{
  "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-2025-40265",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2025-40265",
    "idYear": 2025,
    "status": "PUBLISHED",
    "publishedAt": "2025-12-04T16:08:24.708Z",
    "updatedAt": "2026-05-11T21:45:59.821Z",
    "importedAt": "2026-10-24T01:57:34.152Z",
    "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": "vfat: fix missing sb_min_blocksize() return value checks",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nvfat: fix missing sb_min_blocksize() return value checks\n\nWhen emulating an nvme device on qemu with both logical_block_size and\nphysical_block_size set to 8 KiB, but without format, a kernel panic\nwas triggered during the early boot stage while attempting to mount a\nvfat filesystem.\n\n[95553.682035] EXT4-fs (nvme0n1): unable to set blocksize\n[95553.684326] EXT4-fs (nvme0n1): unable to set blocksize\n[95553.686501] EXT4-fs (nvme0n1): unable to set blocksize\n[95553.696448] ISOFS: unsupported/invalid hardware sector size 8192\n[95553.697117] ------------[ cut here ]------------\n[95553.697567] kernel BUG at fs/buffer.c:1582!\n[95553.697984] Oops: invalid opcode: 0000 [#1] SMP NOPTI\n[95553.698602] CPU: 0 UID: 0 PID: 7212 Comm: mount Kdump: loaded Not tainted 6.18.0-rc2+ #38 PREEMPT(voluntary)\n[95553.699511] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014\n[95553.700534] RIP: 0010:folio_alloc_buffers+0x1bb/0x1c0\n[95553.701018] Code: 48 8b 15 e8 93 18 02 65 48 89 35 e0 93 18 02 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f 5d 31 d2 31 c9 31 f6 31 ff c3 cc cc cc cc <0f> 0b 90 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f\n[95553.702648] RSP: 0018:ffffd1b0c676f990 EFLAGS: 00010246\n[95553.703132] RAX: ffff8cfc4176d820 RBX: 0000000000508c48 RCX: 0000000000000001\n[95553.703805] RDX: 0000000000002000 RSI: 0000000000000000 RDI: 0000000000000000\n[95553.704481] RBP: ffffd1b0c676f9c8 R08: 0000000000000000 R09: 0000000000000000\n[95553.705148] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001\n[95553.705816] R13: 0000000000002000 R14: fffff8bc8257e800 R15: 0000000000000000\n[95553.706483] FS:  000072ee77315840(0000) GS:ffff8cfdd2c8d000(0000) knlGS:0000000000000000\n[95553.707248] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[95553.707782] CR2: 00007d8f2a9e5a20 CR3: 0000000039d0c006 CR4: 0000000000772ef0\n[95553.708439] PKRU: 55555554\n[95553.708734] Call Trace:\n[95553.709015]  <TASK>\n[95553.709266]  __getblk_slow+0xd2/0x230\n[95553.709641]  ? find_get_block_common+0x8b/0x530\n[95553.710084]  bdev_getblk+0x77/0xa0\n[95553.710449]  __bread_gfp+0x22/0x140\n[95553.710810]  fat_fill_super+0x23a/0xfc0\n[95553.711216]  ? __pfx_setup+0x10/0x10\n[95553.711580]  ? __pfx_vfat_fill_super+0x10/0x10\n[95553.712014]  vfat_fill_super+0x15/0x30\n[95553.712401]  get_tree_bdev_flags+0x141/0x1e0\n[95553.712817]  get_tree_bdev+0x10/0x20\n[95553.713177]  vfat_get_tree+0x15/0x20\n[95553.713550]  vfs_get_tree+0x2a/0x100\n[95553.713910]  vfs_cmd_create+0x62/0xf0\n[95553.714273]  __do_sys_fsconfig+0x4e7/0x660\n[95553.714669]  __x64_sys_fsconfig+0x20/0x40\n[95553.715062]  x64_sys_call+0x21ee/0x26a0\n[95553.715453]  do_syscall_64+0x80/0x670\n[95553.715816]  ? __fs_parse+0x65/0x1e0\n[95553.716172]  ? fat_parse_param+0x103/0x4b0\n[95553.716587]  ? vfs_parse_fs_param_source+0x21/0xa0\n[95553.717034]  ? __do_sys_fsconfig+0x3d9/0x660\n[95553.717548]  ? __x64_sys_fsconfig+0x20/0x40\n[95553.717957]  ? x64_sys_call+0x21ee/0x26a0\n[95553.718360]  ? do_syscall_64+0xb8/0x670\n[95553.718734]  ? __x64_sys_fsconfig+0x20/0x40\n[95553.719141]  ? x64_sys_call+0x21ee/0x26a0\n[95553.719545]  ? do_syscall_64+0xb8/0x670\n[95553.719922]  ? x64_sys_call+0x1405/0x26a0\n[95553.720317]  ? do_syscall_64+0xb8/0x670\n[95553.720702]  ? __x64_sys_close+0x3e/0x90\n[95553.721080]  ? x64_sys_call+0x1b5e/0x26a0\n[95553.721478]  ? do_syscall_64+0xb8/0x670\n[95553.721841]  ? irqentry_exit+0x43/0x50\n[95553.722211]  ? exc_page_fault+0x90/0x1b0\n[95553.722681]  entry_SYSCALL_64_after_hwframe+0x76/0x7e\n[95553.723166] RIP: 0033:0x72ee774f3afe\n[95553.723562] Code: 73 01 c3 48 8b 0d 0a 33 0f 00 f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 49 89 ca b8 af 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d da 32 0f 00 f7 d8 64 89 01 48\n[95553.725188] RSP: 002b:00007ffe97148978 EFLAGS: 00000246 ORIG_RAX: 00000000000001af\n[95553.725892] RAX: ffffffffffffffda RBX: \n---truncated---",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "a64e5a596067bddba87fcc2ce37e56c3fca831b7",
              "status": "affected",
              "versionType": "git",
              "lessThan": "ee767b99b0045be286cceb8265bd4c9831be671e"
            },
            {
              "version": "a64e5a596067bddba87fcc2ce37e56c3fca831b7",
              "status": "affected",
              "versionType": "git",
              "lessThan": "63b5aa01da0f38cdbd97d021477258e511631497"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "6.15",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "6.15"
            },
            {
              "version": "6.17.10",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.17.*"
            },
            {
              "version": "6.18",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}