Описание
The filesystem layer in the Linux kernel before 4.5.5 proceeds with post-rename operations after an OverlayFS file is renamed to a self-hardlink, which allows local users to cause a denial of service (system crash) via a rename system call, related to fs/namei.c and fs/open.c.
A flaw was found that the vfs_rename() function did not detect hard links on overlayfs. A local, unprivileged user could use the rename syscall on overlayfs on top of xfs to crash the system.
Отчет
This issue is not present in the Linux kernel packages as shipped with Red Hat Enterprise Linux versions 5 and 6. This issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 7 and MRG-2. Future Linux kernel updates for the respective releases may address this issue.
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 MRG 2 | realtime-kernel | Affected | ||
| Red Hat Enterprise Linux 7 | kernel-rt | Fixed | RHSA-2016:1875 | 15.09.2016 |
| Red Hat Enterprise Linux 7 | kernel-rt | Fixed | RHSA-2016:2584 | 03.11.2016 |
| Red Hat Enterprise Linux 7 | kernel | Fixed | RHSA-2016:1847 | 15.09.2016 |
| Red Hat Enterprise Linux 7 | kernel | Fixed | RHSA-2016:2574 | 03.11.2016 |
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Дополнительная информация
Статус:
EPSS
5.5 Medium
CVSS3
4.7 Medium
CVSS2
Связанные уязвимости
The filesystem layer in the Linux kernel before 4.5.5 proceeds with post-rename operations after an OverlayFS file is renamed to a self-hardlink, which allows local users to cause a denial of service (system crash) via a rename system call, related to fs/namei.c and fs/open.c.
The filesystem layer in the Linux kernel before 4.5.5 proceeds with post-rename operations after an OverlayFS file is renamed to a self-hardlink, which allows local users to cause a denial of service (system crash) via a rename system call, related to fs/namei.c and fs/open.c.
The filesystem layer in the Linux kernel before 4.5.5 proceeds with po ...
The filesystem layer in the Linux kernel before 4.5.5 proceeds with post-rename operations after an OverlayFS file is renamed to a self-hardlink, which allows local users to cause a denial of service (system crash) via a rename system call, related to fs/namei.c and fs/open.c.
EPSS
5.5 Medium
CVSS3
4.7 Medium
CVSS2