CVE-2024-56548

Estado: ModificadaAlta (7.8)—

In the Linux kernel, the following vulnerability has been resolved:

hfsplus: don't query the device logical block size multiple times

Devices block sizes may change. One of these cases is a loop device by using ioctl LOOP_SET_BLOCK_SIZE.

While this may cause other issues like IO being rejected, in the case of hfsplus, it will allocate a block by using that size and potentially write out-of-bounds when hfsplus_read_wrapper calls hfsplus_submit_bio and the latter function reads a different io_size.

Using a new min_io_size initally set to sb_min_blocksize works for the purposes of the original fix, since it will be set to the max between HFSPLUS_SECTOR_SIZE and the first seen logical block size.

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We still use the max between HFSPLUS_SECTOR_SIZE and min_io_size in case the latter is not initialized.

Tested by mounting an hfsplus filesystem with loop block sizes 512, 1024 and 4096.

The produced KASAN report before the fix looks like this:

Detalles técnicos trazas, registros y código del informe original

[  419.944641] ==================================================================
[  419.945655] BUG: KASAN: slab-use-after-free in hfsplus_read_wrapper+0x659/0xa0a
[  419.946703] Read of size 2 at addr ffff88800721fc00 by task repro/10678
[  419.947612]
[  419.947846] CPU: 0 UID: 0 PID: 10678 Comm: repro Not tainted 6.12.0-rc5-00008-gdf56e0f2f3ca #84
[  419.949007] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.15.0-1 04/01/2014
[  419.950035] Call Trace:
[  419.950384]  <TASK>
[  419.950676]  dump_stack_lvl+0x57/0x78
[  419.951212]  ? hfsplus_read_wrapper+0x659/0xa0a
[  419.951830]  print_report+0x14c/0x49e
[  419.952361]  ? __virt_addr_valid+0x267/0x278
[  419.952979]  ? kmem_cache_debug_flags+0xc/0x1d
[  419.953561]  ? hfsplus_read_wrapper+0x659/0xa0a
[  419.954231]  kasan_report+0x89/0xb0
[  419.954748]  ? hfsplus_read_wrapper+0x659/0xa0a
[  419.955367]  hfsplus_read_wrapper+0x659/0xa0a
[  419.955948]  ? __pfx_hfsplus_read_wrapper+0x10/0x10
[  419.956618]  ? do_raw_spin_unlock+0x59/0x1a9
[  419.957214]  ? _raw_spin_unlock+0x1a/0x2e
[  419.957772]  hfsplus_fill_super+0x348/0x1590
[  419.958355]  ? hlock_class+0x4c/0x109
[  419.958867]  ? __pfx_hfsplus_fill_super+0x10/0x10
[  419.959499]  ? __pfx_string+0x10/0x10
[  419.960006]  ? lock_acquire+0x3e2/0x454
[  419.960532]  ? bdev_name.constprop.0+0xce/0x243
[  419.961129]  ? __pfx_bdev_name.constprop.0+0x10/0x10
[  419.961799]  ? pointer+0x3f0/0x62f
[  419.962277]  ? __pfx_pointer+0x10/0x10
[  419.962761]  ? vsnprintf+0x6c4/0xfba
[  419.963178]  ? __pfx_vsnprintf+0x10/0x10
[  419.963621]  ? setup_bdev_super+0x376/0x3b3
[  419.964029]  ? snprintf+0x9d/0xd2
[  419.964344]  ? __pfx_snprintf+0x10/0x10
[  419.964675]  ? lock_acquired+0x45c/0x5e9
[  419.965016]  ? set_blocksize+0x139/0x1c1
[  419.965381]  ? sb_set_blocksize+0x6d/0xae
[  419.965742]  ? __pfx_hfsplus_fill_super+0x10/0x10
[  419.966179]  mount_bdev+0x12f/0x1bf
[  419.966512]  ? __pfx_mount_bdev+0x10/0x10
[  419.966886]  ? vfs_parse_fs_string+0xce/0x111
[  419.967293]  ? __pfx_vfs_parse_fs_string+0x10/0x10
[  419.967702]  ? __pfx_hfsplus_mount+0x10/0x10
[  419.968073]  legacy_get_tree+0x104/0x178
[  419.968414]  vfs_get_tree+0x86/0x296
[  419.968751]  path_mount+0xba3/0xd0b
[  419.969157]  ? __pfx_path_mount+0x10/0x10
[  419.969594]  ? kmem_cache_free+0x1e2/0x260
[  419.970311]  do_mount+0x99/0xe0
[  419.970630]  ? __pfx_do_mount+0x10/0x10
[  419.971008]  __do_sys_mount+0x199/0x1c9
[  419.971397]  do_syscall_64+0xd0/0x135
[  419.971761]  entry_SYSCALL_64_after_hwframe+0x76/0x7e
[  419.972233] RIP: 0033:0x7c3cb812972e
[  419.972564] Code: 48 8b 0d f5 46 0d 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d c2 46 0d 00 f7 d8 64 89 01 48
[  419.974371] RSP: 002b:00007ffe30632548 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5
[  419.975048] RAX: ffffffffffffffda RBX: 00007ffe306328d8 RCX: 00007c3cb812972e
[  419.975701] RDX: 0000000020000000 RSI: 0000000020000c80 RDI:
---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: 0.25%
Percentil entre todas las CVEs puntuadas: 15
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 principalT1059 Command and Scripting Interpreterexecution75 %
Impacto secundarioT1565.001 Stored Data Manipulationimpact70 %

AV:L/PR:L sin UI permite escalada local. KASAN detecta escritura fuera de límites en hfsplus_read_wrapper, posibilitando ejecución de código o corrupción de memoria del kernel.

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

Execution Prevention Threat Intelligence Program Restrict Web-Based Content Restrict File and Directory Permissions Privileged Account Management Remote Data Storage

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

CWE-787
CWE-787

Referencias

JSON original (NVD)

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhfsplus: don't query the device logical block size multiple times\n\nDevices block sizes may change. One of these cases is a loop device by\nusing ioctl LOOP_SET_BLOCK_SIZE.\n\nWhile this may cause other issues like IO being rejected, in the case of\nhfsplus, it will allocate a block by using that size and potentially write\nout-of-bounds when hfsplus_read_wrapper calls hfsplus_submit_bio and the\nlatter function reads a different io_size.\n\nUsing a new min_io_size initally set to sb_min_blocksize works for the\npurposes of the original fix, since it will be set to the max between\nHFSPLUS_SECTOR_SIZE and the first seen logical block size. We still use the\nmax between HFSPLUS_SECTOR_SIZE and min_io_size in case the latter is not\ninitialized.\n\nTested by mounting an hfsplus filesystem with loop block sizes 512, 1024\nand 4096.\n\nThe produced KASAN report before the fix looks like this:\n\n[  419.944641] ==================================================================\n[  419.945655] BUG: KASAN: slab-use-after-free in hfsplus_read_wrapper+0x659/0xa0a\n[  419.946703] Read of size 2 at addr ffff88800721fc00 by task repro/10678\n[  419.947612]\n[  419.947846] CPU: 0 UID: 0 PID: 10678 Comm: repro Not tainted 6.12.0-rc5-00008-gdf56e0f2f3ca #84\n[  419.949007] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.15.0-1 04/01/2014\n[  419.950035] Call Trace:\n[  419.950384]  <TASK>\n[  419.950676]  dump_stack_lvl+0x57/0x78\n[  419.951212]  ? hfsplus_read_wrapper+0x659/0xa0a\n[  419.951830]  print_report+0x14c/0x49e\n[  419.952361]  ? __virt_addr_valid+0x267/0x278\n[  419.952979]  ? kmem_cache_debug_flags+0xc/0x1d\n[  419.953561]  ? hfsplus_read_wrapper+0x659/0xa0a\n[  419.954231]  kasan_report+0x89/0xb0\n[  419.954748]  ? hfsplus_read_wrapper+0x659/0xa0a\n[  419.955367]  hfsplus_read_wrapper+0x659/0xa0a\n[  419.955948]  ? __pfx_hfsplus_read_wrapper+0x10/0x10\n[  419.956618]  ? do_raw_spin_unlock+0x59/0x1a9\n[  419.957214]  ? _raw_spin_unlock+0x1a/0x2e\n[  419.957772]  hfsplus_fill_super+0x348/0x1590\n[  419.958355]  ? hlock_class+0x4c/0x109\n[  419.958867]  ? __pfx_hfsplus_fill_super+0x10/0x10\n[  419.959499]  ? __pfx_string+0x10/0x10\n[  419.960006]  ? lock_acquire+0x3e2/0x454\n[  419.960532]  ? bdev_name.constprop.0+0xce/0x243\n[  419.961129]  ? __pfx_bdev_name.constprop.0+0x10/0x10\n[  419.961799]  ? pointer+0x3f0/0x62f\n[  419.962277]  ? __pfx_pointer+0x10/0x10\n[  419.962761]  ? vsnprintf+0x6c4/0xfba\n[  419.963178]  ? __pfx_vsnprintf+0x10/0x10\n[  419.963621]  ? setup_bdev_super+0x376/0x3b3\n[  419.964029]  ? snprintf+0x9d/0xd2\n[  419.964344]  ? __pfx_snprintf+0x10/0x10\n[  419.964675]  ? lock_acquired+0x45c/0x5e9\n[  419.965016]  ? set_blocksize+0x139/0x1c1\n[  419.965381]  ? sb_set_blocksize+0x6d/0xae\n[  419.965742]  ? __pfx_hfsplus_fill_super+0x10/0x10\n[  419.966179]  mount_bdev+0x12f/0x1bf\n[  419.966512]  ? __pfx_mount_bdev+0x10/0x10\n[  419.966886]  ? vfs_parse_fs_string+0xce/0x111\n[  419.967293]  ? __pfx_vfs_parse_fs_string+0x10/0x10\n[  419.967702]  ? __pfx_hfsplus_mount+0x10/0x10\n[  419.968073]  legacy_get_tree+0x104/0x178\n[  419.968414]  vfs_get_tree+0x86/0x296\n[  419.968751]  path_mount+0xba3/0xd0b\n[  419.969157]  ? __pfx_path_mount+0x10/0x10\n[  419.969594]  ? kmem_cache_free+0x1e2/0x260\n[  419.970311]  do_mount+0x99/0xe0\n[  419.970630]  ? __pfx_do_mount+0x10/0x10\n[  419.971008]  __do_sys_mount+0x199/0x1c9\n[  419.971397]  do_syscall_64+0xd0/0x135\n[  419.971761]  entry_SYSCALL_64_after_hwframe+0x76/0x7e\n[  419.972233] RIP: 0033:0x7c3cb812972e\n[  419.972564] Code: 48 8b 0d f5 46 0d 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d c2 46 0d 00 f7 d8 64 89 01 48\n[  419.974371] RSP: 002b:00007ffe30632548 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5\n[  419.975048] RAX: ffffffffffffffda RBX: 00007ffe306328d8 RCX: 00007c3cb812972e\n[  419.975701] RDX: 0000000020000000 RSI: 0000000020000c80 RDI:\n---truncated---"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: hfsplus: no consultar el tamaño del bloque lógico del dispositivo varias veces Los tamaños de bloque de los dispositivos pueden cambiar. Uno de estos casos es un dispositivo de bucle mediante el uso de ioctl LOOP_SET_BLOCK_SIZE. Si bien esto puede causar otros problemas como el rechazo de IO, en el caso de hfsplus, asignará un bloque utilizando ese tamaño y potencialmente escribirá fuera de los límites cuando hfsplus_read_wrapper llame a hfsplus_submit_bio y la última función lea un io_size diferente. El uso de un nuevo min_io_size establecido inicialmente en sb_min_blocksize funciona para los propósitos de la solución original, ya que se establecerá en el máximo entre HFSPLUS_SECTOR_SIZE y el primer tamaño de bloque lógico visto. Todavía usamos el máximo entre HFSPLUS_SECTOR_SIZE y min_io_size en caso de que este último no esté inicializado. Probado montando un sistema de archivos hfsplus con tamaños de bloque de bucle 512, 1024 y 4096. El informe KASAN producido antes de la corrección se ve así: [ 419.944641] ========================================================================= [ 419.945655] ERROR: KASAN: slab-use-after-free en hfsplus_read_wrapper+0x659/0xa0a [ 419.946703] Lectura de tamaño 2 en la dirección ffff88800721fc00 por la tarea repro/10678 [ 419.947612] [ 419.947846] CPU: 0 UID: 0 PID: 10678 Comm: repro No contaminado 6.12.0-rc5-00008-gdf56e0f2f3ca #84 [ 419.949007] Nombre del hardware: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.15.0-1 04/01/2014 [ 419.950035] Seguimiento de llamadas: [ 419.950384]  [ 419.950676] dump_stack_lvl+0x57/0x78 [ 419.951212] ? kmem_cache_debug_flags+0xc/0x1d [ 419.953561] ? hfsplus_read_wrapper+0x659/0xa0a [ 419.954231] kasan_report+0x89/0xb0 [ 419.954748] ? hfsplus_read_wrapper+0x659/0xa0a [ 419.955367] hfsplus_read_wrapper+0x659/0xa0a [ 419.955948] ? __pfx_hfsplus_read_wrapper+0x10/0x10 [ 419.956618] ? do_raw_spin_unlock+0x59/0x1a9 [ 419.957214] ? _raw_spin_unlock+0x1a/0x2e [ 419.957772] hfsplus_fill_super+0x348/0x1590 [ 419.958355] ? hlock_class+0x4c/0x109 [ 419.958867] ? __pfx_hfsplus_fill_super+0x10/0x10 [ 419.959499] ? __pfx_string+0x10/0x10 [ 419.960006] ? lock_acquire+0x3e2/0x454 [ 419.960532] ? bdev_name.constprop.0+0xce/0x243 [ 419.961129] ? __pfx_bdev_name.constprop.0+0x10/0x10 [ 419.961799] ? puntero+0x3f0/0x62f [ 419.962277] ? __pfx_pointer+0x10/0x10 [ 419.962761] ? vsnprintf+0x6c4/0xfba [ 419.963178] ? __pfx_vsnprintf+0x10/0x10 [ 419.963621] ? setup_bdev_super+0x376/0x3b3 [ 419.964029] ? snprintf+0x9d/0xd2 [ 419.964344] ? __pfx_snprintf+0x10/0x10 [ 419.964675] ? lock_acquired+0x45c/0x5e9 [ 419.965016] ? set_blocksize+0x139/0x1c1 [ 419.965381] ? __pfx_hfsplus_fill_super+0x10/0x10 [ 419.966179] mount_bdev+0x12f/0x1bf [ 419.966512] ? __pfx_mount_bdev+0x10/0x10 [ 419.966886] ? vfs_parse_fs_string+0xce/0x111 [ 419.967293] ? __pfx_vfs_parse_fs_string+0x10/0x10 [ 419.967702] ? __pfx_hfsplus_mount+0x10/0x10 [ 419.968073] árbol_obtención_legado+0x104/0x178 [ 419.968414] árbol_obtención_vfs+0x86/0x296 [ 419.968751] montaje_ruta+0xba3/0xd0b [ 419.969157] ? __pfx_path_mount+0x10/0x10 [ 419.969594] ? kmem_cache_free+0x1e2/0x260 [ 419.970311] montaje_ruta+0x99/0xe0 [ 419.970630] ? __pfx_do_mount+0x10/0x10 [ 419.971008] __do_sys_mount+0x199/0x1c9 [ 419.971397] do_syscall_64+0xd0/0x135 [ 419.971761] entry_SYSCALL_64_after_hwframe+0x76/0x7e [ 419.972233] RIP: 0033:0x7c3cb812972e [ 419.972564] Código: 48 8b 0d f5 46 0d 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 49 89 ca b8 a5 00 00 00 0f 05 &lt;48&gt; 3d 01 f0 ff ff 73 01 c3 48 8b 0d c2 46 0d 00 f7 d8 64 89 01 48 [ 419.974371] RSP: 002b:00007ffe30632548 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5 [ 419.975048] RAX: ffffffffffffffda RBX: 00007ffe306328d8 RCX: 00007c3cb812972e [ 419.975701] RDX: 0000000020000000 RSI: 0000000020000c80 RDI: ---truncado---"
    }
  ],
  "lastModified": "2026-06-17T08:12:21.790",
  "configurations": [
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