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CVE-2025-38247 – “Linux Kernel User Namespace and Mnt Idmap Leak”

The following table lists the changes that have been made to the
CVE-2025-38247 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution
of a vulnerability, and for identifying the most recent changes that may
impact the vulnerability’s severity, exploitability, or other characteristics.

  • New CVE Received
    by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Jul. 09, 2025

    Action Type Old Value New Value
    Added Description In the Linux kernel, the following vulnerability has been resolved:

    userns and mnt_idmap leak in open_tree_attr(2)

    Once want_mount_setattr() has returned a positive, it does require
    finish_mount_kattr() to release ->mnt_userns. Failing do_mount_setattr()
    does not change that.

    As the result, we can end up leaking userns and possibly mnt_idmap as
    well.
    Added Reference https://git.kernel.org/stable/c/0748e553df0225754c316a92af3a77fdc057b358
    Added Reference https://git.kernel.org/stable/c/142db4e76110dd80239f4e79810f85ea1735ad60
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