CVE-2022-50093

Estado: AnalizadaAlta (7.1)—

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

iommu/vt-d: avoid invalid memory access via node_online(NUMA_NO_NODE)

after converting the type of the first argument (@nr, bit number) of arch_test_bit() from `long` to `unsigned long`[0].

Under certain conditions (for example, when ACPI NUMA is disabled via command line), pxm_to_node() can return %NUMA_NO_NODE (-1). It is valid 'magic' number of NUMA node, but not valid bit number to use in bitops. node_online() eventually descends to test_bit() without checking for the input, assuming it's on caller side (which might be good for perf-critical tasks). There, -1 becomes %ULONG_MAX which leads to an insane array index when calculating bit position in memory.

Leer descripción completaMostrar menos

For now, add an explicit check for @node being not %NUMA_NO_NODE before calling test_bit(). The actual logics didn't change here at all.

[0] https://github.com/norov/linux/commit/0e862838f290147ea9c16db852d8d494b552d38d

Detalles técnicos trazas, registros y código del informe original

KASAN reports:

[ 4.668325][ T0] BUG: KASAN: wild-memory-access in dmar_parse_one_rhsa (arch/x86/include/asm/bitops.h:214 arch/x86/include/asm/bitops.h:226 include/asm-generic/bitops/instrumented-non-atomic.h:142 include/linux/nodemask.h:415 drivers/iommu/intel/dmar.c:497)
[    4.676149][    T0] Read of size 8 at addr 1fffffff85115558 by task swapper/0/0
[    4.683454][    T0]
[    4.685638][    T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.19.0-rc3-00004-g0e862838f290 #1
[    4.694331][    T0] Hardware name: Supermicro SYS-5018D-FN4T/X10SDV-8C-TLN4F, BIOS 1.1 03/02/2016
[    4.703196][    T0] Call Trace:
[    4.706334][    T0]  <TASK>
[ 4.709133][ T0] ? dmar_parse_one_rhsa (arch/x86/include/asm/bitops.h:214 arch/x86/include/asm/bitops.h:226 include/asm-generic/bitops/instrumented-non-atomic.h:142 include/linux/nodemask.h:415 drivers/iommu/intel/dmar.c:497)

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Puntuación base: 7.1

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 escalation75 %
Impacto principalT1059 Command and Scripting Interpreterexecution60 %

Acceso local (AV:L) con privilegios normales (PR:L) permite crash/DoS del kernel via IOMMU VT-d; potencial lectura/ejecución en contexto privilegiado.

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 Privileged Account Management Limit Software Installation Behavior Prevention on Endpoint

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

CWE-125

Referencias

JSON original (NVD)

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niommu/vt-d: avoid invalid memory access via node_online(NUMA_NO_NODE)\n\nKASAN reports:\n\n[ 4.668325][ T0] BUG: KASAN: wild-memory-access in dmar_parse_one_rhsa (arch/x86/include/asm/bitops.h:214 arch/x86/include/asm/bitops.h:226 include/asm-generic/bitops/instrumented-non-atomic.h:142 include/linux/nodemask.h:415 drivers/iommu/intel/dmar.c:497)\n[    4.676149][    T0] Read of size 8 at addr 1fffffff85115558 by task swapper/0/0\n[    4.683454][    T0]\n[    4.685638][    T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.19.0-rc3-00004-g0e862838f290 #1\n[    4.694331][    T0] Hardware name: Supermicro SYS-5018D-FN4T/X10SDV-8C-TLN4F, BIOS 1.1 03/02/2016\n[    4.703196][    T0] Call Trace:\n[    4.706334][    T0]  <TASK>\n[ 4.709133][ T0] ? dmar_parse_one_rhsa (arch/x86/include/asm/bitops.h:214 arch/x86/include/asm/bitops.h:226 include/asm-generic/bitops/instrumented-non-atomic.h:142 include/linux/nodemask.h:415 drivers/iommu/intel/dmar.c:497)\n\nafter converting the type of the first argument (@nr, bit number)\nof arch_test_bit() from `long` to `unsigned long`[0].\n\nUnder certain conditions (for example, when ACPI NUMA is disabled\nvia command line), pxm_to_node() can return %NUMA_NO_NODE (-1).\nIt is valid 'magic' number of NUMA node, but not valid bit number\nto use in bitops.\nnode_online() eventually descends to test_bit() without checking\nfor the input, assuming it's on caller side (which might be good\nfor perf-critical tasks). There, -1 becomes %ULONG_MAX which leads\nto an insane array index when calculating bit position in memory.\n\nFor now, add an explicit check for @node being not %NUMA_NO_NODE\nbefore calling test_bit(). The actual logics didn't change here\nat all.\n\n[0] https://github.com/norov/linux/commit/0e862838f290147ea9c16db852d8d494b552d38d"
    },
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      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: iommu/vt-d: evitar acceso no válido a memoria mediante node_online(NUMA_NO_NODE) KASAN informa: [ 4.668325][ T0] ERROR: KASAN: acceso a memoria salvaje en dmar_parse_one_rhsa (arch/x86/include/asm/bitops.h:214 arch/x86/include/asm/bitops.h:226 include/asm-generic/bitops/instrumented-non-atomic.h:142 include/linux/nodemask.h:415 drivers/iommu/intel/dmar.c:497) [ 4.676149][ T0] Lectura de tamaño 8 en la dirección 1fffffff85115558 por el intercambiador de tareas/0/0 [ 4.683454][ T0] [ 4.685638][ T0] CPU: 0 PID: 0 Comm: swapper/0 No contaminado 5.19.0-rc3-00004-g0e862838f290 #1 [ 4.694331][ T0] Nombre del hardware: Supermicro SYS-5018D-FN4T/X10SDV-8C-TLN4F, BIOS 1.1 02/03/2016 [ 4.703196][ T0] Rastreo de llamadas: [ 4.706334][ T0]  [ 4.709133][ T0] ? dmar_parse_one_rhsa (arch/x86/include/asm/bitops.h:214 arch/x86/include/asm/bitops.h:226 include/asm-generic/bitops/instrumented-non-atomic.h:142 include/linux/nodemask.h:415 drivers/iommu/intel/dmar.c:497) después de convertir el tipo del primer argumento (@nr, número de bit) de arch_test_bit() de `long` a `unsigned long`[0]. Bajo ciertas condiciones (por ejemplo, cuando ACPI NUMA está deshabilitado a través de la línea de comandos), pxm_to_node() puede devolver %NUMA_NO_NODE (-1). Es un número 'mágico' válido de nodo NUMA, pero no un número de bit válido para usar en bitops. node_online() finalmente desciende a test_bit() sin verificar la entrada, asumiendo que está del lado del llamador (lo cual podría ser útil para tareas críticas para el rendimiento). Allí, -1 se convierte en %ULONG_MAX, lo que genera un índice de matriz desproporcionado al calcular la posición del bit en memoria. Por ahora, agregue una verificación explícita de que @node no sea %NUMA_NO_NODE antes de llamar a test_bit(). La lógica real no cambió en absoluto. [0] https://github.com/norov/linux/commit/0e862838f290147ea9c16db852d8d494b552d38d"
    }
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  "lastModified": "2026-06-17T05:22:44.743",
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