fs/namespace.c in the Linux kernel before 4.0.2 processes MNT_DETACH umount2 system calls without verifying that the MNT_LOCKED flag is unset, which allows local users to bypass intended access restrictions and navigate to filesystem locations beneath a mount by calling umount2 within a user namespace.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Jul 30, 2024 | May 2, 2016 |
| Suse | — | Upgrade kernel-obs-buildUpgrade kernel-defaultUpgrade kernel-ec2-develUpgrade kernel-docsUpgrade kernel-ec2-extraUpgrade kernel-ec2 | Jul 26, 2016 | May 2, 2016 |
| Ubuntu | — | Upgrade linux-raspi2 | Nov 19, 2024 | May 2, 2016 |
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