CVE-2026-31484

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> io_uring/fdinfo: fix OOB read in SQE_MIXED wrap check<br /> <br /> __io_uring_show_fdinfo() iterates over pending SQEs and, for 128-byte<br /> SQEs on an IORING_SETUP_SQE_MIXED ring, needs to detect when the second<br /> half of the SQE would be past the end of the sq_sqes array. The current<br /> check tests (++sq_head &amp; sq_mask) == 0, but sq_head is only incremented<br /> when a 128-byte SQE is encountered, not on every iteration. The actual<br /> array index is sq_idx = (i + sq_head) &amp; sq_mask, which can be sq_mask<br /> (the last slot) while the wrap check passes.<br /> <br /> Fix by checking sq_idx directly. Keep the sq_head increment so the loop<br /> still skips the second half of the 128-byte SQE on the next iteration.