CVE-2026-74390

In the Linux kernel, the following vulnerability has been resolved:

RDMA/irdma: Fix out-of-bounds write in irdma_copy_user_pgaddrs

The irdma_copy_user_pgaddrs function loops through all of the umem DMA

blocks to populate the PBLEs and will stop when either the last DMA

block is reached or palloc->total_cnt is reached. The issue is that

the logic for checking palloc->total_cnt would only work for non-zero

values.

When irdma_setup_pbles is called with lvl==0, it

calls irdma_copy_user_pgaddrs with palloc->total_cnt==0, which means

the only way to break out of the loop is to reach the last umem DMA

block, which means it could end up going beyond the fixed size of 4

iwmr->pgaddrmem array that is used in the lvl==0 case.

In the case of QP/CQ/SRQ rings, the value of lvl is determined by a

separate input (for example, req.cq_pages in the case of a CQ). So,

we must perform explicit checking to ensure we don't overflow the

pgaddrmem array if the user provides a umem that consists of more

blocks than their provided req.cq_pages.