RDMA/mlx5: Fix UMR XLT cleanup on ODP populate failure (CVE-2026-74396) | HOL Guard CVE

High · CVSS 7.5CVE-2026-74396

RDMA/mlx5: Fix UMR XLT cleanup on ODP populate failure

Answer in brief

CVE-2026-74396 records a High severity (CVSS 7.5) vulnerability in RDMA/mlx5: Fix UMR XLT cleanup on ODP populate failure. 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 15, 2026Updated Aug 17, 2026Source checked Sep 29, 2026First seen by HOL Aug 15, 2026Material review Aug 17, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.5
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 7.5. 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	>=1efe8c0670d6a6883faa09c9abc746c741f5664a <ffa85a2c197935ace6f1634ad9eb0a44bc615670 \|\| >=1efe8c0670d6a6883faa09c9abc746c741f5664a <9619909d4869afe720904c6888a289b9ac3055b8 \|\| >=1efe8c0670d6a6883faa09c9abc746c741f5664a <1eae35b37923cb71b0cb5136d00671440d488b9f	ffa85a2c197935ace6f1634ad9eb0a44bc615670, 9619909d4869afe720904c6888a289b9ac3055b8, 1eae35b37923cb71b0cb5136d00671440d488b9f
Linux/Linuxgeneric	6.16	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to ffa85a2c197935ace6f1634ad9eb0a44bc615670 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 15, 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 15, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: RDMA/mlx5: Fix UMR XLT cleanup on ODP populate failure mlx5r_umr_update_xlt() allocates and DMA maps an XLT buffer with mlx5r_umr_create_xlt(). The buffer is released by the common cleanup path through mlx5r_umr_unmap_free_xlt(). After mlx5_odp_populate_xlt() became fallible, its error path returned directly and skipped that cleanup. This leaks the XLT DMA mapping and buffer. If the emergency XLT page was used, it also leaves xlt_emergency_page_mutex locked. Break out of the loop so execution falls through the existing cleanup path.

Quoted source text, attributed separately from HOL analysis.