CVE-2025-40244

Estado: AplazadaAlta (7.8)—

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():

Detalles técnicos trazas, registros y código del informe original

[   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---

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Puntuación base: 7.8

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.15%
Percentil entre todas las CVEs puntuadas: 4
Fecha de la puntuación: 5/10/2026

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

ExplotaciónT1068 Exploitation for Privilege Escalationprivilege escalation85 %
Impacto principalT1499.004 Application or System Exploitationimpact75 %

Acceso local (AV:L) sin interacción (UI:N) permite escalada de privilegios mediante uninit-value en HFS+ que causa kernel panic/DoS.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Threat Intelligence Program Filter Network Traffic Execution Prevention Application Isolation and Sandboxing Exploit Protection Update Software

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux Kernel^AI

Referencias

JSON original (NVD)

Mostrar

{
  "id": "CVE-2025-40244",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.8,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "lessThan": "c1ec90bed504640a42bb20a5f413be39cd17ad71",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "lessThan": "b8a72692aa42b7dcd179a96b90bc2763ac74576a",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "lessThan": "c135b8dca65526aa5b8814e9954e0ae317d9c598",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "lessThan": "d7e313039a8f3a6ee072dc5ff4643234d2d735cf",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "lessThan": "a5bfb13b4f406aef1a450f99d22d3e48df01528c",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "lessThan": "99202d94909d323a30d154ab0261c0a07166daec",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "lessThan": "14c673a2f3ecf650b694a52a88688f1d71849899",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "lessThan": "4840ceadef4290c56cc422f0fc697655f3cbf070",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "fs/hfsplus/bfind.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.12"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "2.6.12",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.4.301",
              "versionType": "semver",
              "lessThanOrEqual": "5.4.*"
            },
            {
              "status": "unaffected",
              "version": "5.10.246",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "status": "unaffected",
              "version": "5.15.196",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.158",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.115",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.56",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.17.6",
              "versionType": "semver",
              "lessThanOrEqual": "6.17.*"
            },
            {
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "fs/hfsplus/bfind.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-12-04T16:16:17.670",
  "references": [
    {
      "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",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Deferred",
  "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]  <TASK>\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---"
    }
  ],
  "lastModified": "2026-07-30T06:24:20.907",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}