Описание
util-linux versions through 2.41.5 and 2.42.2 fail to check mount helper exit status before running post-mount hooks, allowing unprivileged users to execute privileged operations on pre-existing filesystems. Attackers can exploit X-mount.idmap or X-mount.owner hooks to clone filesystems with inherited suid bits or modify target inode permissions after a helper fails, achieving privilege escalation.
When an external mount. helper runs but exits with a nonzero status, libmount still treats the helper invocation as successful and runs privileged post-mount hooks. A local unprivileged user with an /etc/fstab entry that uses the user option together with X-mount.idmap or X-mount.owner/group/mode can cause those hooks to clone or re-own the underlying filesystem after the helper fails, leading to local privilege escalation.
Отчет
Affected versions: util-linux v2.39 through v2.42.2. Fixed in v2.41.6 and v2.42.3.
Меры по смягчению последствий
Upgrade to util-linux v2.41.6, v2.42.3, or later. Until a fix is applied, avoid combining the user (or users) fstab option with X-mount.idmap or X-mount.owner/group/mode on entries that invoke an external mount. helper. Administrators can also remove or restrict user-mountable fstab entries that specify those X-mount.* options.
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| Red Hat Enterprise Linux 10 | util-linux | Affected | ||
| Red Hat Enterprise Linux 7 | util-linux | Not affected | ||
| Red Hat Enterprise Linux 8 | util-linux | Not affected | ||
| Red Hat Enterprise Linux 9 | rhel8/flatpak-runtime | Not affected | ||
| Red Hat Enterprise Linux 9 | rhel8/flatpak-sdk | Not affected | ||
| Red Hat Enterprise Linux 9 | util-linux | Not affected | ||
| Red Hat OpenShift Container Platform 4 | rhcos | Not affected | ||
| Red Hat Hardened Images | util-linux-main-2.42.2-3.4.hum1 | Fixed | RHSA-2026:63162 | 03.09.2026 |
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Дополнительная информация
Статус:
7.8 High
CVSS3
Связанные уязвимости
util-linux versions through 2.41.5 and 2.42.2 fail to check mount helper exit status before running post-mount hooks, allowing unprivileged users to execute privileged operations on pre-existing filesystems. Attackers can exploit X-mount.idmap or X-mount.owner hooks to clone filesystems with inherited suid bits or modify target inode permissions after a helper fails, achieving privilege escalation.
util-linux versions through 2.41.5 and 2.42.2 fail to check mount helper exit status before running post-mount hooks, allowing unprivileged users to execute privileged operations on pre-existing filesystems. Attackers can exploit X-mount.idmap or X-mount.owner hooks to clone filesystems with inherited suid bits or modify target inode permissions after a helper fails, achieving privilege escalation.
util-linux versions through 2.41.5 and 2.42.2 fail to check mount help ...
Уязвимость пакета служебных утилит командной строки Util-linux, связанная с недостатками обработки ошибочных ситуаций, позволяющая нарушителю повысить свои привилегии
7.8 High
CVSS3