CVE-2026-43120

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> RDMA/irdma: Fix double free related to rereg_user_mr<br /> <br /> If IB_MR_REREG_TRANS is set during rereg_user_mr, the<br /> umem will be released and a new one will be allocated<br /> in irdma_rereg_mr_trans. If any step of irdma_rereg_mr_trans<br /> fails after the new umem is allocated, it releases the umem,<br /> but does not set iwmr-&gt;region to NULL. The problem is that<br /> this failure is propagated to the user, who will then call<br /> ibv_dereg_mr (as they should). Then, the dereg_mr path will<br /> see a non-NULL umem and attempt to call ib_umem_release again.<br /> <br /> Fix this by setting iwmr-&gt;region to NULL after ib_umem_release.<br /> <br /> Fixed: 5ac388db27c4 ("RDMA/irdma: Add support to re-register a memory region")