CVE-2021-47470 mm, slub: fix potential use-after-free in slab_debugfs_fops
A use-after-free vulnerability in the Linux kernel's SLUB allocator debugfs interface allows attackers to potentially execute code or escalate privileges.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-47470?
CVE-2021-47470 is a high-severity use after free vulnerability in Linux kernel, published on 22 May 2024. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
mm, slub: fix potential use-after-free in slab_debugfs_fops
When sysfs_slab_add failed, we shouldn't call debugfs_slab_add() for s because s will be freed soon. And slab_debugfs_fops will use s later leading to a use-after-free.
Weakness: CWE-416
Which versions are affected by CVE-2021-47470?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2021-47470?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2021-47470 being exploited?
There is no known exploitation of CVE-2021-47470 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2021-47470, GHSA-vr9g-qp6c-282r, UBUNTU-CVE-2021-47470.