CVE-2021-26708

kernel: race conditions caused by wrong locking in net/vmw_vsock/af_vsock.c

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Severity

Important

Red Hat Product Security

7.8

CVSS 3.1

Review impact separately from score.

Published · February 5, 2021

Updated · November 1, 2026

Description

A flaw was found in the Linux kernel. Wrong locking in the AF_VSOCK socket can cause a local privilege escalation, bypassing SMEP and SMAP. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

Statement

This issue does affect the Red Hat Enterprise Linux 8 kernel versions kernel-4.18.0-240 onwards, starting with Red Hat Enterprise Linux 8.3 GA, which introduced VSOCK multi-transport support. Prior Red Hat Enterprise Linux kernel versions are not affected by this issue.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 7.8
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE-362 · Concurrent Execution using Shared Resource with Improper Synchronization