Описание
Systems with microprocessors utilizing speculative execution and branch prediction may allow unauthorized disclosure of information to an attacker with local user access via a speculative buffer overflow and side-channel analysis.
An industry-wide issue was found in the way many modern microprocessor designs have implemented speculative execution of instructions past bounds check. The flaw relies on the presence of a precisely-defined instruction sequence in the privileged code and the fact that memory writes occur to an address which depends on the untrusted value. Such writes cause an update into the microprocessor's data cache even for speculatively executed instructions that never actually commit (retire). As a result, an unprivileged attacker could use this flaw to influence speculative execution and/or read privileged memory by conducting targeted cache side-channel attacks.
Отчет
This issue affects the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 5, 6, 7 and Red Hat Enterprise MRG 2. Future kernel updates for Red Hat Enterprise Linux 5, 6, 7 and Red Hat Enterprise MRG 2 may address this issue.
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| Red Hat Enterprise Linux 5 | kernel | Affected | ||
| Red Hat Enterprise Linux 8 | kernel | Not affected | ||
| Red Hat Enterprise MRG 2 | kernel-rt | Affected | ||
| Red Hat Enterprise Linux 6 | kernel | Fixed | RHSA-2018:2390 | 14.08.2018 |
| Red Hat Enterprise Linux 7 | kernel-rt | Fixed | RHSA-2018:2395 | 14.08.2018 |
| Red Hat Enterprise Linux 7 | kernel | Fixed | RHSA-2018:2384 | 14.08.2018 |
| Red Hat Enterprise Linux 7 | kernel-alt | Fixed | RHSA-2020:0174 | 21.01.2020 |
| Red Hat Enterprise Linux 7.4 Extended Update Support | kernel | Fixed | RHSA-2019:1946 | 30.07.2019 |
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Дополнительная информация
Статус:
EPSS
5.9 Medium
CVSS3
Связанные уязвимости
Systems with microprocessors utilizing speculative execution and branch prediction may allow unauthorized disclosure of information to an attacker with local user access via a speculative buffer overflow and side-channel analysis.
Systems with microprocessors utilizing speculative execution and branch prediction may allow unauthorized disclosure of information to an attacker with local user access via a speculative buffer overflow and side-channel analysis.
Systems with microprocessors utilizing speculative execution and branc ...
Systems with microprocessors utilizing speculative execution and branch prediction may allow unauthorized disclosure of information to an attacker with local user access via a speculative buffer overflow and side-channel analysis.
Уязвимость процессоров Intel, ARM и AMD, связанная с особенностями функционирования модуля прогнозирования ветвлений, позволяющая нарушителю раскрыть защищаемую информацию
EPSS
5.9 Medium
CVSS3