{
  "cveId": "CVE-2025-40244",
  "url": "https://patchblox.com/security/cve/CVE-2025-40244",
  "summary": "CVE-2025-40244 is fixed in 19 products on 1 platform, first by DEBIAN-CVE-2025-40244, released December 4, 2025. It is not reported as exploited. Patch Radar priority: Urgent.",
  "title": "hfsplus: fix KMSAN uninit-value issue in __hfsplus_ext_cache_extent()",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  hfsplus: fix KMSAN uninit-value issue in __hfsplus_ext_cache_extent()  The syzbot reported issue in __hfsplus_ext_cache_extent():  [   70.194323][ T9350] BUG: KMSAN: uninit-value in __hfsplus_ext_cache_extent\u002B0x7d0/0x990 [   70.195022][ T9350]  __hfsplus_ext_cache_extent\u002B0x7d0/0x990 [   70.195530][ T9350]  hfsplus_file_extend\u002B0x74f/0x1cf0 [   70.195998][ T9350]  hfsplus_get_block\u002B0xe16/0x17b0 [   70.196458][ T9350]  __block_write_begin_int\u002B0x962/0x2ce0 [   70.196959][ T9350]  cont_write_begin\u002B0x1000/0x1950 [   70.197416][ T9350]  hfsplus_write_begin\u002B0x85/0x130 [   70.197873][ T9350]  generic_perform_write\u002B0x3e8/0x1060 [   70.198374][ T9350]  __generic_file_write_iter\u002B0x215/0x460 [   70.198892][ T9350]  generic_file_write_iter\u002B0x109/0x5e0 [   70.199393][ T9350]  vfs_write\u002B0xb0f/0x14e0 [   70.199771][ T9350]  ksys_write\u002B0x23e/0x490 [   70.200149][ T9350]  __x64_sys_write\u002B0x97/0xf0 [   70.200570][ T9350]  x64_sys_call\u002B0x3015/0x3cf0 [   70.201065][ T9350]  do_syscall_64\u002B0xd9/0x1d0 [   70.201506][ T9350]  entry_SYSCALL_64_after_hwframe\u002B0x77/0x7f [   70.202054][ T9350] [   70.202279][ T9350] Uninit was created at: [   70.202693][ T9350]  __kmalloc_noprof\u002B0x621/0xf80 [   70.203149][ T9350]  hfsplus_find_init\u002B0x8d/0x1d0 [   70.203602][ T9350]  hfsplus_file_extend\u002B0x6ca/0x1cf0 [   70.204087][ T9350]  hfsplus_get_block\u002B0xe16/0x17b0 [   70.204561][ T9350]  __block_write_begin_int\u002B0x962/0x2ce0 [   70.205074][ T9350]  cont_write_begin\u002B0x1000/0x1950 [   70.205547][ T9350]  hfsplus_write_begin\u002B0x85/0x130 [   70.206017][ T9350]  generic_perform_write\u002B0x3e8/0x1060 [   70.206519][ T9350]  __generic_file_write_iter\u002B0x215/0x460 [   70.207042][ T9350]  generic_file_write_iter\u002B0x109/0x5e0 [   70.207552][ T9350]  vfs_write\u002B0xb0f/0x14e0 [   70.207961][ T9350]  ksys_write\u002B0x23e/0x490 [   70.208375][ T9350]  __x64_sys_write\u002B0x97/0xf0 [   70.208810][ T9350]  x64_sys_call\u002B0x3015/0x3cf0 [   70.209255][ T9350]  do_syscall_64\u002B0xd9/0x1d0 [   70.209680][ T9350]  entry_SYSCALL_64_after_hwframe\u002B0x77/0x7f [   70.210230][ T9350] [   70.210454][ T9350] CPU: 2 UID: 0 PID: 9350 Comm: repro Not tainted 6.12.0-rc5 #5 [   70.211174][ T9350] Hardware name: QEMU Ubuntu 24.04 PC (i440FX \u002B PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [   70.212115][ T9350] ===================================================== [   70.212734][ T9350] Disabling lock debugging due to kernel taint [   70.213284][ T9350] Kernel panic - not syncing: kmsan.panic set ... [   70.213858][ T9350] CPU: 2 UID: 0 PID: 9350 Comm: repro Tainted: G    B              6.12.0-rc5 #5 [   70.214679][ T9350] Tainted: [B]=BAD_PAGE [   70.215057][ T9350] Hardware name: QEMU Ubuntu 24.04 PC (i440FX \u002B PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [   70.215999][ T9350] Call Trace: [   70.216309][ T9350]  \u003CTASK\u003E [   70.216585][ T9350]  dump_stack_lvl\u002B0x1fd/0x2b0 [   70.217025][ T9350]  dump_stack\u002B0x1e/0x30 [   70.217421][ T9350]  panic\u002B0x502/0xca0 [   70.217803][ T9350]  ? kmsan_get_metadata\u002B0x13e/0x1c0  [   70.218294][ Message fromT sy9350]  kmsan_report\u002B0x296/slogd@syzkaller 0x2aat Aug 18 22:11:058 ...  kernel :[   70.213284][ T9350] Kernel panic - not syncing: kmsan.panic [   70.220179][ T9350]  ? kmsan_get_metadata\u002B0x13e/0x1c0 set ... [   70.221254][ T9350]  ? __msan_warning\u002B0x96/0x120 [   70.222066][ T9350]  ? __hfsplus_ext_cache_extent\u002B0x7d0/0x990 [   70.223023][ T9350]  ? hfsplus_file_extend\u002B0x74f/0x1cf0 [   70.224120][ T9350]  ? hfsplus_get_block\u002B0xe16/0x17b0 [   70.224946][ T9350]  ? __block_write_begin_int\u002B0x962/0x2ce0 [   70.225756][ T9350]  ? cont_write_begin\u002B0x1000/0x1950 [   70.226337][ T9350]  ? hfsplus_write_begin\u002B0x85/0x130 [   70.226852][ T9350]  ? generic_perform_write\u002B0x3e8/0x1060 [   70.227405][ T9350]  ? __generic_file_write_iter\u002B0x215/0x460 [   70.227979][ T9350]  ? generic_file_write_iter\u002B0x109/0x5e0 [   70.228540][ T9350]  ? vfs_write\u002B0xb0f/0x14e0 [   70.228997][ T9350]  ? ksys_write\u002B0x23e/0x490 ---truncated---",
  "published": "2025-12-04T16:16:17Z",
  "severity": "Critical",
  "cvss": 9.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00164,
  "epssPercentile": 0.0569,
  "priority": "Urgent",
  "priorityTier": 2,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-40244",
  "fixes": [
    {
      "platform": "linux",
      "product": "dtb-aarch64",
      "release": "opensuse-leap 15.6",
      "fixedVersion": "6.4.0-150600.23.84.1",
      "fix": "SUSE-SU-2026:0293-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-0293-1",
      "released": "2026-01-26T11:36:42Z"
    },
    {
      "platform": "linux",
      "product": "kernel-64kb",
      "release": "opensuse-leap 15.6",
      "fixedVersion": "6.4.0-150600.23.84.1",
      "fix": "SUSE-SU-2026:0293-1",
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      "released": "2026-01-26T11:36:42Z"
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    {
      "platform": "linux",
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      "fix": "SUSE-SU-2026:0315-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-0315-1",
      "released": "2026-01-28T14:34:30Z"
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    {
      "platform": "linux",
      "product": "kernel-azure",
      "release": "sles 15.7",
      "fixedVersion": "6.4.0-150700.20.24.1",
      "fix": "SUSE-SU-2026:0281-1",
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      "released": "2026-01-23T16:03:47Z"
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    {
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      "product": "kernel-debug",
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  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}