CVE-2021-4095 Null dereference in kernel

What is CVE-2021-4095?

CVE-2021-4095 is a medium-severity vulnerability in Fedoraproject Fedora, published on 8 Mar 2022. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

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.

Weakness: CWE-476

Which versions are affected by CVE-2021-4095?

It affects 2 products.

Products include Fedoraproject Fedora, Linux kernel.

How do I fix CVE-2021-4095?

Upgrade to a fixed version.

Is CVE-2021-4095 being exploited?

There is no known exploitation of CVE-2021-4095 in the wild and no public exploit code.

Other vulnerabilities in Fedoraproject Fedora

• CVE-2024-4577 PHP-CGI OS Command Injection Exploited Critical 9.8
• CVE-2021-39226 Grafana Authentication Bypass Exploited Critical 9.8
• CVE-2019-5544 VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow Exploited Critical 9.8
• CVE-2024-4947 Google Chromium V8 Type Confusion Exploited Critical 9.6
• CVE-2024-4671 Google Chromium Visuals Use-After-Free Exploited Critical 9.6

All Fedoraproject Fedora vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-8965, DEBIAN-CVE-2021-4095, GHSA-p8x3-xpch-p28r, ROOT-OS-UBUNTU-2204-CVE-2021-4095, UBUNTU-CVE-2021-4095.