CVE-2021-26708 Race condition in n/a

What is CVE-2021-26708?

CVE-2021-26708 is a high-severity vulnerability in Linux kernel, published on 5 Feb 2021. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A local privilege escalation was discovered in the Linux kernel before 5.10.13. Multiple race conditions in the AF_VSOCK implementation are caused by wrong locking in net/vmw_vsock/af_vsock.c. The race conditions were implicitly introduced in the commits that added VSOCK multi-transport support.

Weakness: CWE-667

Which versions are affected by CVE-2021-26708?

It affects 9 products.

Products include Linux kernel, Netapp Aff Baseboard Management Controller, Netapp Baseboard Management Controller 500f Firmware, Netapp Baseboard Management Controller A250 Firmware, Netapp Cloud Backup, Netapp Fas Baseboard Management Controller and 3 more.

How do I fix CVE-2021-26708?

Apply the vendor's patch.

Is CVE-2021-26708 being exploited?

There is no known exploitation of CVE-2021-26708 in the wild and no public exploit code.

Public exploit code: 3 proofs of concept on GitHub.

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-2021-26708, GHSA-hhxw-8c9w-q5q9, MGASA-2021-0084, UBUNTU-CVE-2021-26708, USN-4727-1.