Information disclosure in Linux kernel - CVE-2026-74290

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Main Vulnerability Database Vulnerabilities #VU142904

Information disclosure in Linux kernel - CVE-2026-74290

Published: August 15, 2026


Vulnerability identifier: #VU142904
CSH Severity: Low
CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-74290
CWE-ID: CWE-200
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote user to disclose sensitive information.

The vulnerability exists due to improper exposure of sensitive information in the cls_flow classifier when processing class statistics for map mode rules with user-controlled mask, xor, rshift, addend, and divisor values. A remote user can create a tc classifier and observe the resulting classid through class statistics to disclose sensitive information.

Exploitation requires the ability to use a tc classifier in a user or network namespace.


Affected software

Linux kernel
Ubuntu
linux-gcp-7.0 (Ubuntu package)
linux-azure-7.0 (Ubuntu package)

How to mitigate CVE-2026-74290

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux-gcp-7.0 (Ubuntu package) - addressed in versions 7.0.0-38.38~24.04.4, 7.0.0-1013.13~24.04.1, 7.0.0-1014.14~24.04.1
linux-azure-7.0 (Ubuntu package) - addressed in versions 7.0.0-1016.16~24.04.1, 7.0.0-1017.17~24.04.1

External References

Related Security Bulletins