CVE-2026-68419 is a vulnerability in Linux Kernel
Published on August 10, 2026
RDMA/irdma: Prevent rereg_mr for non-mem regions
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.
Products Associated with CVE-2026-68419
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Affected Versions
Linux:- Version 715fdb3b30541cc8180b7cdc6aa9f8c307afdf25 and below fb46d134e1b8690bed2da9005b36d32d2efd34ac is affected.
- Version 5ac388db27c443dadfbb0b8b23fa7ccf429d901a and below b5029e91c63406e4f4c8d58161048b41b6f0bd8c is affected.
- Version 5ac388db27c443dadfbb0b8b23fa7ccf429d901a and below ca1c29f05274b737dc964e28b97803750d7cf7ec is affected.
- Version 5ac388db27c443dadfbb0b8b23fa7ccf429d901a and below dbaa37e060918c45517786e37ecab0f300b48fa9 is affected.
- Version 5ac388db27c443dadfbb0b8b23fa7ccf429d901a and below a846aecb931b4d65d5eafa92a0623545af46d4f2 is affected.
- Version 6.6.120 and below 6.6.148 is affected.
- Version 6.7 is affected.
- Before 6.7 is unaffected.
- Version 6.6.148, <= 6.6.* is unaffected.
- Version 6.12.101, <= 6.12.* is unaffected.
- Version 6.18.42, <= 6.18.* is unaffected.
- Version 7.1.6, <= 7.1.* is unaffected.
- Version 7.2-rc4, <= * is unaffected.