In the Linux kernel, the following vulnerability has been resolved:

fs: don't try and remove empty rbtree node

When copying a namespace we won't have added the new copy into the
namespace rbtree until after the copy succeeded. Calling free_mnt_ns()
will try to remove the copy from the rbtree which is invalid. Simply
free the namespace skeleton directly.

References

• https://nvd.nist.gov/vuln/detail/CVE-2024-50204
• https://git.kernel.org/stable/c/229fd15908fe1f99b1de4cde3326e62d1e892611
• https://git.kernel.org/stable/c/a8b155a2c30dc9a5ba837aa5fcba9a47cc031a9b