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high7.8

CVE-2025-38499

In the Linux kernel, the following vulnerability has been resolved: clone_private_mnt(): make sure that caller has CAP_SYS_ADMIN in the right userns What we wa…

Impact

In the Linux kernel, the following vulnerability has been resolved: clone_private_mnt(): make sure that caller has CAP_SYS_ADMIN in the right userns What we want is to verify there is that clone won't expose something hidden by a mount we wouldn't be able to undo. "Wouldn't be able to undo" may be a result of MNT_LOCKED on a child, but it may also come from lacking admin rights in the userns of the namespace mount belongs to. clone_private_mnt() checks the former, but not the latter. There's a number of rather confusing CAP_SYS_ADMIN checks in various userns during the mount, especially with the new mount API; they serve different purposes and in case of clone_private_mnt() they usually, but not always end up covering the missing check mentioned above.

Affected products

VendorProductAffected versions
LinuxLinux Kernel
from 4.4.281 before 4.5
from 4.9.280 before 4.10
from 4.14.244 before 4.15
from 4.19.204 before 4.20
from 5.4.141 before 5.5
from 5.10.59 before 5.11
DebianDebian Linux
Version 11.0

References