{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "10995aa2451afa20b721cc7de856cae1a13dba57"
            },
            {
              "fixed": "7eafcf507fbd68f3276c00f6c02ef155ad69f79b"
            },
            {
              "fixed": "fabfa6b81bd386154d7e59f8cd8f760f9e68b48c"
            },
            {
              "fixed": "b328d8e7c437d0f026ba2c13788af6eae77700f1"
            },
            {
              "fixed": "6575f9fbf084502b7118a628425bf7866666498d"
            },
            {
              "fixed": "911b557dd7817460881fd51a03069b539c674d0e"
            },
            {
              "fixed": "e384a850a3370d89a7a446cdeccd964bfba2a302"
            },
            {
              "fixed": "10fb72c47aac446f12a4ccd962c7daa60cc890a1"
            },
            {
              "fixed": "41c6e9bc3a09539deab43957a3211d902a4818f0"
            },
            {
              "fixed": "4a1c0ddc6e7bcf2e9db0eeaab9340dcfe97f448f"
            }
          ],
          "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": "5.10.258"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.209"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.175"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.136"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.83"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.24"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "6.19.14"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.20.0"
            },
            {
              "fixed": "7.0.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31596.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: handle invalid dinode in ocfs2_group_extend\n\n[BUG]\nkernel BUG at fs/ocfs2/resize.c:308!\nOops: invalid opcode: 0000 [#1] SMP KASAN NOPTI\nRIP: 0010:ocfs2_group_extend+0x10aa/0x1ae0 fs/ocfs2/resize.c:308\nCode: 8b8520ff ffff83f8 860f8580 030000e8 5cc3c1fe\nCall Trace:\n ...\n ocfs2_ioctl+0x175/0x6e0 fs/ocfs2/ioctl.c:869\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:597 [inline]\n __se_sys_ioctl fs/ioctl.c:583 [inline]\n __x64_sys_ioctl+0x197/0x1e0 fs/ioctl.c:583\n x64_sys_call+0x1144/0x26a0 arch/x86/include/generated/asm/syscalls_64.h:17\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0x93/0xf80 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n ...\n\n[CAUSE]\nocfs2_group_extend() assumes that the global bitmap inode block\nreturned from ocfs2_inode_lock() has already been validated and\nBUG_ONs when the signature is not a dinode. That assumption is too\nstrong for crafted filesystems because the JBD2-managed buffer path\ncan bypass structural validation and return an invalid dinode to the\nresize ioctl.\n\n[FIX]\nValidate the dinode explicitly in ocfs2_group_extend(). If the global\nbitmap buffer does not contain a valid dinode, report filesystem\ncorruption with ocfs2_error() and fail the resize operation instead of\ncrashing the kernel.",
  "id": "CVE-2026-31596",
  "modified": "2026-07-15T01:49:10.189972200Z",
  "published": "2026-04-24T14:42:22.003Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/10fb72c47aac446f12a4ccd962c7daa60cc890a1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/41c6e9bc3a09539deab43957a3211d902a4818f0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4a1c0ddc6e7bcf2e9db0eeaab9340dcfe97f448f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6575f9fbf084502b7118a628425bf7866666498d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7eafcf507fbd68f3276c00f6c02ef155ad69f79b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/911b557dd7817460881fd51a03069b539c674d0e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b328d8e7c437d0f026ba2c13788af6eae77700f1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e384a850a3370d89a7a446cdeccd964bfba2a302"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fabfa6b81bd386154d7e59f8cd8f760f9e68b48c"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31596.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31596"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "summary": "ocfs2: handle invalid dinode in ocfs2_group_extend"
}