CVE-2026-68419

Summary

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

RDMA/irdma: Prevent rereg_mr for non-mem regions

When a QP/CQ/SRQ is created, a two step process is used where the buffer is allocated in userspace and explicitly registered with the normal reg_mr mechanism prior to creating the actual QP/CQ/SRQ object.

These special registrations are indicated via an ABI field so the driver knows that they do not have a valid mkey and to skip the actual CQP command submission.

Since these are real MR objects from the core's perspective, it is possible for a user application to invoke rereg_mr on them and cause a real CQP op to be emitted with the zero-initialized mkey value of 0.

Fix this by preventing rereg_mr on these special regions.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux715fdb3b30541cc8180b7cdc6aa9f8c307afdf25 < fb46d134e1b8690bed2da9005b36d32d2efd34acaffected
LinuxLinux5ac388db27c443dadfbb0b8b23fa7ccf429d901a < b5029e91c63406e4f4c8d58161048b41b6f0bd8caffected
LinuxLinux5ac388db27c443dadfbb0b8b23fa7ccf429d901a < ca1c29f05274b737dc964e28b97803750d7cf7ecaffected
LinuxLinux5ac388db27c443dadfbb0b8b23fa7ccf429d901a < dbaa37e060918c45517786e37ecab0f300b48fa9affected
LinuxLinux5ac388db27c443dadfbb0b8b23fa7ccf429d901a < a846aecb931b4d65d5eafa92a0623545af46d4f2affected
LinuxLinux6.6.120 < 6.6.148affected
LinuxLinux6.7affected
LinuxLinux0 < 6.7unaffected
LinuxLinux6.6.148 <= 6.6.*unaffected
LinuxLinux6.12.101 <= 6.12.*unaffected
LinuxLinux6.18.42 <= 6.18.*unaffected
LinuxLinux7.1.6 <= 7.1.*unaffected
LinuxLinux7.2-rc4 <= *unaffected

Weaknesses

References