CVE-2020-27066

kernel: use after free in xfrm6_tunnel_free_spi of net/ipv6/xfrm6_tunnel.c leads to local escalation of privilege

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Severity

Low

Red Hat Product Security

6.7

CVSS 3.1

Review impact separately from score.

Published · December 15, 2020

Updated · June 28, 2026

Description

A flaw was found in the Linux kernel. There is a possible use after free due to improper locking. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation.

Statement

This flaw is rated as having Low impact because of the need to have elevated privileges and both configuration with the usage of IPV6.

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 · 6.7
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

CWE-416 · Use After Free