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CVE-2025-21836

io_uring/kbuf: reallocate buf lists on upgrade

EPSS 0.2%
In the Linux kernel, the following vulnerability has been resolved: io_uring/kbuf: reallocate buf lists on upgrade IORING_REGISTER_PBUF_RING can reuse an old struct io_buffer_list if it was created for legacy selected buffer and has been emptied. It violates the requirement that most of the field should stay stable after publish. Always reallocate it instead.
Produtos afetados
Linux · Linux

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Referências
https://git.kernel.org/stable/c/146a185f6c05ee263db715f860620606303c4633https://git.kernel.org/stable/c/2a5febbef40ce968e295a7aeaa5d5cbd9e3e5ad4https://git.kernel.org/stable/c/7d0dc28dae836caf7645fef62a10befc624dd17bhttps://git.kernel.org/stable/c/8802766324e1f5d414a81ac43365c20142e85603https://u1f383.github.io/slides/talks/2025_Hexacon-Deja_Vu_in_Linux_io_uring_Breaking_Memory_Sharing_Again_After_Generations_of_Fixes.pdf