CVE-2021-4095: Fedoraproject Fedora

Medium severity, CVSS 5.5. EPSS: 0.4% chance of exploitation in the next 30 days.

A NULL pointer dereference was found in the Linux kernel's KVM when dirty ring logging is enabled without an active vCPU context. An unprivileged local attacker on the host may use this flaw to cause a kernel oops condition and thus a denial of service by issuing a KVM_XEN_HVM_SET_ATTR ioctl. This flaw affects Linux kernel versions prior to 5.17-rc1.

Affected products

• Fedoraproject Fedora: version 34 only; version 35 only
• Linux Linux Kernel: up to and including 5.16

Published 2022-03-10. Last modified 2026-06-17.