AZL-73470
See a problem?- Import Source
- https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-73470.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/AZL-73470
- Upstream
- Published
- 2025-08-11T16:15:30Z
- Modified
- 2026-04-01T05:22:17.526367Z
- Summary
- CVE-2025-38499 affecting package kernel for versions less than 5.15.200.1-1
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
cloneprivatemnt(): make sure that caller has CAPSYSADMIN 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.
cloneprivatemnt() checks the former, but not the latter.
There's a number of rather confusing CAPSYSADMIN checks in various userns during the mount, especially with the new mount API; they serve different purposes and in case of cloneprivatemnt() they usually, but not always end up covering the missing check mentioned above.
- References