Riskcovery

CVE-2026-89506

RDMA/uverbs: Add UVERBS_ATTR_UHW to UVERBS_METHOD_REG_MR

State
Published
Severity
Not scored
Published
Sep 11, 2026
Updated
Oct 19, 2026
Reserved
Sep 11, 2026

Read the record on cve.org

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 5b2e45049dc06a876bc6b138218ddeb0814502ef to before 71d5c41ac583df09a7c32199bef7d42de7267d07Affected
  • 5b2e45049dc06a876bc6b138218ddeb0814502ef to before 9e71d0f4944ba5641e01db29b3256c963656d671Affected
  • 5b2e45049dc06a876bc6b138218ddeb0814502ef to before 011199f46f44a9fd93a9e5ab5d7fd1328d80e9bfAffected
LinuxLinux
  • 6.17Affected
  • before 6.17Not affected
  • 6.18.50 through 6.18.*Not affected
  • 7.2.4 through 7.2.*Not affected
  • 7.3 and laterNot affected

References

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