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CVE-2021-47631

Estado: ModificadaMedia (5.5)—

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

ARM: davinci: da850-evm: Avoid NULL pointer dereference

With newer versions of GCC, there is a panic in da850_evm_config_emac() when booting multi_v5_defconfig in QEMU under the palmetto-bmc machine:

The emac_pdata pointer in soc_info is NULL because davinci_soc_info only gets populated on davinci machines but da850_evm_config_emac() is called on all machines via device_initcall().

Move the rmii_en assignment below the machine check so that it is only dereferenced when running on a supported SoC.

Detalles técnicos trazas, registros y código del informe original
Unable to handle kernel NULL pointer dereference at virtual address 00000020
pgd = (ptrval)
[00000020] *pgd=00000000
Internal error: Oops: 5 [#1] PREEMPT ARM
Modules linked in:
CPU: 0 PID: 1 Comm: swapper Not tainted 5.15.0 #1
Hardware name: Generic DT based system
PC is at da850_evm_config_emac+0x1c/0x120
LR is at do_one_initcall+0x50/0x1e0

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)

Mostrar
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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nARM: davinci: da850-evm: Avoid NULL pointer dereference\n\nWith newer versions of GCC, there is a panic in da850_evm_config_emac()\nwhen booting multi_v5_defconfig in QEMU under the palmetto-bmc machine:\n\nUnable to handle kernel NULL pointer dereference at virtual address 00000020\npgd = (ptrval)\n[00000020] *pgd=00000000\nInternal error: Oops: 5 [#1] PREEMPT ARM\nModules linked in:\nCPU: 0 PID: 1 Comm: swapper Not tainted 5.15.0 #1\nHardware name: Generic DT based system\nPC is at da850_evm_config_emac+0x1c/0x120\nLR is at do_one_initcall+0x50/0x1e0\n\nThe emac_pdata pointer in soc_info is NULL because davinci_soc_info only\ngets populated on davinci machines but da850_evm_config_emac() is called\non all machines via device_initcall().\n\nMove the rmii_en assignment below the machine check so that it is only\ndereferenced when running on a supported SoC."
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      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ARM: davinci: da850-evm: Evitar la desreferencia de puntero NULL Con versiones más nuevas de GCC, hay un pánico en da850_evm_config_emac() al iniciar multi_v5_defconfig en QEMU bajo la máquina palmetto-bmc: No se puede manejar la desreferencia de puntero NULL del kernel en la dirección virtual 00000020 pgd = (ptrval) [00000020] *pgd=00000000 Error interno: Oops: 5 [#1] PREEMPT Módulos ARM vinculados: CPU: 0 PID: 1 Comm: swapper No contaminado 5.15.0 #1 Nombre del hardware: Sistema genérico basado en DT La PC está en da850_evm_config_emac+0x1c/0x120 LR está en El puntero emac_pdata en soc_info es NULL porque davinci_soc_info solo se completa en máquinas davinci, pero se llama a da850_evm_config_emac() en todas las máquinas a través de device_initcall(). Mueva la asignación rmii_en debajo de la verificación de la máquina para que solo se desreferencia cuando se ejecuta en un SoC compatible."
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