IB/mlx5: Fix transport-domain rollback and initialize lb mutex earlier (CVE-2026-74397) | HOL Guard CVE

High · CVSS 7.8CVE-2026-74397

IB/mlx5: Fix transport-domain rollback and initialize lb mutex earlier

Answer in brief

CVE-2026-74397 records a High severity (CVSS 7.8) vulnerability in IB/mlx5: Fix transport-domain rollback and initialize lb mutex earlier. 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 7.8
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	>=146d2f1af3245a10b13eef263687e54f4e253d1d <2c3b2667dad69d56774b79db763acb3a1bee0fc0 \|\| >=146d2f1af3245a10b13eef263687e54f4e253d1d <37fc3cc0f924fd8d0f0cf87b92672dec75a32e57 \|\| >=146d2f1af3245a10b13eef263687e54f4e253d1d <65e344925fa30abf50c8de8c150b397715fa2066 \|\| >=146d2f1af3245a10b13eef263687e54f4e253d1d <f88e12c95fc19f719e06ca1e9eb20fdad68ef61a \|\| >=146d2f1af3245a10b13eef263687e54f4e253d1d <e79389115b9d27287ff6230a9750675106ed7668	2c3b2667dad69d56774b79db763acb3a1bee0fc0, 37fc3cc0f924fd8d0f0cf87b92672dec75a32e57, 65e344925fa30abf50c8de8c150b397715fa2066, f88e12c95fc19f719e06ca1e9eb20fdad68ef61a, e79389115b9d27287ff6230a9750675106ed7668
Linux/Linuxgeneric	4.5	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 2c3b2667dad69d56774b79db763acb3a1bee0fc0 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: IB/mlx5: Fix transport-domain rollback and initialize lb mutex earlier mlx5_ib_alloc_transport_domain() allocates a transport domain and then may fail in mlx5_ib_enable_lb(). In that case, the allocated TD is leaked. Fix this by deallocating the TD when mlx5_ib_enable_lb() returns an error. Also return 0 explicitly in the no-loopback-capability success branch, and move dev->lb.mutex initialization to mlx5_ib_stage_init_init().

Quoted source text, attributed separately from HOL analysis.