6866d7b3f2bb4f011041ba54c98b1584497fe2fd"
            },
            {
              "fixed": "aa90f00932bf572d6ef284c977c2a60b39c13bd6"
            },
            {
              "fixed": "e144ad0250f77e23e28949587b8b57e40dc3b512"
            },
            {
              "fixed": "4b48dcb88bb9117e3d3f051175a9a8b7cff7f8b6"
            },
            {
              "fixed": "fb9b49618ed7296ebfad62a3835da8945f727001"
            },
            {
              "fixed": "4450dcaadf7d4aae8b6e4223b5d6ee4eb77097a9"
            },
            {
              "fixed": "78955fdce8ff654e6d33a2fa90882a1e7eb26330"
            },
            {
              "fixed": "a58fc10adf503969fec2007b5afe8987258046c4"
            },
            {
              "fixed": "289a2ca0c9b7eae74f93fc213b0b971669b8683d"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.10.0"
            },
            {
              "fixed": "5.10.266"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.212"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.178"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.145"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.97"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.40"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72225.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\njbd2: fix integer underflow in jbd2_journal_initialize_fast_commit()\n\njbd2_journal_initialize_fast_commit() validates journal capacity by\nchecking (journal-\u003ej_last - num_fc_blks \u003c JBD2_MIN_JOURNAL_BLOCKS).\nBoth j_last and num_fc_blks are unsigned, so when num_fc_blks exceeds\nj_last the subtraction wraps to a large value, bypassing the bounds\ncheck.\n\nThe resulting underflow corrupts j_last, j_fc_first, and j_free,\nleading to journal abort.\n\nFix by checking num_fc_blks against j_last before the subtraction,\nreturning -EFSCORRUPTED.",
  "id": "CVE-2026-72225",
  "modified": "2026-08-25T03:51:27.629255052Z",
  "published": "2026-08-15T05:54:17.541Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/289a2ca0c9b7eae74f93fc213b0b971669b8683d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4450dcaadf7d4aae8b6e4223b5d6ee4eb77097a9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4b48dcb88bb9117e3d3f051175a9a8b7cff7f8b6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/78955fdce8ff654e6d33a2fa90882a1e7eb26330"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a58fc10adf503969fec2007b5afe8987258046c4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/aa90f00932bf572d6ef284c977c2a60b39c13bd6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e144ad0250f77e23e28949587b8b57e40dc3b512"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fb9b49618ed7296ebfad62a3835da8945f727001"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72225.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72225"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "jbd2: fix integer underflow in jbd2_journal_initialize_fast_commit()"
}