{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "10995aa2451afa20b721cc7de856cae1a13dba57"
            },
            {
              "fixed": "bf1d59cf2ac8a1730607ebaa0bc0dc6d00f197d0"
            },
            {
              "fixed": "86509c5296fe46ad6bcdd83931a53c2c6b7913a8"
            },
            {
              "fixed": "12c32a7350b670aaaaf2e01583d8648ec0c9755c"
            },
            {
              "fixed": "b460f8d01a12061853d02c8fb693fb42450acd7d"
            },
            {
              "fixed": "a06eec15596e5801bad59ad16cd2bf4f0fa839a1"
            },
            {
              "fixed": "3852478d34c7baa490ba9c7374ee901a56eea577"
            },
            {
              "fixed": "5b33f99f3e48465bd93219495381a5aef4fa967f"
            },
            {
              "fixed": "c0438198c28b1d22c272751af5e717c11d9fa8dd"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.29"
            },
            {
              "fixed": "5.10.261"
            }
          ],
          "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/2026/80xxx/CVE-2026-80644.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: don't BUG_ON an invalid journal dinode\n\n[BUG]\nA fuzzed OCFS2 image can corrupt the current slot journal dinode while\nmount is still in progress. The mount path first reports the invalid\njournal block and then crashes in shutdown:\n\nkernel BUG at fs/ocfs2/journal.c:1034!\nOops: invalid opcode: 0000 [#1] SMP KASAN NOPTI\nRIP: 0010:ocfs2_journal_toggle_dirty+0x2d6/0x340 fs/ocfs2/journal.c:1034\nCall Trace:\n ocfs2_journal_shutdown+0x414/0xc30 fs/ocfs2/journal.c:1116\n ocfs2_mount_volume fs/ocfs2/super.c:1785 [inline]\n ocfs2_fill_super+0x30a9/0x3cd0 fs/ocfs2/super.c:1083\n get_tree_bdev_flags+0x38b/0x640 fs/super.c:1698\n get_tree_bdev+0x24/0x40 fs/super.c:1721\n ocfs2_get_tree+0x21/0x30 fs/ocfs2/super.c:1184\n vfs_get_tree+0x9a/0x370 fs/super.c:1758\n fc_mount fs/namespace.c:1199 [inline]\n do_new_mount_fc fs/namespace.c:3642 [inline]\n do_new_mount fs/namespace.c:3718 [inline]\n path_mount+0x5b8/0x1ea0 fs/namespace.c:4028\n do_mount fs/namespace.c:4041 [inline]\n __do_sys_mount fs/namespace.c:4229 [inline]\n __se_sys_mount fs/namespace.c:4206 [inline]\n __x64_sys_mount+0x282/0x320 fs/namespace.c:4206\n ...\n\n[CAUSE]\nocfs2_journal_toggle_dirty() used to return -EIO when journal-\u003ej_bh no\nlonger contained a valid dinode, because the startup and shutdown paths\nalready handled that failure. Commit 10995aa2451a\n(\"ocfs2: Morph the haphazard OCFS2_IS_VALID_DINODE() checks.\") changed\nthe check to a BUG_ON() under the assumption that the journal dinode had\nalready been validated. That turns an unexpected invalid journal dinode\nduring mount teardown into a kernel crash instead of a normal mount\nfailure.\n\n[FIX]\nReplace the BUG_ON() with WARN_ON() and return -EIO. This keeps the\ninvariant warning for debugging, but restores the original behavior of\nfailing startup or shutdown cleanly instead of panicking the kernel.",
  "id": "CVE-2026-80644",
  "modified": "2026-08-30T03:30:29.131255953Z",
  "published": "2026-08-28T06:48:55.076Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/12c32a7350b670aaaaf2e01583d8648ec0c9755c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3852478d34c7baa490ba9c7374ee901a56eea577"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5b33f99f3e48465bd93219495381a5aef4fa967f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/86509c5296fe46ad6bcdd83931a53c2c6b7913a8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a06eec15596e5801bad59ad16cd2bf4f0fa839a1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b460f8d01a12061853d02c8fb693fb42450acd7d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bf1d59cf2ac8a1730607ebaa0bc0dc6d00f197d0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c0438198c28b1d22c272751af5e717c11d9fa8dd"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80644.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80644"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "ocfs2: don't BUG_ON an invalid journal dinode"
}