CVE-2026-89506
Description
In the Linux kernel, the following vulnerability has been resolved: RDMA/uverbs: Add UVERBS_ATTR_UHW to UVERBS_METHOD_REG_MR The original commit missed that three drivers (mthca, irdma, siw) have UHW data associated with reg_mr that cannot be passed through the ioctl. They also assume that the udata cannot be NULL, so failing to pass a valid udata can trigger a NULL udata crash in those drivers. This never happens in real systems since in rdma-core ibv_cmd_reg_mr_ex() does not accept a udata and those three drivers don't use it, however a malicious userspace could trigger it.
How to fix
- Linux Linux71d5c41ac583df09a7c32199bef7d42de7267d07, 9e71d0f4944ba5641e01db29b3256c963656d671, 011199f46f44a9fd93a9e5ab5d7fd1328d80e9bf or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 5b2e45049dc06a876bc6b138218ddeb0814502ef ≤ v < 71d5c41ac583df09a7c32199bef7d42de7267d07, 5b2e45049dc06a876bc6b138218ddeb0814502ef ≤ v < 9e71d0f4944ba5641e01db29b3256c963656d671, 5b2e45049dc06a876bc6b138218ddeb0814502ef ≤ v < 011199f46f44a9fd93a9e5ab5d7fd1328d80e9bf, 6.17 | 71d5c41ac583df09a7c32199bef7d42de7267d07, 9e71d0f4944ba5641e01db29b3256c963656d671, 011199f46f44a9fd93a9e5ab5d7fd1328d80e9bf |
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