RDMA/ionic: Embed counter driver data in rdma_counter allocation (CVE-2026-89509) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-89509

RDMA/ionic: Embed counter driver data in rdma_counter allocation

Answer in brief

CVE-2026-89509 records a Unknown severity vulnerability in RDMA/ionic: Embed counter driver data in rdma_counter allocation. 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	>=ea4c399642b85dc30f44d90ee805c6a18fa03062 <c98197ee3cd28288da13dc9881bb9e74daa7cbbc \|\| >=ea4c399642b85dc30f44d90ee805c6a18fa03062 <08b8630b557828aedb1d9ef0a6e2ec421f334ee2 \|\| >=ea4c399642b85dc30f44d90ee805c6a18fa03062 <cf3ebd89e754015625fee90aa938f6bc79a2c974	c98197ee3cd28288da13dc9881bb9e74daa7cbbc, 08b8630b557828aedb1d9ef0a6e2ec421f334ee2, cf3ebd89e754015625fee90aa938f6bc79a2c974
Linux/Linuxgeneric	6.18	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to c98197ee3cd28288da13dc9881bb9e74daa7cbbc 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/ionic: Embed counter driver data in rdma_counter allocation Commit 7e53b31acc7f ("RDMA/core: Create and destroy rdma_counter using rdma_zalloc_drv_obj()") requires drivers implementing counter ops to embed struct rdma_counter in a driver-specific struct, register its size via INIT_RDMA_OBJ_SIZE, and provide a counter_init callback. The ionic driver was merged without this adaptation, causing a NULL pointer dereference in alloc_and_bind() since rdma_zalloc_drv_obj() allocates zero bytes when size_rdma_counter is unset. Consolidate struct ionic_counter into a new struct ionic_rdma_counter that embeds struct rdma_counter, replace the xarray with a lightweight ida for ID allocation, and add the required counter_init and INIT_RDMA_OBJ_SIZE declarations.

Quoted source text, attributed separately from HOL analysis.