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CVE-2026-63794

kernel: KVM: SVM: Fix page overflow in sev_dbg_crypt() for ENCRYPT path

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Severity

Moderate

Red Hat Product Security

7

CVSS 3.1

Review impact separately from score.

Published · July 19, 2026

Updated · October 26, 2026

Description

A flaw was found in the Linux kernel's Kernel-based Virtual Machine (KVM) module, specifically within the Secure Virtual Machine (SVM) component. The sev_dbg_crypt() function, when handling encryption, incorrectly calculates the transfer length, leading to a page overflow. This memory corruption can result in a use-after-free condition. A local attacker could exploit this vulnerability to cause a denial of service or potentially escalate privileges.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 7
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE-805 · Buffer Access with Incorrect Length Value