CVE-2021-31916 Memory corruption in kernel

What is CVE-2021-31916?

CVE-2021-31916 is a medium-severity memory corruption vulnerability in Debian Debian Linux, published on 6 May 2021. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

An out-of-bounds (OOB) memory write flaw was found in list_devices in drivers/md/dm-ioctl.c in the Multi-device driver module in the Linux kernel before 5.12. A bound check failure allows an attacker with special user (CAP_SYS_ADMIN) privilege to gain access to out-of-bounds memory leading to a system crash or a leak of internal kernel information. The highest threat from this vulnerability is to system availability.

Weakness: CWE-787

Which versions are affected by CVE-2021-31916?

It affects 3 products.

Products include Debian Debian Linux, Linux kernel, Redhat Enterprise Linux.

How do I fix CVE-2021-31916?

Upgrade to a fixed version.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2021-31916 being exploited?

There is no known exploitation of CVE-2021-31916 in the wild and no public exploit code.

Other vulnerabilities in Debian Debian Linux

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• CVE-2025-49113 RoundCube Webmail Deserialization of Untrusted Data Exploited Critical 9.9
• CVE-2026-24061 GNU InetUtils Argument Injection Exploited Critical 9.8
• CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Exploited Critical 9.8
• CVE-2024-9680 Mozilla Firefox Use-After-Free Exploited Critical 9.8

All Debian Debian Linux vulnerabilities

Sources

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

Also known as A-187955767, AZL-6558, DEBIAN-CVE-2021-31916, GHSA-2x6w-89x6-c628, PUB-A-187955767, UBUNTU-CVE-2021-31916.