CVE-2026-43120
Description
AI Translation Available
In the Linux kernel, the following vulnerability has been resolved:
RDMA/irdma: Fix double free related to rereg_user_mr
If IB_MR_REREG_TRANS is set during rereg_user_mr, the
umem will be released and a new one will be allocated
in irdma_rereg_mr_trans. If any step of irdma_rereg_mr_trans
fails after the new umem is allocated, it releases the umem,
but does not set iwmr->region to NULL. The problem is that
this failure is propagated to the user, who will then call
ibv_dereg_mr (as they should). Then, the dereg_mr path will
see a non-NULL umem and attempt to call ib_umem_release again.
Fix this by setting iwmr->region to NULL after ib_umem_release.
Fixed: 5ac388db27c4 ('RDMA/irdma: Add support to re-register a memory region')
https://git.kernel.org/stable/c/0c5d70bcb9d2275a1c8515a924016fcfeb4ab441
https://git.kernel.org/stable/c/0f22c32141acdcda266b26cab2b830baf870f3e0
https://git.kernel.org/stable/c/29a3edd7004bb635d299fb9bc6f0ea4ef13ed5a2
https://git.kernel.org/stable/c/62298a48f8b8788ad8b8464e6ffdf1ddebd2217e
https://git.kernel.org/stable/c/66964118f1f50ed85001c8fc9f7ab5bbdd021ee0