Описание
The __switch_to function in arch/x86/kernel/process_64.c in the Linux kernel through 3.18.1 does not ensure that Thread Local Storage (TLS) descriptors are loaded before proceeding with other steps, which makes it easier for local users to bypass the ASLR protection mechanism via a crafted application that reads a TLS base address.
An information leak flaw was found in the way the Linux kernel changed certain segment registers and thread-local storage (TLS) during a context switch. A local, unprivileged user could use this flaw to leak the user space TLS base address of an arbitrary process.
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 7 may address this issue. This issue has been rated as having Low security impact and is not currently planned to be addressed in future updates for Red Hat Enterprise Linux 5 and Red Hat Enterprise MRG 2.
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| Red Hat Enterprise Linux 5 | kernel | Will not fix | ||
| Red Hat Enterprise MRG 2 | kernel | Will not fix | ||
| Red Hat Enterprise Linux 6 | kernel | Fixed | RHSA-2015:1081 | 09.06.2015 |
| Red Hat Enterprise Linux 7 | kernel-rt | Fixed | RHSA-2015:2411 | 19.11.2015 |
| Red Hat Enterprise Linux 7 | kernel | Fixed | RHSA-2015:2152 | 19.11.2015 |
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Дополнительная информация
Статус:
EPSS
1.9 Low
CVSS2
Связанные уязвимости
The __switch_to function in arch/x86/kernel/process_64.c in the Linux kernel through 3.18.1 does not ensure that Thread Local Storage (TLS) descriptors are loaded before proceeding with other steps, which makes it easier for local users to bypass the ASLR protection mechanism via a crafted application that reads a TLS base address.
The __switch_to function in arch/x86/kernel/process_64.c in the Linux kernel through 3.18.1 does not ensure that Thread Local Storage (TLS) descriptors are loaded before proceeding with other steps, which makes it easier for local users to bypass the ASLR protection mechanism via a crafted application that reads a TLS base address.
The __switch_to function in arch/x86/kernel/process_64.c in the Linux ...
The __switch_to function in arch/x86/kernel/process_64.c in the Linux kernel through 3.18.1 does not ensure that Thread Local Storage (TLS) descriptors are loaded before proceeding with other steps, which makes it easier for local users to bypass the ASLR protection mechanism via a crafted application that reads a TLS base address.
ELSA-2015-3043: Unbreakable Enterprise kernel security update (IMPORTANT)
EPSS
1.9 Low
CVSS2