UNKNOWN NVD
CVE-2026-89503
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_r
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it can allocate a reader page with an outdated order.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.
References
- https://git.kernel.org/stable/c/2dc510957fe8fd098ab3c3147ebdf34d00cd2734
- https://git.kernel.org/stable/c/53106e9262a310ef2c9a9321168c03705940c678
- https://git.kernel.org/stable/c/e743527c5bfdceda1095bc0a9e596e2aebb6a9c3
This unknown severity vulnerability was published on 2026-09-11 via NVD.
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