Описание
In the Linux kernel before 5.2.10, there is a race condition bug that can be caused by a malicious USB device in the USB character device driver layer, aka CID-303911cfc5b9. This affects drivers/usb/core/file.c.
A flaw was found in the Linux kernel, where there is a race condition bug that can be caused by a malicious USB device in the USB character device driver layer. An attacker who can hotplug at least two devices of this class can cause a use-after-free situation.
Меры по смягчению последствий
Many Character devices can trigger this flaw as they leverage the lower levels of the USB subsystem. The safest method that I have found would be to disable USB ports that are able to be attacked using this method, disable them first by disallowing them from waking up from low-power states with the command (Replace X with the port number available). echo disabled >> /sys/bus/usb/devices/usbX/power/wakeup The system must also disable the specific ports power after with the command: echo suspend | sudo tee /sys/bus/usb/devices/usbX/power/level This change not persist through system reboots and must be applied at each reboot to be effective.
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| Red Hat Enterprise Linux 5 | kernel | Out of support scope | ||
| Red Hat Enterprise Linux 6 | kernel | Will not fix | ||
| Red Hat Enterprise Linux 7 | kernel-alt | Will not fix | ||
| Red Hat Enterprise MRG 2 | kernel-rt | Will not fix | ||
| Red Hat Enterprise Linux 7 | kernel-rt | Fixed | RHSA-2020:4062 | 29.09.2020 |
| Red Hat Enterprise Linux 7 | kernel | Fixed | RHSA-2020:4060 | 29.09.2020 |
| Red Hat Enterprise Linux 8 | kernel-rt | Fixed | RHSA-2020:4609 | 04.11.2020 |
| Red Hat Enterprise Linux 8 | kernel | Fixed | RHSA-2020:4431 | 04.11.2020 |
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Дополнительная информация
Статус:
4.2 Medium
CVSS3
Связанные уязвимости
In the Linux kernel before 5.2.10, there is a race condition bug that can be caused by a malicious USB device in the USB character device driver layer, aka CID-303911cfc5b9. This affects drivers/usb/core/file.c.
In the Linux kernel before 5.2.10, there is a race condition bug that can be caused by a malicious USB device in the USB character device driver layer, aka CID-303911cfc5b9. This affects drivers/usb/core/file.c.
In the Linux kernel before 5.2.10, there is a race condition bug that ...
In the Linux kernel before 5.2.10, there is a race condition bug that can be caused by a malicious USB device in the USB character device driver layer, aka CID-303911cfc5b9. This affects drivers/usb/core/file.c.
Уязвимость драйвера drivers/usb/core/file.c ядра операционной системы Linux, позволяющая нарушителю вызвать отказ в обслуживании
4.2 Medium
CVSS3