CVE-2025-40244 (GCVE-0-2025-40244)

Vulnerability from cvelistv5 – Published: 2025-12-04 15:31 – Updated: 2026-08-05 12:08
VLAI
Title
hfsplus: fix KMSAN uninit-value issue in __hfsplus_ext_cache_extent()
Summary
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+0x7d0/0x990 [ 70.195022][ T9350] __hfsplus_ext_cache_extent+0x7d0/0x990 [ 70.195530][ T9350] hfsplus_file_extend+0x74f/0x1cf0 [ 70.195998][ T9350] hfsplus_get_block+0xe16/0x17b0 [ 70.196458][ T9350] __block_write_begin_int+0x962/0x2ce0 [ 70.196959][ T9350] cont_write_begin+0x1000/0x1950 [ 70.197416][ T9350] hfsplus_write_begin+0x85/0x130 [ 70.197873][ T9350] generic_perform_write+0x3e8/0x1060 [ 70.198374][ T9350] __generic_file_write_iter+0x215/0x460 [ 70.198892][ T9350] generic_file_write_iter+0x109/0x5e0 [ 70.199393][ T9350] vfs_write+0xb0f/0x14e0 [ 70.199771][ T9350] ksys_write+0x23e/0x490 [ 70.200149][ T9350] __x64_sys_write+0x97/0xf0 [ 70.200570][ T9350] x64_sys_call+0x3015/0x3cf0 [ 70.201065][ T9350] do_syscall_64+0xd9/0x1d0 [ 70.201506][ T9350] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 70.202054][ T9350] [ 70.202279][ T9350] Uninit was created at: [ 70.202693][ T9350] __kmalloc_noprof+0x621/0xf80 [ 70.203149][ T9350] hfsplus_find_init+0x8d/0x1d0 [ 70.203602][ T9350] hfsplus_file_extend+0x6ca/0x1cf0 [ 70.204087][ T9350] hfsplus_get_block+0xe16/0x17b0 [ 70.204561][ T9350] __block_write_begin_int+0x962/0x2ce0 [ 70.205074][ T9350] cont_write_begin+0x1000/0x1950 [ 70.205547][ T9350] hfsplus_write_begin+0x85/0x130 [ 70.206017][ T9350] generic_perform_write+0x3e8/0x1060 [ 70.206519][ T9350] __generic_file_write_iter+0x215/0x460 [ 70.207042][ T9350] generic_file_write_iter+0x109/0x5e0 [ 70.207552][ T9350] vfs_write+0xb0f/0x14e0 [ 70.207961][ T9350] ksys_write+0x23e/0x490 [ 70.208375][ T9350] __x64_sys_write+0x97/0xf0 [ 70.208810][ T9350] x64_sys_call+0x3015/0x3cf0 [ 70.209255][ T9350] do_syscall_64+0xd9/0x1d0 [ 70.209680][ T9350] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 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 + 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 + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 70.215999][ T9350] Call Trace: [ 70.216309][ T9350] <TASK> [ 70.216585][ T9350] dump_stack_lvl+0x1fd/0x2b0 [ 70.217025][ T9350] dump_stack+0x1e/0x30 [ 70.217421][ T9350] panic+0x502/0xca0 [ 70.217803][ T9350] ? kmsan_get_metadata+0x13e/0x1c0 [ 70.218294][ Message fromT sy9350] kmsan_report+0x296/slogd@syzkaller 0x2aat Aug 18 22:11:058 ... kernel :[ 70.213284][ T9350] Kernel panic - not syncing: kmsan.panic [ 70.220179][ T9350] ? kmsan_get_metadata+0x13e/0x1c0 set ... [ 70.221254][ T9350] ? __msan_warning+0x96/0x120 [ 70.222066][ T9350] ? __hfsplus_ext_cache_extent+0x7d0/0x990 [ 70.223023][ T9350] ? hfsplus_file_extend+0x74f/0x1cf0 [ 70.224120][ T9350] ? hfsplus_get_block+0xe16/0x17b0 [ 70.224946][ T9350] ? __block_write_begin_int+0x962/0x2ce0 [ 70.225756][ T9350] ? cont_write_begin+0x1000/0x1950 [ 70.226337][ T9350] ? hfsplus_write_begin+0x85/0x130 [ 70.226852][ T9350] ? generic_perform_write+0x3e8/0x1060 [ 70.227405][ T9350] ? __generic_file_write_iter+0x215/0x460 [ 70.227979][ T9350] ? generic_file_write_iter+0x109/0x5e0 [ 70.228540][ T9350] ? vfs_write+0xb0f/0x14e0 [ 70.228997][ T9350] ? ksys_write+0x23e/0x490 ---truncated---
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < c1ec90bed504640a42bb20a5f413be39cd17ad71 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < b8a72692aa42b7dcd179a96b90bc2763ac74576a (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < c135b8dca65526aa5b8814e9954e0ae317d9c598 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < d7e313039a8f3a6ee072dc5ff4643234d2d735cf (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < a5bfb13b4f406aef1a450f99d22d3e48df01528c (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 99202d94909d323a30d154ab0261c0a07166daec (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 14c673a2f3ecf650b694a52a88688f1d71849899 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 4840ceadef4290c56cc422f0fc697655f3cbf070 (git)
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Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 5.4.301 , ≤ 5.4.* (semver)
Unaffected: 5.10.246 , ≤ 5.10.* (semver)
Unaffected: 5.15.196 , ≤ 5.15.* (semver)
Unaffected: 6.1.158 , ≤ 6.1.* (semver)
Unaffected: 6.6.115 , ≤ 6.6.* (semver)
Unaffected: 6.12.56 , ≤ 6.12.* (semver)
Unaffected: 6.17.6 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
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{
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              "status": "unaffected",
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              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
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              "versionType": "semver"
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              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
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              "versionType": "semver"
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              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
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              "versionType": "semver"
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              "versionType": "semver"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhfsplus: fix KMSAN uninit-value issue in __hfsplus_ext_cache_extent()\n\nThe syzbot reported issue in __hfsplus_ext_cache_extent():\n\n[   70.194323][ T9350] BUG: KMSAN: uninit-value in __hfsplus_ext_cache_extent+0x7d0/0x990\n[   70.195022][ T9350]  __hfsplus_ext_cache_extent+0x7d0/0x990\n[   70.195530][ T9350]  hfsplus_file_extend+0x74f/0x1cf0\n[   70.195998][ T9350]  hfsplus_get_block+0xe16/0x17b0\n[   70.196458][ T9350]  __block_write_begin_int+0x962/0x2ce0\n[   70.196959][ T9350]  cont_write_begin+0x1000/0x1950\n[   70.197416][ T9350]  hfsplus_write_begin+0x85/0x130\n[   70.197873][ T9350]  generic_perform_write+0x3e8/0x1060\n[   70.198374][ T9350]  __generic_file_write_iter+0x215/0x460\n[   70.198892][ T9350]  generic_file_write_iter+0x109/0x5e0\n[   70.199393][ T9350]  vfs_write+0xb0f/0x14e0\n[   70.199771][ T9350]  ksys_write+0x23e/0x490\n[   70.200149][ T9350]  __x64_sys_write+0x97/0xf0\n[   70.200570][ T9350]  x64_sys_call+0x3015/0x3cf0\n[   70.201065][ T9350]  do_syscall_64+0xd9/0x1d0\n[   70.201506][ T9350]  entry_SYSCALL_64_after_hwframe+0x77/0x7f\n[   70.202054][ T9350]\n[   70.202279][ T9350] Uninit was created at:\n[   70.202693][ T9350]  __kmalloc_noprof+0x621/0xf80\n[   70.203149][ T9350]  hfsplus_find_init+0x8d/0x1d0\n[   70.203602][ T9350]  hfsplus_file_extend+0x6ca/0x1cf0\n[   70.204087][ T9350]  hfsplus_get_block+0xe16/0x17b0\n[   70.204561][ T9350]  __block_write_begin_int+0x962/0x2ce0\n[   70.205074][ T9350]  cont_write_begin+0x1000/0x1950\n[   70.205547][ T9350]  hfsplus_write_begin+0x85/0x130\n[   70.206017][ T9350]  generic_perform_write+0x3e8/0x1060\n[   70.206519][ T9350]  __generic_file_write_iter+0x215/0x460\n[   70.207042][ T9350]  generic_file_write_iter+0x109/0x5e0\n[   70.207552][ T9350]  vfs_write+0xb0f/0x14e0\n[   70.207961][ T9350]  ksys_write+0x23e/0x490\n[   70.208375][ T9350]  __x64_sys_write+0x97/0xf0\n[   70.208810][ T9350]  x64_sys_call+0x3015/0x3cf0\n[   70.209255][ T9350]  do_syscall_64+0xd9/0x1d0\n[   70.209680][ T9350]  entry_SYSCALL_64_after_hwframe+0x77/0x7f\n[   70.210230][ T9350]\n[   70.210454][ T9350] CPU: 2 UID: 0 PID: 9350 Comm: repro Not tainted 6.12.0-rc5 #5\n[   70.211174][ T9350] Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\n[   70.212115][ T9350] =====================================================\n[   70.212734][ T9350] Disabling lock debugging due to kernel taint\n[   70.213284][ T9350] Kernel panic - not syncing: kmsan.panic set ...\n[   70.213858][ T9350] CPU: 2 UID: 0 PID: 9350 Comm: repro Tainted: G    B              6.12.0-rc5 #5\n[   70.214679][ T9350] Tainted: [B]=BAD_PAGE\n[   70.215057][ T9350] Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\n[   70.215999][ T9350] Call Trace:\n[   70.216309][ T9350]  \u003cTASK\u003e\n[   70.216585][ T9350]  dump_stack_lvl+0x1fd/0x2b0\n[   70.217025][ T9350]  dump_stack+0x1e/0x30\n[   70.217421][ T9350]  panic+0x502/0xca0\n[   70.217803][ T9350]  ? kmsan_get_metadata+0x13e/0x1c0\n\n[   70.218294][ Message fromT sy9350]  kmsan_report+0x296/slogd@syzkaller 0x2aat Aug 18 22:11:058 ...\n kernel\n:[   70.213284][ T9350] Kernel panic - not syncing: kmsan.panic [   70.220179][ T9350]  ? kmsan_get_metadata+0x13e/0x1c0\nset ...\n[   70.221254][ T9350]  ? __msan_warning+0x96/0x120\n[   70.222066][ T9350]  ? __hfsplus_ext_cache_extent+0x7d0/0x990\n[   70.223023][ T9350]  ? hfsplus_file_extend+0x74f/0x1cf0\n[   70.224120][ T9350]  ? hfsplus_get_block+0xe16/0x17b0\n[   70.224946][ T9350]  ? __block_write_begin_int+0x962/0x2ce0\n[   70.225756][ T9350]  ? cont_write_begin+0x1000/0x1950\n[   70.226337][ T9350]  ? hfsplus_write_begin+0x85/0x130\n[   70.226852][ T9350]  ? generic_perform_write+0x3e8/0x1060\n[   70.227405][ T9350]  ? __generic_file_write_iter+0x215/0x460\n[   70.227979][ T9350]  ? generic_file_write_iter+0x109/0x5e0\n[   70.228540][ T9350]  ? vfs_write+0xb0f/0x14e0\n[   70.228997][ T9350]  ? ksys_write+0x23e/0x490\n---truncated---"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The defect is only reachable by mounting an attacker-authored HFS+ block device or image locally and then issuing ordinary file syscalls (read/write/unlink) against it; there is no network, adjacent-network, or remote-peer data path into hfsplus_get_block() or hfs_brec_find(). Local mounting of attacker-supplied images is routinely available via udisks2/automount, loop devices, and fstab `user` entries.\nAC:L - Every precondition comes from attacker-authored on-disk metadata: setting vhdr-\u003enext_cnid to 0 deterministically yields inode-\u003ei_ino == 0 so the cnid comparison matches, and an extents b-tree header with root == 0 (or an index node with a zero record offset) deterministically forces the uninitialized-field return path; the residual uninitialized slab/stack values are groomable from userspace with standard techniques and the syzbot reproducer triggers the bug reliably with no race or uncontrollable condition.\nPR:L - hfsplus is registered FS_REQUIRES_DEV without FS_USERNS_MOUNT, so the mount itself needs CAP_SYS_ADMIN in the initial namespace and is not obtainable via unshare -Ur; however, once a privileged automounter such as udisks2 has mounted the removable volume, an ordinary unprivileged local user drives the entire hfsplus_get_block \u2192 hfsplus_file_extend \u2192 __hfsplus_ext_read_extent path with a plain write(), with no capability check anywhere along it.\nUI:N - In the removable-media/udisks2 automount scenario the crafted volume is mounted without any deliberate victim action, and the trigger itself is a normal file read or write performed by the attacker on their own image.\nS:U - The uninitialized-memory consumption, the resulting out-of-bounds page accesses, and any fault all occur inside the host kernel\u0027s own security authority; no VM, hypervisor, IOMMU, or sandbox boundary is crossed.\nC:H - The uninitialized fd-\u003erecord and fd-\u003eentryoffset gate and then feed hfs_bnode_read(bnode, \u0026data, off, 4) in the hfs_brec_find() index-node loop, where the unvalidated offset indexes node-\u003epage[] out of bounds and dereferences arbitrary slab contents as a struct page *, giving an unbounded kernel-memory read; in addition, stale kmalloc\u0027d bytes from fd-\u003ekey seed hip-\u003ecached_start/cached_extents, which are persisted into on-disk metadata the attacker reads back.\nI:H - On the hfsplus_free_fork() path, __hfsplus_ext_read_extent() can return success with uninitialized fields, after which hfs_brec_remove() performs hfs_bnode_write_u16() and hfs_bnode_move() using the garbage fd-\u003erecord, fd-\u003ekeyoffset and fd-\u003ekeylength+fd-\u003eentrylength, producing out-of-bounds writes into kernel page data; garbage extent records additionally steer map_bh() to arbitrary device sectors.\nA:H - On the tree-\u003eroot == 0 path fd-\u003ebnode is NULL, so once the uninitialized entrylength passes the \"!= sizeof(hfsplus_extent_rec)\" check the code dereferences a NULL bnode in hfs_bnode_read(); the reported syzbot outcome is already \"Kernel panic - not syncing\", and a persistent crafted volume retriggers the fault on every access."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:08:48.412Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c1ec90bed504640a42bb20a5f413be39cd17ad71"
        },
        {
          "url": "https://git.kernel.org/stable/c/b8a72692aa42b7dcd179a96b90bc2763ac74576a"
        },
        {
          "url": "https://git.kernel.org/stable/c/c135b8dca65526aa5b8814e9954e0ae317d9c598"
        },
        {
          "url": "https://git.kernel.org/stable/c/d7e313039a8f3a6ee072dc5ff4643234d2d735cf"
        },
        {
          "url": "https://git.kernel.org/stable/c/a5bfb13b4f406aef1a450f99d22d3e48df01528c"
        },
        {
          "url": "https://git.kernel.org/stable/c/99202d94909d323a30d154ab0261c0a07166daec"
        },
        {
          "url": "https://git.kernel.org/stable/c/14c673a2f3ecf650b694a52a88688f1d71849899"
        },
        {
          "url": "https://git.kernel.org/stable/c/4840ceadef4290c56cc422f0fc697655f3cbf070"
        }
      ],
      "title": "hfsplus: fix KMSAN uninit-value issue in __hfsplus_ext_cache_extent()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40244",
    "datePublished": "2025-12-04T15:31:33.249Z",
    "dateReserved": "2025-04-16T07:20:57.181Z",
    "dateUpdated": "2026-08-05T12:08:48.412Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2025-40244",
      "date": "2026-10-01",
      "epss": "0.00155",
      "percentile": "0.03952"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "fs/hfsplus/bfind.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "lessThan": "c1ec90bed504640a42bb20a5f413be39cd17ad71",
                    "status": "affected",
                    "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "b8a72692aa42b7dcd179a96b90bc2763ac74576a",
                    "status": "affected",
                    "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "c135b8dca65526aa5b8814e9954e0ae317d9c598",
                    "status": "affected",
                    "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "d7e313039a8f3a6ee072dc5ff4643234d2d735cf",
                    "status": "affected",
                    "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "a5bfb13b4f406aef1a450f99d22d3e48df01528c",
                    "status": "affected",
                    "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "99202d94909d323a30d154ab0261c0a07166daec",
                    "status": "affected",
                    "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "14c673a2f3ecf650b694a52a88688f1d71849899",
                    "status": "affected",
                    "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "4840ceadef4290c56cc422f0fc697655f3cbf070",
                    "status": "affected",
                    "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                    "versionType": "git"
                  }
                ]
              },
              {
                "defaultStatus": "affected",
                "product": "Linux",
                "programFiles": [
                  "fs/hfsplus/bfind.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "status": "affected",
                    "version": "2.6.12"
                  },
                  {
                    "lessThan": "2.6.12",
                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "5.4.*",
                    "status": "unaffected",
                    "version": "5.4.301",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "5.10.*",
                    "status": "unaffected",
                    "version": "5.10.246",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "5.15.*",
                    "status": "unaffected",
                    "version": "5.15.196",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.1.*",
                    "status": "unaffected",
                    "version": "6.1.158",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.6.*",
                    "status": "unaffected",
                    "version": "6.6.115",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.12.*",
                    "status": "unaffected",
                    "version": "6.12.56",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.17.*",
                    "status": "unaffected",
                    "version": "6.17.6",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "6.18",
                    "versionType": "original_commit_for_fix"
                  }
                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhfsplus: fix KMSAN uninit-value issue in __hfsplus_ext_cache_extent()\n\nThe syzbot reported issue in __hfsplus_ext_cache_extent():\n\n[   70.194323][ T9350] BUG: KMSAN: uninit-value in __hfsplus_ext_cache_extent+0x7d0/0x990\n[   70.195022][ T9350]  __hfsplus_ext_cache_extent+0x7d0/0x990\n[   70.195530][ T9350]  hfsplus_file_extend+0x74f/0x1cf0\n[   70.195998][ T9350]  hfsplus_get_block+0xe16/0x17b0\n[   70.196458][ T9350]  __block_write_begin_int+0x962/0x2ce0\n[   70.196959][ T9350]  cont_write_begin+0x1000/0x1950\n[   70.197416][ T9350]  hfsplus_write_begin+0x85/0x130\n[   70.197873][ T9350]  generic_perform_write+0x3e8/0x1060\n[   70.198374][ T9350]  __generic_file_write_iter+0x215/0x460\n[   70.198892][ T9350]  generic_file_write_iter+0x109/0x5e0\n[   70.199393][ T9350]  vfs_write+0xb0f/0x14e0\n[   70.199771][ T9350]  ksys_write+0x23e/0x490\n[   70.200149][ T9350]  __x64_sys_write+0x97/0xf0\n[   70.200570][ T9350]  x64_sys_call+0x3015/0x3cf0\n[   70.201065][ T9350]  do_syscall_64+0xd9/0x1d0\n[   70.201506][ T9350]  entry_SYSCALL_64_after_hwframe+0x77/0x7f\n[   70.202054][ T9350]\n[   70.202279][ T9350] Uninit was created at:\n[   70.202693][ T9350]  __kmalloc_noprof+0x621/0xf80\n[   70.203149][ T9350]  hfsplus_find_init+0x8d/0x1d0\n[   70.203602][ T9350]  hfsplus_file_extend+0x6ca/0x1cf0\n[   70.204087][ T9350]  hfsplus_get_block+0xe16/0x17b0\n[   70.204561][ T9350]  __block_write_begin_int+0x962/0x2ce0\n[   70.205074][ T9350]  cont_write_begin+0x1000/0x1950\n[   70.205547][ T9350]  hfsplus_write_begin+0x85/0x130\n[   70.206017][ T9350]  generic_perform_write+0x3e8/0x1060\n[   70.206519][ T9350]  __generic_file_write_iter+0x215/0x460\n[   70.207042][ T9350]  generic_file_write_iter+0x109/0x5e0\n[   70.207552][ T9350]  vfs_write+0xb0f/0x14e0\n[   70.207961][ T9350]  ksys_write+0x23e/0x490\n[   70.208375][ T9350]  __x64_sys_write+0x97/0xf0\n[   70.208810][ T9350]  x64_sys_call+0x3015/0x3cf0\n[   70.209255][ T9350]  do_syscall_64+0xd9/0x1d0\n[   70.209680][ T9350]  entry_SYSCALL_64_after_hwframe+0x77/0x7f\n[   70.210230][ T9350]\n[   70.210454][ T9350] CPU: 2 UID: 0 PID: 9350 Comm: repro Not tainted 6.12.0-rc5 #5\n[   70.211174][ T9350] Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\n[   70.212115][ T9350] =====================================================\n[   70.212734][ T9350] Disabling lock debugging due to kernel taint\n[   70.213284][ T9350] Kernel panic - not syncing: kmsan.panic set ...\n[   70.213858][ T9350] CPU: 2 UID: 0 PID: 9350 Comm: repro Tainted: G    B              6.12.0-rc5 #5\n[   70.214679][ T9350] Tainted: [B]=BAD_PAGE\n[   70.215057][ T9350] Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\n[   70.215999][ T9350] Call Trace:\n[   70.216309][ T9350]  \u003cTASK\u003e\n[   70.216585][ T9350]  dump_stack_lvl+0x1fd/0x2b0\n[   70.217025][ T9350]  dump_stack+0x1e/0x30\n[   70.217421][ T9350]  panic+0x502/0xca0\n[   70.217803][ T9350]  ? kmsan_get_metadata+0x13e/0x1c0\n\n[   70.218294][ Message fromT sy9350]  kmsan_report+0x296/slogd@syzkaller 0x2aat Aug 18 22:11:058 ...\n kernel\n:[   70.213284][ T9350] Kernel panic - not syncing: kmsan.panic [   70.220179][ T9350]  ? kmsan_get_metadata+0x13e/0x1c0\nset ...\n[   70.221254][ T9350]  ? __msan_warning+0x96/0x120\n[   70.222066][ T9350]  ? __hfsplus_ext_cache_extent+0x7d0/0x990\n[   70.223023][ T9350]  ? hfsplus_file_extend+0x74f/0x1cf0\n[   70.224120][ T9350]  ? hfsplus_get_block+0xe16/0x17b0\n[   70.224946][ T9350]  ? __block_write_begin_int+0x962/0x2ce0\n[   70.225756][ T9350]  ? cont_write_begin+0x1000/0x1950\n[   70.226337][ T9350]  ? hfsplus_write_begin+0x85/0x130\n[   70.226852][ T9350]  ? generic_perform_write+0x3e8/0x1060\n[   70.227405][ T9350]  ? __generic_file_write_iter+0x215/0x460\n[   70.227979][ T9350]  ? generic_file_write_iter+0x109/0x5e0\n[   70.228540][ T9350]  ? vfs_write+0xb0f/0x14e0\n[   70.228997][ T9350]  ? ksys_write+0x23e/0x490\n---truncated---"
          }
        ],
        "id": "CVE-2025-40244",
        "lastModified": "2026-07-30T06:24:20.907",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2025-12-04T16:16:17.670",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/14c673a2f3ecf650b694a52a88688f1d71849899"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/4840ceadef4290c56cc422f0fc697655f3cbf070"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/99202d94909d323a30d154ab0261c0a07166daec"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/a5bfb13b4f406aef1a450f99d22d3e48df01528c"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/b8a72692aa42b7dcd179a96b90bc2763ac74576a"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/c135b8dca65526aa5b8814e9954e0ae317d9c598"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/c1ec90bed504640a42bb20a5f413be39cd17ad71"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/d7e313039a8f3a6ee072dc5ff4643234d2d735cf"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-30T08:38:08+00:00",
      "cve": "CVE-2025-40244",
      "id": "CVE-2025-40244",
      "initial_release_date": "2025-12-04T00:00:00+00:00",
      "product_status:known_affected": "14",
      "product_status:known_not_affected": "260",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: hfsplus: fix KMSAN uninit-value issue in __hfsplus_ext_cache_extent()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-40244.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-30T15:30:19Z",
      "cve": "CVE-2025-40244",
      "id": "CVE-2025-40244",
      "initial_release_date": "2025-12-05T00:25:38Z",
      "product_status:known_affected": "394",
      "product_status:known_not_affected": "392",
      "product_status:recommended": "249",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-40244",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-40244.json",
      "version": "36"
    }
  }
}



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