CVE-2026-74397

Local service interruption via transport-domain leak

Published Aug 15, 2026 · Updated Aug 15, 2026

Resource leak in the mlx5 InfiniBand driver in Linux 4.5 and later allows local users to interrupt service through loopback setup failures. mlx5_ib_alloc_transport_domain() allocates a transport domain before mlx5_ib_enable_lb() and fails to release it when loopback enablement returns an error. Exploitation requires local low-privileged access and mlx5 RDMA hardware with loopback setup reaching that error path; repeated failures exhaust transport-domain resources.

CVSS severity5.5
Medium
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource leak in the mlx5 InfiniBand driver in Linux 4.5 and later allows local users to interrupt service through loopback setup failures. mlx5_ib_alloc_transport_domain() allocates a transport domain before mlx5_ib_enable_lb() and fails to release it when loopback enablement returns an error. Exploitation requires local low-privileged access and mlx5 RDMA hardware with loopback setup reaching that error path; repeated failures exhaust transport-domain resources.

The record

CVE
CVE-2026-74397
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=146d2f1af3245a10b13eef263687e54f4e253d1d <2c3b2667dad69d56774b79db763acb3a1bee0fc0
  2. Affected versionversion=146d2f1af3245a10b13eef263687e54f4e253d1d <37fc3cc0f924fd8d0f0cf87b92672dec75a32e57
  3. Affected versionversion=146d2f1af3245a10b13eef263687e54f4e253d1d <65e344925fa30abf50c8de8c150b397715fa2066
  4. Affected versionversion=146d2f1af3245a10b13eef263687e54f4e253d1d <e79389115b9d27287ff6230a9750675106ed7668
  5. Affected versionversion=146d2f1af3245a10b13eef263687e54f4e253d1d <f88e12c95fc19f719e06ca1e9eb20fdad68ef61a
  6. Affected versionversion=4.5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=146d2f1af3245a10b13eef263687e54f4e253d1d <2c3b2667dad69d56774b79db763acb3a1bee0fc0; version=146d2f1af3245a10b13eef263687e54f4e253d1d <37fc3cc0f924fd8d0f0cf87b92672dec75a32e57; version=146d2f1af3245a10b13eef263687e54f4e253d1d <65e344925fa30abf50c8de8c150b397715fa2066; version=146d2f1af3245a10b13eef263687e54f4e253d1d <e79389115b9d27287ff6230a9750675106ed7668; version=146d2f1af3245a10b13eef263687e54f4e253d1d <f88e12c95fc19f719e06ca1e9eb20fdad68ef61a; version=4.5

Published CVSS scores

5.5Oracle LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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