SB20260425122 - Integer overflow in Linux kernel kvm svm

Description

This security bulletin contains information about 1 vulnerability.

1) Integer overflow (CVE-ID: CVE-2026-31590)

CWE-ID: CWE-190 - Integer overflow

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper handling of an integer overflow condition in sev_pin_memory() when processing a KVM_MEMORY_ENCRYPT_REG_REGION ioctl request with a crafted size value. A local user can submit a specially crafted ioctl request to cause a kernel warning.

The issue is reachable from userspace through the KVM SEV memory encryption region registration interface.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/1cba4dcd795daf6d257122779fb6a349edf03914
• https://git.kernel.org/stable/c/28cc13ca20431b127d42d84ba10898d03e2c8267
• https://git.kernel.org/stable/c/ab423e5892826202a660b5ac85d1125b0e8301a5
• https://git.kernel.org/stable/c/c29ff288a2d97a6f4640a498a367cf0eb91312eb