RDMA/irdma: Prevent rereg_mr for non-mem regions (CVE-2026-68419) | HOL Guard CVE

High · CVSS 7.8CVE-2026-68419

RDMA/irdma: Prevent rereg_mr for non-mem regions

Answer in brief

CVE-2026-68419 records a High severity (CVSS 7.8) vulnerability in RDMA/irdma: Prevent rereg_mr for non-mem regions. 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 Aug 10, 2026Updated Aug 17, 2026Source checked Sep 24, 2026First seen by HOL Aug 10, 2026Material review Aug 17, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.8
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 7.8. 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	>=715fdb3b30541cc8180b7cdc6aa9f8c307afdf25 <fb46d134e1b8690bed2da9005b36d32d2efd34ac \|\| >=5ac388db27c443dadfbb0b8b23fa7ccf429d901a <b5029e91c63406e4f4c8d58161048b41b6f0bd8c \|\| >=5ac388db27c443dadfbb0b8b23fa7ccf429d901a <ca1c29f05274b737dc964e28b97803750d7cf7ec \|\| >=5ac388db27c443dadfbb0b8b23fa7ccf429d901a <dbaa37e060918c45517786e37ecab0f300b48fa9 \|\| >=5ac388db27c443dadfbb0b8b23fa7ccf429d901a <a846aecb931b4d65d5eafa92a0623545af46d4f2 \|\| >=6.6.120 <6.6.148	fb46d134e1b8690bed2da9005b36d32d2efd34ac, b5029e91c63406e4f4c8d58161048b41b6f0bd8c, ca1c29f05274b737dc964e28b97803750d7cf7ec, dbaa37e060918c45517786e37ecab0f300b48fa9, a846aecb931b4d65d5eafa92a0623545af46d4f2, 6.6.148
Linux/Linuxgeneric	6.7	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to fb46d134e1b8690bed2da9005b36d32d2efd34ac if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 10, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 10, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: RDMA/irdma: Prevent rereg_mr for non-mem regions When a QP/CQ/SRQ is created, a two step process is used where the buffer is allocated in userspace and explicitly registered with the normal reg_mr mechanism prior to creating the actual QP/CQ/SRQ object. These special registrations are indicated via an ABI field so the driver knows that they do not have a valid mkey and to skip the actual CQP command submission. Since these are real MR objects from the core's perspective, it is possible for a user application to invoke rereg_mr on them and cause a real CQP op to be emitted with the zero-initialized mkey value of 0. Fix this by preventing rereg_mr on these special regions.

Quoted source text, attributed separately from HOL analysis.