Improper input validation in Linux kernel - CVE-2026-64559

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Main Vulnerability Database Vulnerabilities #VU140099

Improper input validation in Linux kernel - CVE-2026-64559

Published: July 30, 2026


Vulnerability identifier: #VU140099
CSH Severity: Low
CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-64559
CWE-ID: CWE-20
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to execute arbitrary code or cause a denial of service.

The vulnerability exists due to improper input validation in the PKEY_VERIFYPROTK ioctl in drivers/s390/crypto/pkey_api.c when processing a user-supplied request structure from user space. A local user can provide a crafted buffer length value to execute arbitrary code or cause a denial of service.


Affected software

Linux kernel
Debian Linux
linux (Debian package)

How to mitigate CVE-2026-64559

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux (Debian package) - update to 6.12.100-1

External References

Related Security Bulletins