CVE-2026-74297

Kernel memory corruption via unchecked RQ shift

Published Aug 15, 2026 · Updated Aug 15, 2026

Integer overflow in the Linux kernel RDMA/mlx5 subsystem allows local users to crash the host through a crafted RQ WQE shift. The set_rq_size() function accepts rq_wqe_shift values of 31 or 32, then evaluates a signed 1-bit shift that overflows or has an invalid shift count. Access to an mlx5 RDMA device and its uverbs interface is required; inconsistent queue sizing allows memory corruption or a kernel panic.

CVSS severity7.8
High
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

Integer overflow in the Linux kernel RDMA/mlx5 subsystem allows local users to crash the host through a crafted RQ WQE shift. The set_rq_size() function accepts rq_wqe_shift values of 31 or 32, then evaluates a signed 1-bit shift that overflows or has an invalid shift count. Access to an mlx5 RDMA device and its uverbs interface is required; inconsistent queue sizing allows memory corruption or a kernel panic.

The record

CVE
CVE-2026-74297
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-1335, 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=3.11
  2. Affected versionversion=e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c <42f3d2c8c18b92ea33e506a38b64f1a8986c2823
  3. Affected versionversion=e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c <4b87a2497276a72fd63028e7419abf0fb7ed837b
  4. Affected versionversion=e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c <6fc874fdfb366bfb11c62e6af9a831c8be59ddda
  5. Affected versionversion=e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c <9fff54929cc00849d738faa99f06c32399aeb026
  6. Affected versionversion=e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c <b732db02a2b04cde393638df19de6251ce62a74e
  7. Affected versionversion=e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c <b746f949c2ac2b041102836095d6d4a2ef21fa75
  8. Affected versionversion=e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c <c1dbf52d24a8cb1aa56780ba51b72e7d495f258c
  9. Affected versionversion=e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c <d881d60223aac8fdc12b227d89c76e131e92a9cd

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.11; version=e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c <42f3d2c8c18b92ea33e506a38b64f1a8986c2823; version=e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c <4b87a2497276a72fd63028e7419abf0fb7ed837b; version=e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c <6fc874fdfb366bfb11c62e6af9a831c8be59ddda; version=e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c <9fff54929cc00849d738faa99f06c32399aeb026; version=e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c <b732db02a2b04cde393638df19de6251ce62a74e; version=e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c <b746f949c2ac2b041102836095d6d4a2ef21fa75; version=e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c <c1dbf52d24a8cb1aa56780ba51b72e7d495f258c; version=e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c <d881d60223aac8fdc12b227d89c76e131e92a9cd

Published CVSS scores

7.8Linux CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5Red HatCVSS: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

CWE-1335Incorrect Bitwise Shift of Integer
T1499Endpoint Denial of Service

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

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Your stack

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