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CVE-2022-48994

Estado: AnalizadaMedia (5.5)—

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

ALSA: seq: Fix function prototype mismatch in snd_seq_expand_var_event

With clang's kernel control flow integrity (kCFI, CONFIG_CFI_CLANG), indirect call targets are validated against the expected function pointer prototype to make sure the call target is valid to help mitigate ROP attacks. If they are not identical, there is a failure at run time, which manifests as either a kernel panic or thread getting killed.

seq_copy_in_user() and seq_copy_in_kernel() did not have prototypes matching snd_seq_dump_func_t. Adjust this and remove the casts. There are not resulting binary output differences.

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This was found as a result of Clang's new -Wcast-function-type-strict flag, which is more sensitive than the simpler -Wcast-function-type, which only checks for type width mismatches.

CVSS

Probabilidad de explotación (EPSS)

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

Referencias

JSON original (NVD)

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: seq: Fix function prototype mismatch in snd_seq_expand_var_event\n\nWith clang's kernel control flow integrity (kCFI, CONFIG_CFI_CLANG),\nindirect call targets are validated against the expected function\npointer prototype to make sure the call target is valid to help mitigate\nROP attacks. If they are not identical, there is a failure at run time,\nwhich manifests as either a kernel panic or thread getting killed.\n\nseq_copy_in_user() and seq_copy_in_kernel() did not have prototypes\nmatching snd_seq_dump_func_t. Adjust this and remove the casts. There\nare not resulting binary output differences.\n\nThis was found as a result of Clang's new -Wcast-function-type-strict\nflag, which is more sensitive than the simpler -Wcast-function-type,\nwhich only checks for type width mismatches."
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      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ALSA: seq: Fix function prototipo desajuste en snd_seq_expand_var_event Con la integridad del flujo de control del kernel de clang (kCFI, CONFIG_CFI_CLANG), los objetivos de llamada indirecta se validan contra el prototipo de puntero de función esperado para asegurarse de que el objetivo de llamada sea válido para ayudar a mitigar los ataques ROP. Si no son idénticos, hay un error en el tiempo de ejecución, que se manifiesta como un pánico del kernel o la muerte del hilo. seq_copy_in_user() y seq_copy_in_kernel() no tenían prototipos que coincidieran con snd_seq_dump_func_t. Ajústelo y elimine las conversiones. No hay diferencias de salida binaria resultantes. Esto se encontró como resultado del nuevo indicador -Wcast-function-type-strict de Clang, que es más sensible que el más simple -Wcast-function-type, que solo verifica los desajustes de ancho de tipo."
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