CVE-2024-50207: ring-buffer: Fix reader locking when changing the sub buffer order
First published: Fri Nov 08 2024(Updated: )
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().
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=6.8<6.11.6 | |
| Linux Kernel | =6.12-rc1 | |
| Linux Kernel | =6.12-rc2 | |
| Linux Kernel | =6.12-rc3 |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2024-50207?
CVE-2024-50207 has not been assigned a CVSS score yet, indicating its impact is still being assessed.
How do I fix CVE-2024-50207?
To fix CVE-2024-50207, update your Linux kernel to version 6.11.6 or above.
Which versions of the Linux kernel are affected by CVE-2024-50207?
CVE-2024-50207 affects Linux kernel versions between 6.8 and 6.11.6, as well as 6.12-rc1, 6.12-rc2, and 6.12-rc3.
Is there a workaround for CVE-2024-50207?
Currently, there are no known workarounds for CVE-2024-50207 other than updating the kernel.
What specific component of the Linux kernel is impacted by CVE-2024-50207?
CVE-2024-50207 impacts the ring-buffer functionality related to reader locking during sub buffer order changes.
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