CVE-2024-47668 lib/generic-radix-tree.c: Fix rare race in __genradix_ptr_alloc()
A race condition in the Linux kernel's generic radix tree allows attackers to read or modify stale memory pointers, potentially leading to data corruption or information disclosure.
- 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-2024-47668?
CVE-2024-47668 is a high-severity vulnerability in Linux kernel, published on 9 Oct 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:
lib/generic-radix-tree.c: Fix rare race in __genradix_ptr_alloc()
If we need to increase the tree depth, allocate a new node, and then race with another thread that increased the tree depth before us, we'll still have a preallocated node that might be used later.
If we then use that node for a new non-root node, it'll still have a pointer to the old root instead of being zeroed - fix this by zeroing it in the cmpxchg failure path.
Weakness: CWE-362
Which versions are affected by CVE-2024-47668?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-47668?
Apply the vendor's patch.
Is CVE-2024-47668 being exploited?
There is no known exploitation of CVE-2024-47668 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2024-47668, DEBIAN-CVE-2024-47668, GHSA-r4v9-v8c5-298p, ROOT-OS-DEBIAN-11-CVE-2024-47668, UBUNTU-CVE-2024-47668.