Backport privilege escalation security fix for CVE-2025-39698 from linux 6.12.44 #416
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commit 508c131 upstream. The io_futex_data is allocated upfront and assigned to the io_kiocb async_data field, but the request isn't marked with REQ_F_ASYNC_DATA at that point. Those two should always go together, as the flag tells io_uring whether the field is valid or not. Additionally, on failure cleanup, the futex handler frees the data but does not clear ->async_data. Clear the data and the flag in the error path as well. Thanks to Trend Micro Zero Day Initiative and particularly ReDress for reporting this. Cc: stable@vger.kernel.org Fixes: 194bb58 ("io_uring: add support for futex wake and wait") Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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CVE link
Linux upstream commits:
d9f9317
d34c041
508c131
CVE announce
This pr tested on pmbootstrap compiling, and wileyfox swift booting up