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CVE-2025-38499 The advisory has been revoked - it doesn't affect any version of package kernel-64k-devel-matched  (opens in a new tab)

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EPSS
0.15% (6th percentile)

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  • Snyk IDSNYK-ALMALINUX10-KERNEL64KDEVELMATCHED-14872020
  • published6 Jan 2026
  • disclosed16 Dec 2025
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Introduced: 16 Dec 2025

CVE-2025-38499  (opens in a new tab)

Amendment

The AlmaLinux security team deemed this advisory irrelevant for AlmaLinux:10.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-64k-devel-matched package and not the kernel-64k-devel-matched package as distributed by AlmaLinux.

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.

References