RDMA/rxe: Fix UAF in ODP init error-handling path (CVE-2026-90423) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-90423

RDMA/rxe: Fix UAF in ODP init error-handling path

Answer in brief

CVE-2026-90423 records a Unknown severity vulnerability in RDMA/rxe: Fix UAF in ODP init error-handling path. 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 17, 2026Updated Sep 17, 2026Source checked Sep 17, 2026First seen by HOL Sep 17, 2026Material review Sep 17, 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	>=d03fb5c6599e31b90c6b5f65d43d6ccc6b49eb91 <5f1933163327c9f1c8f2a341c6cb551aaf231ff9 \|\| >=d03fb5c6599e31b90c6b5f65d43d6ccc6b49eb91 <4cfb448705da3171d44d9cbe7be53ff03284d532 \|\| >=d03fb5c6599e31b90c6b5f65d43d6ccc6b49eb91 <51f2c8d2c99fc1f452f7113c08a35edcc4bf8732	5f1933163327c9f1c8f2a341c6cb551aaf231ff9, 4cfb448705da3171d44d9cbe7be53ff03284d532, 51f2c8d2c99fc1f452f7113c08a35edcc4bf8732
Linux/Linuxgeneric	6.15	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 5f1933163327c9f1c8f2a341c6cb551aaf231ff9 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 17, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: RDMA/rxe: Fix UAF in ODP init error-handling path rxe_odp_mr_init_user() stores &umem_odp->umem in mr->umem before calling rxe_odp_init_pages(). If rxe_odp_init_pages() fails, rxe_odp_mr_init_user() releases umem_odp and returns an error. rxe_reg_user_mr() then unwinds the error through rxe_cleanup(), rxe_mr_cleanup(), ib_umem_release(mr->umem). There is an IS_ERR_OR_NULL(umem) check at the start of ib_umem_release(). But since mr->umem is NOT reset to NULL in the error handling path of rxe_odp_mr_init_user(), the check passes and it reads already-freed fields like umem->is_dmabuf, causing UAF. Fix the UAF by clearing mr->umem after releasing the failed ODP umem so the MR cleanup path does not release it again.

Quoted source text, attributed separately from HOL analysis.