CVE-2023-53143

Estado: AnalizadaMedia (5.5)—

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

ext4: fix another off-by-one fsmap error on 1k block filesystems

Apparently syzbot figured out that issuing this FSMAP call:

Produces this crash if the underlying filesystem is a 1k-block ext4 filesystem:

For GETFSMAP calls, the caller selects a physical block device by writing its block number into fsmap_head.fmh_keys[01].fmr_device. To query mappings for a subrange of the device, the starting byte of the range is written to fsmap_head.fmh_keys[0].fmr_physical and the last byte of the range goes in fsmap_head.fmh_keys[1].fmr_physical.

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IOWs, to query what mappings overlap with bytes 3-14 of /dev/sda, you'd set the inputs as follows:

Which would return you whatever is mapped in the 12 bytes starting at physical offset 3.

The crash is due to insufficient range validation of keys[1] in ext4_getfsmap_datadev. On 1k-block filesystems, block 0 is not part of the filesystem, which means that s_first_data_block is nonzero. ext4_get_group_no_and_offset subtracts this quantity from the blocknr argument before cracking it into a group number and a block number within a group. IOWs, block group 0 spans blocks 1-8192 (1-based) instead of 0-8191 (0-based) like what happens with larger blocksizes.

The net result of this encoding is that blocknr < s_first_data_block is not a valid input to this function. The end_fsb variable is set from the keys that are copied from userspace, which means that in the above example, its value is zero. That leads to an underflow here:

The division then operates on -1:

Leaving an impossibly large group number (2^32-1) in blocknr. ext4_getfsmap_check_keys checked that keys[0 ---truncated---

Detalles técnicos trazas, registros y código del informe original

struct fsmap_head cmd = {
	.fmh_count	= ...;
	.fmh_keys	= {
		{ .fmr_device = /* ext4 dev */, .fmr_physical = 0, },
		{ .fmr_device = /* ext4 dev */, .fmr_physical = 0, },
	},
...
};
ret = ioctl(fd, FS_IOC_GETFSMAP, &cmd);

kernel BUG at fs/ext4/ext4.h:3331!
invalid opcode: 0000 [#1] PREEMPT SMP
CPU: 3 PID: 3227965 Comm: xfs_io Tainted: G        W  O       6.2.0-rc8-achx
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.15.0-1 04/01/2014
RIP: 0010:ext4_mb_load_buddy_gfp+0x47c/0x570 [ext4]
RSP: 0018:ffffc90007c03998 EFLAGS: 00010246
RAX: ffff888004978000 RBX: ffffc90007c03a20 RCX: ffff888041618000
RDX: 0000000000000000 RSI: 00000000000005a4 RDI: ffffffffa0c99b11
RBP: ffff888012330000 R08: ffffffffa0c2b7d0 R09: 0000000000000400
R10: ffffc90007c03950 R11: 0000000000000000 R12: 0000000000000001
R13: 00000000ffffffff R14: 0000000000000c40 R15: ffff88802678c398
FS:  00007fdf2020c880(0000) GS:ffff88807e100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd318a5fe8 CR3: 000000007f80f001 CR4: 00000000001706e0
Call Trace:
 <TASK>
 ext4_mballoc_query_range+0x4b/0x210 [ext4 dfa189daddffe8fecd3cdfd00564e0f265a8ab80]
 ext4_getfsmap_datadev+0x713/0x890 [ext4 dfa189daddffe8fecd3cdfd00564e0f265a8ab80]
 ext4_getfsmap+0x2b7/0x330 [ext4 dfa189daddffe8fecd3cdfd00564e0f265a8ab80]
 ext4_ioc_getfsmap+0x153/0x2b0 [ext4 dfa189daddffe8fecd3cdfd00564e0f265a8ab80]
 __ext4_ioctl+0x2a7/0x17e0 [ext4 dfa189daddffe8fecd3cdfd00564e0f265a8ab80]
 __x64_sys_ioctl+0x82/0xa0
 do_syscall_64+0x2b/0x80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7fdf20558aff
RSP: 002b:00007ffd318a9e30 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000000200c0 RCX: 00007fdf20558aff
RDX: 00007fdf1feb2010 RSI: 00000000c0c0583b RDI: 0000000000000003
RBP: 00005625c0634be0 R08: 00005625c0634c40 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fdf1feb2010
R13: 00005625be70d994 R14: 0000000000000800 R15: 0000000000000000

	fmh_keys[0] = { .fmr_device = major(8, 0), .fmr_physical = 3},
	fmh_keys[1] = { .fmr_device = major(8, 0), .fmr_physical = 14},

	blocknr = blocknr - le32_to_cpu(es->s_first_data_block);

	offset = do_div(blocknr, EXT4_BLOCKS_PER_GROUP(sb)) >>
		EXT4_SB(sb)->s_cluster_bits;

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Puntuación base: 5.5

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.19%
Percentil entre todas las CVEs puntuadas: 8
Fecha de la puntuación: 6/10/2026

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).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

CWE-193

Referencias

JSON original (NVD)

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  "cveTags": [],
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        "source": "nvd@nist.gov",
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          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
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          "attackComplexity": "LOW",
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  "published": "2025-05-02T16:15:33.240",
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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      "tags": [
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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    {
      "url": "https://git.kernel.org/stable/c/c5d7c31e17224d847a330180ec1b03bf390632b2",
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      "tags": [
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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    {
      "url": "https://git.kernel.org/stable/c/eb3a695aa71a514f2e7f5778e05faba3733b70a0",
      "tags": [
        "Patch"
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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      "tags": [
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-193"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix another off-by-one fsmap error on 1k block filesystems\n\nApparently syzbot figured out that issuing this FSMAP call:\n\nstruct fsmap_head cmd = {\n\t.fmh_count\t= ...;\n\t.fmh_keys\t= {\n\t\t{ .fmr_device = /* ext4 dev */, .fmr_physical = 0, },\n\t\t{ .fmr_device = /* ext4 dev */, .fmr_physical = 0, },\n\t},\n...\n};\nret = ioctl(fd, FS_IOC_GETFSMAP, &cmd);\n\nProduces this crash if the underlying filesystem is a 1k-block ext4\nfilesystem:\n\nkernel BUG at fs/ext4/ext4.h:3331!\ninvalid opcode: 0000 [#1] PREEMPT SMP\nCPU: 3 PID: 3227965 Comm: xfs_io Tainted: G        W  O       6.2.0-rc8-achx\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.15.0-1 04/01/2014\nRIP: 0010:ext4_mb_load_buddy_gfp+0x47c/0x570 [ext4]\nRSP: 0018:ffffc90007c03998 EFLAGS: 00010246\nRAX: ffff888004978000 RBX: ffffc90007c03a20 RCX: ffff888041618000\nRDX: 0000000000000000 RSI: 00000000000005a4 RDI: ffffffffa0c99b11\nRBP: ffff888012330000 R08: ffffffffa0c2b7d0 R09: 0000000000000400\nR10: ffffc90007c03950 R11: 0000000000000000 R12: 0000000000000001\nR13: 00000000ffffffff R14: 0000000000000c40 R15: ffff88802678c398\nFS:  00007fdf2020c880(0000) GS:ffff88807e100000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00007ffd318a5fe8 CR3: 000000007f80f001 CR4: 00000000001706e0\nCall Trace:\n <TASK>\n ext4_mballoc_query_range+0x4b/0x210 [ext4 dfa189daddffe8fecd3cdfd00564e0f265a8ab80]\n ext4_getfsmap_datadev+0x713/0x890 [ext4 dfa189daddffe8fecd3cdfd00564e0f265a8ab80]\n ext4_getfsmap+0x2b7/0x330 [ext4 dfa189daddffe8fecd3cdfd00564e0f265a8ab80]\n ext4_ioc_getfsmap+0x153/0x2b0 [ext4 dfa189daddffe8fecd3cdfd00564e0f265a8ab80]\n __ext4_ioctl+0x2a7/0x17e0 [ext4 dfa189daddffe8fecd3cdfd00564e0f265a8ab80]\n __x64_sys_ioctl+0x82/0xa0\n do_syscall_64+0x2b/0x80\n entry_SYSCALL_64_after_hwframe+0x46/0xb0\nRIP: 0033:0x7fdf20558aff\nRSP: 002b:00007ffd318a9e30 EFLAGS: 00000246 ORIG_RAX: 0000000000000010\nRAX: ffffffffffffffda RBX: 00000000000200c0 RCX: 00007fdf20558aff\nRDX: 00007fdf1feb2010 RSI: 00000000c0c0583b RDI: 0000000000000003\nRBP: 00005625c0634be0 R08: 00005625c0634c40 R09: 0000000000000001\nR10: 0000000000000000 R11: 0000000000000246 R12: 00007fdf1feb2010\nR13: 00005625be70d994 R14: 0000000000000800 R15: 0000000000000000\n\nFor GETFSMAP calls, the caller selects a physical block device by\nwriting its block number into fsmap_head.fmh_keys[01].fmr_device.\nTo query mappings for a subrange of the device, the starting byte of the\nrange is written to fsmap_head.fmh_keys[0].fmr_physical and the last\nbyte of the range goes in fsmap_head.fmh_keys[1].fmr_physical.\n\nIOWs, to query what mappings overlap with bytes 3-14 of /dev/sda, you'd\nset the inputs as follows:\n\n\tfmh_keys[0] = { .fmr_device = major(8, 0), .fmr_physical = 3},\n\tfmh_keys[1] = { .fmr_device = major(8, 0), .fmr_physical = 14},\n\nWhich would return you whatever is mapped in the 12 bytes starting at\nphysical offset 3.\n\nThe crash is due to insufficient range validation of keys[1] in\next4_getfsmap_datadev.  On 1k-block filesystems, block 0 is not part of\nthe filesystem, which means that s_first_data_block is nonzero.\next4_get_group_no_and_offset subtracts this quantity from the blocknr\nargument before cracking it into a group number and a block number\nwithin a group.  IOWs, block group 0 spans blocks 1-8192 (1-based)\ninstead of 0-8191 (0-based) like what happens with larger blocksizes.\n\nThe net result of this encoding is that blocknr < s_first_data_block is\nnot a valid input to this function.  The end_fsb variable is set from\nthe keys that are copied from userspace, which means that in the above\nexample, its value is zero.  That leads to an underflow here:\n\n\tblocknr = blocknr - le32_to_cpu(es->s_first_data_block);\n\nThe division then operates on -1:\n\n\toffset = do_div(blocknr, EXT4_BLOCKS_PER_GROUP(sb)) >>\n\t\tEXT4_SB(sb)->s_cluster_bits;\n\nLeaving an impossibly large group number (2^32-1) in blocknr.\next4_getfsmap_check_keys checked that keys[0\n---truncated---"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ext4: corrige otro error de fsmap de un bloque en sistemas de archivos de 1k Aparentemente, syzbot descubrió que emitir esta llamada FSMAP: Produce este fallo si el sistema de archivos subyacente es un sistema de archivos ext4 de 1k bloques: ¡ERROR del kernel en fs/ext4/ext4.h:3331! Código de operación no válido: 0000 [#1] PREEMPT SMP CPU: 3 PID: 3227965 Comm: xfs_io Contaminado: GWO 6.2.0-rc8-achx Nombre del hardware: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.15.0-1 01/04/2014 RIP: 0010:ext4_mb_load_buddy_gfp+0x47c/0x570 [ext4] RSP: 0018:ffffc90007c03998 EFLAGS: 00010246 RAX: ffff888004978000 RBX: ffffc90007c03a20 RCX: ffff888041618000 RDX: 0000000000000000 RSI: 00000000000005a4 RDI: ffffffffa0c99b11 RBP: ffff888012330000 R08: ffffffffa0c2b7d0 R09: 0000000000000400 R10: ffffc90007c03950 R11: 0000000000000000 R12: 000000000000001 R13: 00000000ffffffff R14: 0000000000000c40 R15: ffff88802678c398 FS: 00007fdf2020c880(0000) GS:ffff88807e100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffd318a5fe8 CR3: 000000007f80f001 CR4: 00000000001706e0 Rastreo de llamadas:  ext4_mballoc_query_range+0x4b/0x210 [ext4 dfa189daddffe8fecd3cdfd00564e0f265a8ab80] ext4_getfsmap_datadev+0x713/0x890 [ext4 dfa189daddffe8fecd3cdfd00564e0f265a8ab80] ext4_getfsmap+0x2b7/0x330 [ext4 dfa189daddffe8fecd3cdfd00564e0f265a8ab80] ext4_ioc_getfsmap+0x153/0x2b0 [ext4 dfa189daddffe8fecd3cdfd00564e0f265a8ab80] __ext4_ioctl+0x2a7/0x17e0 [ext4 dfa189daddffe8fecd3cdfd00564e0f265a8ab80] __x64_sys_ioctl+0x82/0xa0 hacer_llamada_al_sistema_64+0x2b/0x80 entrada_LLAMADA_AL_SISTEMA_64_después_de_hwframe+0x46/0xb0 RIP: 0033:0x7fdf20558aff RSP: 002b:00007ffd318a9e30 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000000200c0 RCX: 00007fdf20558aff RDX: 00007fdf1feb2010 RSI: 00000000c0c0583b RDI: 0000000000000003 RBP: 00005625c0634be0 R08: 00005625c0634c40 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fdf1feb2010 R13: 00005625be70d994 R14: 000000000000800 R15: 000000000000000 Para las llamadas GETFSMAP, el llamador selecciona un dispositivo de bloque físico escribiendo su número de bloque en fsmap_head.fmh_keys[01].fmr_device. Para consultar las asignaciones de un subrango del dispositivo, el byte inicial del rango se escribe en fsmap_head.fmh_keys[0].fmr_physical y el último byte en fsmap_head.fmh_keys[1].fmr_physical. IOWs, para consultar qué asignaciones se superponen con los bytes 3-14 de /dev/sda, debe configurar las entradas de la siguiente manera: fmh_keys[0] = { .fmr_device = major(8, 0), .fmr_physical = 3}, fmh_keys[1] = { .fmr_device = major(8, 0), .fmr_physical = 14}, lo que le devolvería lo que esté asignado en los 12 bytes a partir del desplazamiento físico 3. El fallo se debe a una validación de rango insuficiente de keys[1] en ext4_getfsmap_datadev. En sistemas de archivos de 1k bloques, el bloque 0 no forma parte del sistema de archivos, lo que significa que s_first_data_block es distinto de cero. ext4_get_group_no_and_offset resta esta cantidad del argumento blocknr antes de descomponerlo en un número de grupo y un número de bloque dentro de un grupo. En las IOW, el grupo de bloques 0 abarca los bloques 1-8192 (basado en 1) en lugar de 0-8191 (basado en 0), como ocurre con tamaños de bloque mayores. El resultado final de esta codificación es que blocknr &lt; s_first_data_block no es una entrada válida para esta función. La variable end_fsb se establece a partir de las claves copiadas del espacio de usuario, lo que significa que, en el ejemplo anterior, su valor es cero. Esto genera un desbordamiento por debajo de la capacidad: blocknr = blocknr - le32_to_cpu(es-&gt;s_first_data_block); La división opera entonces sobre -1: offset = do_div(blocknr, EXT4_BLOCKS_PER_GROUP(sb)) &gt;&gt; EXT4_SB(sb)-&gt;s_cluster_bits; De esta manera, se deja un número de grupo imposiblemente grande (2^32-1) en blocknr. ext4_getfsmap_check_keys verificó que keys[0 ---truncado---"
    }
  ],
  "lastModified": "2026-06-17T06:44:22.710",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "2A7D3CCD-563A-43C8-81D5-6EA850FBB5DF",
              "versionEndExcluding": "4.14.310",
              "versionStartIncluding": "4.13"
            },
            {
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