Описание
In the Linux kernel before 5.3.11, sound/core/timer.c has a use-after-free caused by erroneous code refactoring, aka CID-e7af6307a8a5. This is related to snd_timer_open and snd_timer_close_locked. The timeri variable was originally intended to be for a newly created timer instance, but was used for a different purpose after refactoring.
A memory flaw was found in the ALSA subsystem of the Linux kernel. The struct snd_timer_instance function fails the timer->max_instances check leading to an invalid address. This could lead to a use-after-free vulnerability.
Отчет
This issue affected Linux kernel versions as shipped with Red Hat Enterprise Linux 8 starting with RHEL-8.1.0, that is Red Hat Enterprise Linux 8.1 GA kernel version.
Меры по смягчению последствий
Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update as soon as possible.
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| Red Hat Enterprise Linux 5 | kernel | Not affected | ||
| Red Hat Enterprise Linux 6 | kernel | Not affected | ||
| Red Hat Enterprise Linux 7 | kernel-alt | Not affected | ||
| Red Hat Enterprise MRG 2 | kernel-rt | Not affected | ||
| 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-2020:3016 | 21.07.2020 |
| Red Hat Enterprise Linux 8 | kernel | Fixed | RHSA-2020:3010 | 21.07.2020 |
| Red Hat Enterprise Linux 8.1 Extended Update Support | kernel | Fixed | RHSA-2020:3222 | 29.07.2020 |
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Дополнительная информация
Статус:
7.8 High
CVSS3
Связанные уязвимости
In the Linux kernel before 5.3.11, sound/core/timer.c has a use-after-free caused by erroneous code refactoring, aka CID-e7af6307a8a5. This is related to snd_timer_open and snd_timer_close_locked. The timeri variable was originally intended to be for a newly created timer instance, but was used for a different purpose after refactoring.
In the Linux kernel before 5.3.11, sound/core/timer.c has a use-after-free caused by erroneous code refactoring, aka CID-e7af6307a8a5. This is related to snd_timer_open and snd_timer_close_locked. The timeri variable was originally intended to be for a newly created timer instance, but was used for a different purpose after refactoring.
In the Linux kernel before 5.3.11, sound/core/timer.c has a use-after- ...
In the Linux kernel before 5.3.11, sound/core/timer.c has a use-after-free caused by erroneous code refactoring, aka CID-e7af6307a8a5. This is related to snd_timer_open and snd_timer_close_locked. The timeri variable was originally intended to be for a newly created timer instance, but was used for a different purpose after refactoring.
Уязвимость функций snd_timer_open и snd_timer_close_locked ядра операционной системы Linux, позволяющая нарушителю повысить свои привилегии
7.8 High
CVSS3