CVE-2025-38499 - Linux Kernel Clone Private Mnt userns Privilege Escalation Vulnerability

CVE-2025-38499 - Linux Kernel Clone Private Mnt userns Privilege Escalation Vulnerability

https://cvefeed.io/rssfeed/latest.atom / Mon, 08/11/2025 - 20:34
CVE ID : CVE-2025-38499
Published : Aug. 11, 2025, 4:15 p.m. | 25 minutes ago
Description : 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.
Severity: 0.0 | NA
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