جزئیات آسیب‌پذیری

In the Linux kernel, the following vulnerability has been resolved: ring-buffer: Fix subbuf resize race with ring_buffer_alloc_read_page() ring_buffer_alloc_read_page() is racy with ring_buffer_subbuf_order_set, it can allocate a reader page with an outdated order. This isn't a big issue, the user can still re-allocate a new reader page and try again. However, what is more problematic is if the value of subbuf_order changes in the middle of ring_buffer_alloc_read_page(). In that case, bpage->order might not match the actual allocated memory. Use bpage->order for the allocation to prevent this race.

• https://git.kernel.org/stable/c/2313ff69bd237aad264a5913907f374f958335a2
• https://git.kernel.org/stable/c/2dc510957fe8fd098ab3c3147ebdf34d00cd2734
• https://git.kernel.org/stable/c/53106e9262a310ef2c9a9321168c03705940c678
• https://git.kernel.org/stable/c/e743527c5bfdceda1095bc0a9e596e2aebb6a9c3