CVE-2026-97617
UnknownSummary
In the Linux kernel, the ring_buffer_subbuf_order_set() function stores the new order and only then checks CPUs, returning -EBUSY if any has resizing disabled. A user-mapped buffer has resizing disabled, and __rb_map_vma() reads buffer->subbuf_order without the mutex, so an mmap racing the failing order change can size the mapping incorrectly.
Risk Assessment
This can lead to memory corruption or kernel crash due to a race during mmap. It requires local access to ring-buffer interfaces.
Recommendation
Update the Linux kernel to a version with the fix that checks CPUs before storing the new order. Avoid concurrent mmap and buffer resize operations.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: ring-buffer: Check resize_disabled before publishing the new subbuf order ring_buffer_subbuf_order_set() stores the new order and only then walks the CPUs, returning -EBUSY if any of them has resizing disabled. A user mapped buffer has resizing disabled, and __rb_map_vma() reads buffer->subbuf_order without buffer->mutex, so an mmap of an already mapped CPU racing the failing order change sizes the mapping with the new order and inserts pages past the sub-buffer into the VMA. Check the CPUs before storing the new order.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS