CVE-2026-43366

Description

In the Linux kernel, the following vulnerability has been resolved: io_uring/kbuf: check if target buffer list is still legacy on recycle There's a gap between when the buffer was grabbed and when it potentially gets recycled, where if the list is empty, someone could've upgraded it to a ring provided type. This can happen if the request is forced via io-wq. The legacy recycling is missing checking if the buffer_list still exists, and if it's of the correct type. Add those checks.

References

• https://git.kernel.org/stable/c/439a6728ec4641ffad1ca796622c19bc525e570f
• https://git.kernel.org/stable/c/50ad880db3013c6fee0ef13781762a39e2e7ef83
• https://git.kernel.org/stable/c/97b57f69fee1b61b41acbf37e7720cac9d389fa4
• https://git.kernel.org/stable/c/a7b33671e418fca507feebd1d56e7f4952a4b25c
• https://git.kernel.org/stable/c/c2c185be5c85d37215397c8e8781abf0a69bec1f