RDMA/uverbs: Add UVERBS_ATTR_UHW to UVERBS_METHOD_REG_MR (CVE-2026-89506) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-89506

RDMA/uverbs: Add UVERBS_ATTR_UHW to UVERBS_METHOD_REG_MR

Answer in brief

CVE-2026-89506 records a Unknown severity vulnerability in RDMA/uverbs: Add UVERBS_ATTR_UHW to UVERBS_METHOD_REG_MR. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 11, 2026Updated Sep 11, 2026Source checked Sep 11, 2026First seen by HOL Sep 11, 2026Material review Sep 11, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=5b2e45049dc06a876bc6b138218ddeb0814502ef <71d5c41ac583df09a7c32199bef7d42de7267d07 \|\| >=5b2e45049dc06a876bc6b138218ddeb0814502ef <9e71d0f4944ba5641e01db29b3256c963656d671 \|\| >=5b2e45049dc06a876bc6b138218ddeb0814502ef <011199f46f44a9fd93a9e5ab5d7fd1328d80e9bf	71d5c41ac583df09a7c32199bef7d42de7267d07, 9e71d0f4944ba5641e01db29b3256c963656d671, 011199f46f44a9fd93a9e5ab5d7fd1328d80e9bf
Linux/Linuxgeneric	6.17	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 71d5c41ac583df09a7c32199bef7d42de7267d07 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 11, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.