Описание
An issue was discovered in the Linux kernel before 5.2.6. On NUMA systems, the Linux fair scheduler has a use-after-free in show_numa_stats() because NUMA fault statistics are inappropriately freed, aka CID-16d51a590a8c.
A flaw was found in the Linux kernel’s implementation of displaying NUMA statistics, where displaying the scheduler statistics could trigger a use-after-free in show_numa_stats() and display the kernel memory to userspace. The highest threat from this vulnerability is to system availability.
Меры по смягчению последствий
As the NUMA features are built-in and enabled by default, the NUMA functionality can be disabled at boot time by providing the kernel parameter, numa=off. The method of providing this parameter depends on the operating system version, see KCS article https://access.redhat.com/solutions/23216. Disabling this feature may have significant performance impacts and the administrator should consider if the performance penalty is a problem. If you need further assistance, see KCS article https://access.redhat.com/solutions/41278 or contact Red Hat Global Support Services.
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| Red Hat Enterprise Linux 5 | kernel | Out of support scope | ||
| Red Hat Enterprise Linux 6 | kernel | Out of support scope | ||
| Red Hat Enterprise Linux 7 | kernel-alt | Will not fix | ||
| Red Hat Enterprise Linux 8 | kernel | Not affected | ||
| Red Hat Enterprise Linux 8 | kernel-rt | Not affected | ||
| Red Hat Enterprise Linux 7 | kernel-rt | Fixed | RHSA-2021:2726 | 21.07.2021 |
| Red Hat Enterprise Linux 7 | kernel | Fixed | RHSA-2021:2725 | 21.07.2021 |
| Red Hat Enterprise Linux 7.7 Advanced Update Support | kernel | Fixed | RHSA-2021:3987 | 26.10.2021 |
| Red Hat Enterprise Linux 7.7 Telco Extended Update Support | kernel | Fixed | RHSA-2021:3987 | 26.10.2021 |
| Red Hat Enterprise Linux 7.7 Update Services for SAP Solutions | kernel | Fixed | RHSA-2021:3987 | 26.10.2021 |
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Дополнительная информация
Статус:
5.3 Medium
CVSS3
Связанные уязвимости
An issue was discovered in the Linux kernel before 5.2.6. On NUMA systems, the Linux fair scheduler has a use-after-free in show_numa_stats() because NUMA fault statistics are inappropriately freed, aka CID-16d51a590a8c.
An issue was discovered in the Linux kernel before 5.2.6. On NUMA systems, the Linux fair scheduler has a use-after-free in show_numa_stats() because NUMA fault statistics are inappropriately freed, aka CID-16d51a590a8c.
An issue was discovered in the Linux kernel before 5.2.6. On NUMA syst ...
An issue was discovered in the Linux kernel before 5.2.6. On NUMA systems, the Linux fair scheduler has a use-after-free in show_numa_stats() because NUMA fault statistics are inappropriately freed, aka CID-16d51a590a8c.
Уязвимость функции show_numa_stats() системы NUMA ядра операционных систем Linux, позволяющая нарушителю вызвать отказ в обслуживании
5.3 Medium
CVSS3