CVE-2021-26708

Name: CVE-2021-26708
Creator: NVD / NIST
Published: 2021-02-05T14:15:18.78+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7/10EPSS 1.60%

Last modified Jun 17, 2026

CVE-2021-26708 is a high-severity vulnerability rated 7/10 on the CVSS scale. 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. EPSS estimates a 1.60% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7/10

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

1.60%

72.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-667

Affected Software

Vendor	Product	Versions
Linux	Linux Kernel	>= 5.5, < 5.10.13
Netapp	Aff Baseboard Management Controller	All versions
Netapp	Cloud Backup	All versions
Netapp	Fas Baseboard Management Controller	All versions
Netapp	Solidfire \& Hci Management Node	All versions
Netapp	Solidfire Baseboard Management Controller	All versions
Netapp	Baseboard Management Controller 500f Firmware	< 15.3
Netapp	Baseboard Management Controller A250 Firmware	< 15.3
Netapp	Hci H410c Firmware	All versions

References

http://www.openwall.com/lists/oss-security/2021/02/05/6Mailing List, Patch, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/04/09/2Mailing List
http://www.openwall.com/lists/oss-security/2022/01/25/14Mailing List
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.13Release Notes, Vendor Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c518adafa39f37858697ac9309c6cf1805581446Patch, Vendor Advisory
https://security.netapp.com/advisory/ntap-20210312-0008/Patch, Third Party Advisory
https://www.openwall.com/lists/oss-security/2021/02/04/5Mailing List, Patch, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/02/05/6Mailing List, Patch, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/04/09/2Mailing List
http://www.openwall.com/lists/oss-security/2022/01/25/14Mailing List
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.13Release Notes, Vendor Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c518adafa39f37858697ac9309c6cf1805581446Patch, Vendor Advisory
https://security.netapp.com/advisory/ntap-20210312-0008/Patch, Third Party Advisory
https://www.openwall.com/lists/oss-security/2021/02/04/5Mailing List, Patch, Third Party Advisory

Timeline

Published: Feb 5, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-26708?

How severe is CVE-2021-26708?

CVE-2021-26708 has a CVSS score of 7/10 (HIGH severity). The EPSS model estimates a 1.60% probability of exploitation in the next 30 days.

How do I fix CVE-2021-26708?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-26708?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST