CVE-2026-74346

Kernel-memory overread via CQ array misindexing

Published Aug 15, 2026 · Updated Aug 15, 2026

An out-of-bounds read in Linux kernel irdma CQ memory registration allows local users to trigger a one-element overread on GEN_2 hardware. During irdma_handle_q_mem, an unset cqmr->split flag wrongly selects the shadow-buffer path and indexes arr at req->cq_pages, which can equal the array length. Reachability requires local low-privileged access, the irdma path, and GEN_2-or-later RDMA hardware; upstream does not describe how the read value becomes observable.

CVSS severity3.3
Low
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

An out-of-bounds read in Linux kernel irdma CQ memory registration allows local users to trigger a one-element overread on GEN_2 hardware. During irdma_handle_q_mem, an unset cqmr->split flag wrongly selects the shadow-buffer path and indexes arr at req->cq_pages, which can equal the array length. Reachability requires local low-privileged access, the irdma path, and GEN_2-or-later RDMA hardware; upstream does not describe how the read value becomes observable.

The record

CVE
CVE-2026-74346
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=5.14
  2. Affected versionversion=b48c24c2d710cf34810c555dcef883a3d35a9c08 <3159c6fac43dc24b34d31971884d98a7a1bf4c4b
  3. Affected versionversion=b48c24c2d710cf34810c555dcef883a3d35a9c08 <4385ddd654d90245eeb83b3cb539670ab5c85ba4
  4. Affected versionversion=b48c24c2d710cf34810c555dcef883a3d35a9c08 <54cab78df0375196aaec4e3109191653d21751df
  5. Affected versionversion=b48c24c2d710cf34810c555dcef883a3d35a9c08 <a80b3b13786e9ab1c52b31a1f16c7d6708fa9220
  6. Affected versionversion=b48c24c2d710cf34810c555dcef883a3d35a9c08 <ad360a31092a870633ec255b96f50181628b4de0
  7. Affected versionversion=b48c24c2d710cf34810c555dcef883a3d35a9c08 <d566002de555b18cc395012c5c1cb8682fc6d2a9
  8. Affected versionversion=b48c24c2d710cf34810c555dcef883a3d35a9c08 <d5aa82da8f65562da996d184686db9d0ea718b91

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.14; version=b48c24c2d710cf34810c555dcef883a3d35a9c08 <3159c6fac43dc24b34d31971884d98a7a1bf4c4b; version=b48c24c2d710cf34810c555dcef883a3d35a9c08 <4385ddd654d90245eeb83b3cb539670ab5c85ba4; version=b48c24c2d710cf34810c555dcef883a3d35a9c08 <54cab78df0375196aaec4e3109191653d21751df; version=b48c24c2d710cf34810c555dcef883a3d35a9c08 <a80b3b13786e9ab1c52b31a1f16c7d6708fa9220; version=b48c24c2d710cf34810c555dcef883a3d35a9c08 <ad360a31092a870633ec255b96f50181628b4de0; version=b48c24c2d710cf34810c555dcef883a3d35a9c08 <d566002de555b18cc395012c5c1cb8682fc6d2a9; version=b48c24c2d710cf34810c555dcef883a3d35a9c08 <d5aa82da8f65562da996d184686db9d0ea718b91

Published CVSS scores

3.3Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo