{
  "cveId": "CVE-2025-40265",
  "url": "https://patchblox.com/security/cve/CVE-2025-40265",
  "summary": "CVE-2025-40265 is fixed in linux on 1 platform by DEBIAN-CVE-2025-40265 (version 6.17.10-1), released December 4, 2025. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  vfat: fix missing sb_min_blocksize() return valu...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  vfat: fix missing sb_min_blocksize() return value checks  When emulating an nvme device on qemu with both logical_block_size and physical_block_size set to 8 KiB, but without format, a kernel panic was triggered during the early boot stage while attempting to mount a vfat filesystem.  [95553.682035] EXT4-fs (nvme0n1): unable to set blocksize [95553.684326] EXT4-fs (nvme0n1): unable to set blocksize [95553.686501] EXT4-fs (nvme0n1): unable to set blocksize [95553.696448] ISOFS: unsupported/invalid hardware sector size 8192 [95553.697117] ------------[ cut here ]------------ [95553.697567] kernel BUG at fs/buffer.c:1582! [95553.697984] Oops: invalid opcode: 0000 [#1] SMP NOPTI [95553.698602] CPU: 0 UID: 0 PID: 7212 Comm: mount Kdump: loaded Not tainted 6.18.0-rc2\u002B #38 PREEMPT(voluntary) [95553.699511] Hardware name: QEMU Standard PC (i440FX \u002B PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [95553.700534] RIP: 0010:folio_alloc_buffers\u002B0x1bb/0x1c0 [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 \u003C0f\u003E 0b 90 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f [95553.702648] RSP: 0018:ffffd1b0c676f990 EFLAGS: 00010246 [95553.703132] RAX: ffff8cfc4176d820 RBX: 0000000000508c48 RCX: 0000000000000001 [95553.703805] RDX: 0000000000002000 RSI: 0000000000000000 RDI: 0000000000000000 [95553.704481] RBP: ffffd1b0c676f9c8 R08: 0000000000000000 R09: 0000000000000000 [95553.705148] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001 [95553.705816] R13: 0000000000002000 R14: fffff8bc8257e800 R15: 0000000000000000 [95553.706483] FS:  000072ee77315840(0000) GS:ffff8cfdd2c8d000(0000) knlGS:0000000000000000 [95553.707248] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [95553.707782] CR2: 00007d8f2a9e5a20 CR3: 0000000039d0c006 CR4: 0000000000772ef0 [95553.708439] PKRU: 55555554 [95553.708734] Call Trace: [95553.709015]  \u003CTASK\u003E [95553.709266]  __getblk_slow\u002B0xd2/0x230 [95553.709641]  ? find_get_block_common\u002B0x8b/0x530 [95553.710084]  bdev_getblk\u002B0x77/0xa0 [95553.710449]  __bread_gfp\u002B0x22/0x140 [95553.710810]  fat_fill_super\u002B0x23a/0xfc0 [95553.711216]  ? __pfx_setup\u002B0x10/0x10 [95553.711580]  ? __pfx_vfat_fill_super\u002B0x10/0x10 [95553.712014]  vfat_fill_super\u002B0x15/0x30 [95553.712401]  get_tree_bdev_flags\u002B0x141/0x1e0 [95553.712817]  get_tree_bdev\u002B0x10/0x20 [95553.713177]  vfat_get_tree\u002B0x15/0x20 [95553.713550]  vfs_get_tree\u002B0x2a/0x100 [95553.713910]  vfs_cmd_create\u002B0x62/0xf0 [95553.714273]  __do_sys_fsconfig\u002B0x4e7/0x660 [95553.714669]  __x64_sys_fsconfig\u002B0x20/0x40 [95553.715062]  x64_sys_call\u002B0x21ee/0x26a0 [95553.715453]  do_syscall_64\u002B0x80/0x670 [95553.715816]  ? __fs_parse\u002B0x65/0x1e0 [95553.716172]  ? fat_parse_param\u002B0x103/0x4b0 [95553.716587]  ? vfs_parse_fs_param_source\u002B0x21/0xa0 [95553.717034]  ? __do_sys_fsconfig\u002B0x3d9/0x660 [95553.717548]  ? __x64_sys_fsconfig\u002B0x20/0x40 [95553.717957]  ? x64_sys_call\u002B0x21ee/0x26a0 [95553.718360]  ? do_syscall_64\u002B0xb8/0x670 [95553.718734]  ? __x64_sys_fsconfig\u002B0x20/0x40 [95553.719141]  ? x64_sys_call\u002B0x21ee/0x26a0 [95553.719545]  ? do_syscall_64\u002B0xb8/0x670 [95553.719922]  ? x64_sys_call\u002B0x1405/0x26a0 [95553.720317]  ? do_syscall_64\u002B0xb8/0x670 [95553.720702]  ? __x64_sys_close\u002B0x3e/0x90 [95553.721080]  ? x64_sys_call\u002B0x1b5e/0x26a0 [95553.721478]  ? do_syscall_64\u002B0xb8/0x670 [95553.721841]  ? irqentry_exit\u002B0x43/0x50 [95553.722211]  ? exc_page_fault\u002B0x90/0x1b0 [95553.722681]  entry_SYSCALL_64_after_hwframe\u002B0x76/0x7e [95553.723166] RIP: 0033:0x72ee774f3afe [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 \u003C48\u003E 3d 01 f0 ff ff 73 01 c3 48 8b 0d da 32 0f 00 f7 d8 64 89 01 48 [95553.725188] RSP: 002b:00007ffe97148978 EFLAGS: 00000246 ORIG_RAX: 00000000000001af [95553.725892] RAX: ffffffffffffffda RBX:  ---truncated---",
  "published": "2025-12-04T16:16:20Z",
  "severity": "",
  "epss": 0.00205,
  "epssPercentile": 0.10513,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.17.10-1",
      "fix": "DEBIAN-CVE-2025-40265",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-40265",
      "released": "2025-12-04T16:16:20Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T19:12:23Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}