What’s Vulnerable › Vulnerabilities

CVE-2020-25671

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-05-26 · updated 2026-06-17
• Weakness: CWE-416

Description

A vulnerability was found in Linux Kernel, where a refcount leak in llcp_sock_connect() causing use-after-free which might lead to privilege escalations.

Affected products

• Debian Linux: 9.0
• Fedoraproject Fedora: 32, 33, 34
• Linux kernel: from 3.6 before 4.4.267; from 4.5 before 4.9.267; from 4.10 before 4.14.231; from 4.15 before 4.19.187; from 4.20 before 5.4.112; from 5.5 before 5.10.30 — fixed in 4.14.231, 4.19.187, 4.4.267, 4.9.267, 5.10.30, 5.11.14
• Active IQ Unified Manager for VMware vSphere, Linux, and Microsoft Windows: all versions
• NetApp Cloud Backup: all versions
• NetApp H300E Firmware: all versions
• NetApp H300S Firmware: all versions
• NetApp H410C Firmware: all versions
• NetApp H410S Firmware: all versions
• NetApp H500E Firmware: all versions
• NetApp H500S Firmware: all versions
• NetApp H700E Firmware: all versions
• NetApp H700S Firmware: all versions
• NetApp Solidfire Baseboard Management Controller Firmware: all versions

How to fix

Upgrade to a fixed version: Linux kernel 4.14.231, 4.19.187, 4.4.267, 4.9.267. Check the vendor advisory for mitigations.

References

• http://www.openwall.com/lists/oss-security/2020/11/01/1
• https://lists.debian.org/debian-lts-announce/2021/06/msg00019.html
• https://lists.debian.org/debian-lts-announce/2021/06/msg00020.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PW3OASG7OEMHANDWBM5US5WKTOC76KMH/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UTVACC6PGS6OSD3EYY7FZUAZT2EUMFH5/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VEIEGQXUW37YHZ5MTAZTDCIMHUN26NJS/
• https://security.netapp.com/advisory/ntap-20210702-0008/
• https://www.openwall.com/lists/oss-security/2020/11/01/1
• http://www.openwall.com/lists/oss-security/2020/11/01/1
• https://lists.debian.org/debian-lts-announce/2021/06/msg00019.html
• https://lists.debian.org/debian-lts-announce/2021/06/msg00020.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PW3OASG7OEMHANDWBM5US5WKTOC76KMH/

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