CVE-2021-3736 Information disclosure in kernel

What is CVE-2021-3736?

CVE-2021-3736 is a medium-severity vulnerability in Linux kernel, published on 23 Aug 2022. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A flaw was found in the Linux kernel. A memory leak problem was found in mbochs_ioctl in samples/vfio-mdev/mbochs.c in Virtual Function I/O (VFIO) Mediated devices. This flaw could allow a local attacker to leak internal kernel information.

Weakness: CWE-401, CWE-200

Which versions are affected by CVE-2021-3736?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2021-3736?

Apply the vendor's patch.

Is CVE-2021-3736 being exploited?

There is no known exploitation of CVE-2021-3736 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

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

Also known as DEBIAN-CVE-2021-3736, GHSA-c24j-22f8-p2wg, UBUNTU-CVE-2021-3736.