CVE-2026-43120

Summary

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")

Affected Software

VendorProductVersion RangeStatus
LinuxLinux715fdb3b30541cc8180b7cdc6aa9f8c307afdf25 < 62298a48f8b8788ad8b8464e6ffdf1ddebd2217eaffected
LinuxLinux5ac388db27c443dadfbb0b8b23fa7ccf429d901a < 66964118f1f50ed85001c8fc9f7ab5bbdd021ee0affected
LinuxLinux5ac388db27c443dadfbb0b8b23fa7ccf429d901a < 0f22c32141acdcda266b26cab2b830baf870f3e0affected
LinuxLinux5ac388db27c443dadfbb0b8b23fa7ccf429d901a < 0c5d70bcb9d2275a1c8515a924016fcfeb4ab441affected
LinuxLinux5ac388db27c443dadfbb0b8b23fa7ccf429d901a < 29a3edd7004bb635d299fb9bc6f0ea4ef13ed5a2affected
LinuxLinux6.6.120 < 6.6.136affected
LinuxLinux6.7affected
LinuxLinux0 < 6.7unaffected
LinuxLinux6.6.136 <= 6.6.*unaffected
LinuxLinux6.12.83 <= 6.12.*unaffected
LinuxLinux6.18.24 <= 6.18.*unaffected
LinuxLinux6.19.14 <= 6.19.*unaffected
LinuxLinux7.0 <= *unaffected

Weaknesses

References