CVE-2026-68419High· 7.8▾ TwilightIn 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 regi…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Oct 16.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.1%
Last analysed / modified upstream
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.
Linux >= 715fdb3b30541cc8180b7cdc6aa9f8c307afdf25 < fb46d134e1b8690bed2da9005b36d32d2efd34acLinux >= 5ac388db27c443dadfbb0b8b23fa7ccf429d901a < b5029e91c63406e4f4c8d58161048b41b6f0bd8cLinux >= 5ac388db27c443dadfbb0b8b23fa7ccf429d901a < ca1c29f05274b737dc964e28b97803750d7cf7ecLinux >= 5ac388db27c443dadfbb0b8b23fa7ccf429d901a < dbaa37e060918c45517786e37ecab0f300b48fa9Linux >= 5ac388db27c443dadfbb0b8b23fa7ccf429d901a < a846aecb931b4d65d5eafa92a0623545af46d4f2Linux >= 6.6.120 < 6.6.148Linux 6.7Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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