CVE-2023-53217

Estado: ModificadaAlta (7.8)—

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

nubus: Partially revert proc_create_single_data() conversion

The conversion to proc_create_single_data() introduced a regression whereby reading a file in /proc/bus/nubus results in a seg fault:

The proc_create_single_data() conversion does not work because single_open(file, nubus_proc_rsrc_show, PDE_DATA(inode)) is not equivalent to the original code.

Detalles técnicos trazas, registros y código del informe original

    # grep -r . /proc/bus/nubus/e/
    Data read fault at 0x00000020 in Super Data (pc=0x1074c2)
    BAD KERNEL BUSERR
    Oops: 00000000
    Modules linked in:
    PC: [<001074c2>] PDE_DATA+0xc/0x16
    SR: 2010  SP: 38284958  a2: 01152370
    d0: 00000001    d1: 01013000    d2: 01002790    d3: 00000000
    d4: 00000001    d5: 0008ce2e    a0: 00000000    a1: 00222a40
    Process grep (pid: 45, task=142f8727)
    Frame format=B ssw=074d isc=2008 isb=4e5e daddr=00000020 dobuf=01199e70
    baddr=001074c8 dibuf=ffffffff ver=f
    Stack from 01199e48:
	    01199e70 00222a58 01002790 00000000 011a3000 01199eb0 015000c0 00000000
	    00000000 01199ec0 01199ec0 000d551a 011a3000 00000001 00000000 00018000
	    d003f000 00000003 00000001 0002800d 01052840 01199fa8 c01f8000 00000000
	    00000029 0b532b80 00000000 00000000 00000029 0b532b80 01199ee4 00103640
	    011198c0 d003f000 00018000 01199fa8 00000000 011198c0 00000000 01199f4c
	    000b3344 011198c0 d003f000 00018000 01199fa8 00000000 00018000 011198c0
    Call Trace: [<00222a58>] nubus_proc_rsrc_show+0x18/0xa0
     [<000d551a>] seq_read+0xc4/0x510
     [<00018000>] fp_fcos+0x2/0x82
     [<0002800d>] __sys_setreuid+0x115/0x1c6
     [<00103640>] proc_reg_read+0x5c/0xb0
     [<00018000>] fp_fcos+0x2/0x82
     [<000b3344>] __vfs_read+0x2c/0x13c
     [<00018000>] fp_fcos+0x2/0x82
     [<00018000>] fp_fcos+0x2/0x82
     [<000b8aa2>] sys_statx+0x60/0x7e
     [<000b34b6>] vfs_read+0x62/0x12a
     [<00018000>] fp_fcos+0x2/0x82
     [<00018000>] fp_fcos+0x2/0x82
     [<000b39c2>] ksys_read+0x48/0xbe
     [<00018000>] fp_fcos+0x2/0x82
     [<000b3a4e>] sys_read+0x16/0x1a
     [<00018000>] fp_fcos+0x2/0x82
     [<00002b84>] syscall+0x8/0xc
     [<00018000>] fp_fcos+0x2/0x82
     [<0000c016>] not_ext+0xa/0x18
    Code: 4e5e 4e75 4e56 0000 206e 0008 2068 ffe8 <2068> 0020 2008 4e5e 4e75 4e56 0000 2f0b 206e 0008 2068 0004 2668 0020 206b ffe8
    Disabling lock debugging due to kernel taint

    Segmentation fault

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: 0.17%
Percentil entre todas las CVEs puntuadas: 6
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).

🎯 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 %

Vulnerabilidad local en kernel Linux que causa seg fault al acceder a /proc/bus/nubus; AV:L+PR:L sin UI indica escalada. Impacto: denegación de servicio por crash 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

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

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

NVD-CWE-noinfo

Referencias

JSON original (NVD)

Mostrar

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    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnubus: Partially revert proc_create_single_data() conversion\n\nThe conversion to proc_create_single_data() introduced a regression\nwhereby reading a file in /proc/bus/nubus results in a seg fault:\n\n    # grep -r . /proc/bus/nubus/e/\n    Data read fault at 0x00000020 in Super Data (pc=0x1074c2)\n    BAD KERNEL BUSERR\n    Oops: 00000000\n    Modules linked in:\n    PC: [<001074c2>] PDE_DATA+0xc/0x16\n    SR: 2010  SP: 38284958  a2: 01152370\n    d0: 00000001    d1: 01013000    d2: 01002790    d3: 00000000\n    d4: 00000001    d5: 0008ce2e    a0: 00000000    a1: 00222a40\n    Process grep (pid: 45, task=142f8727)\n    Frame format=B ssw=074d isc=2008 isb=4e5e daddr=00000020 dobuf=01199e70\n    baddr=001074c8 dibuf=ffffffff ver=f\n    Stack from 01199e48:\n\t    01199e70 00222a58 01002790 00000000 011a3000 01199eb0 015000c0 00000000\n\t    00000000 01199ec0 01199ec0 000d551a 011a3000 00000001 00000000 00018000\n\t    d003f000 00000003 00000001 0002800d 01052840 01199fa8 c01f8000 00000000\n\t    00000029 0b532b80 00000000 00000000 00000029 0b532b80 01199ee4 00103640\n\t    011198c0 d003f000 00018000 01199fa8 00000000 011198c0 00000000 01199f4c\n\t    000b3344 011198c0 d003f000 00018000 01199fa8 00000000 00018000 011198c0\n    Call Trace: [<00222a58>] nubus_proc_rsrc_show+0x18/0xa0\n     [<000d551a>] seq_read+0xc4/0x510\n     [<00018000>] fp_fcos+0x2/0x82\n     [<0002800d>] __sys_setreuid+0x115/0x1c6\n     [<00103640>] proc_reg_read+0x5c/0xb0\n     [<00018000>] fp_fcos+0x2/0x82\n     [<000b3344>] __vfs_read+0x2c/0x13c\n     [<00018000>] fp_fcos+0x2/0x82\n     [<00018000>] fp_fcos+0x2/0x82\n     [<000b8aa2>] sys_statx+0x60/0x7e\n     [<000b34b6>] vfs_read+0x62/0x12a\n     [<00018000>] fp_fcos+0x2/0x82\n     [<00018000>] fp_fcos+0x2/0x82\n     [<000b39c2>] ksys_read+0x48/0xbe\n     [<00018000>] fp_fcos+0x2/0x82\n     [<000b3a4e>] sys_read+0x16/0x1a\n     [<00018000>] fp_fcos+0x2/0x82\n     [<00002b84>] syscall+0x8/0xc\n     [<00018000>] fp_fcos+0x2/0x82\n     [<0000c016>] not_ext+0xa/0x18\n    Code: 4e5e 4e75 4e56 0000 206e 0008 2068 ffe8 <2068> 0020 2008 4e5e 4e75 4e56 0000 2f0b 206e 0008 2068 0004 2668 0020 206b ffe8\n    Disabling lock debugging due to kernel taint\n\n    Segmentation fault\n\nThe proc_create_single_data() conversion does not work because\nsingle_open(file, nubus_proc_rsrc_show, PDE_DATA(inode)) is not\nequivalent to the original code."
    }
  ],
  "lastModified": "2026-06-17T06:44:32.090",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
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              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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}