CVE-2021-20268 Integer overflow in kernel

What is CVE-2021-20268?

CVE-2021-20268 is a high-severity vulnerability in Linux kernel, published on 9 Mar 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 access flaw was found in the Linux kernel's implementation of the eBPF code verifier in the way a user running the eBPF script calls dev_map_init_map or sock_map_alloc. This flaw allows a local user to crash the system or possibly escalate their privileges. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.

Weakness: CWE-190, CWE-20

Which versions are affected by CVE-2021-20268?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2021-20268?

Apply the vendor's patch.

Is CVE-2021-20268 being exploited?

There is no known exploitation of CVE-2021-20268 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 A-182986620, DEBIAN-CVE-2021-20268, GHSA-wqqm-p6gj-wr83, PUB-A-182986620, UBUNTU-CVE-2021-20268.