CVE-2024-50207 ring-buffer: Fix reader locking when changing the sub buffer order
A race condition in the Linux kernel ring buffer allows concurrent access to modified data, potentially causing system crashes.
- 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-2024-50207?
CVE-2024-50207 is a high-severity vulnerability in Linux kernel, published on 8 Nov 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:
ring-buffer: Fix reader locking when changing the sub buffer order
The function ring_buffer_subbuf_order_set() updates each ring_buffer_per_cpu and installs new sub buffers that match the requested page order. This operation may be invoked concurrently with readers that rely on some of the modified data, such as the head bit (RB_PAGE_HEAD), or the ring_buffer_per_cpu.pages and reader_page pointers. However, no exclusive access is acquired by ring_buffer_subbuf_order_set(). Modifying the mentioned data while a reader also operates on them can then result in incorrect memory access and various crashes.
Fix the problem by taking the reader_lock when updating a specific ring_buffer_per_cpu in ring_buffer_subbuf_order_set().
Weakness: CWE-667
Which versions are affected by CVE-2024-50207?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-50207?
Apply the vendor's patch.
Is CVE-2024-50207 being exploited?
There is no known exploitation of CVE-2024-50207 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2024-50207, DEBIAN-CVE-2024-50207, GHSA-6h6f-84wv-5rqq, UBUNTU-CVE-2024-50207.