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Vulnerability record · CVE-2020-25670 · published 26 May 2021

CVE-2020-25670: Linux kernel use after free vulnerability

Linux · Linux Kernel

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

7.8 CVSS 3.1 High EPSS 0.59% · top 54.0% CWE-416 · Use after free
7.8CVSS 3.1 base score, v2 7.2
0.59%EPSS exploitation probability, 30 days
NoNot in CISA KEV
14Affected product versions listed by NVD
18References, 6 tagged exploit
17 Jun 2026Last modified by NVD

Description

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

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

Affected products

14 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.openwall.com/lists/oss-security/2020/11/01/1 ExploitMailing ListPatchThird Party Advisory
http://www.openwall.com/lists/oss-security/2021/05/11/4 ExploitMailing ListPatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/06/msg00019.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/06/msg00020.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PW3OASG7OEMHANDWBM5US5W
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UTVACC6PGS6OSD3EYY7FZUA
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VEIEGQXUW37YHZ5MTAZTDCI
https://security.netapp.com/advisory/ntap-20210702-0008/ Third Party Advisory
https://www.openwall.com/lists/oss-security/2020/11/01/1 ExploitMailing ListPatchThird Party Advisory
http://www.openwall.com/lists/oss-security/2020/11/01/1 ExploitMailing ListPatchThird Party Advisory
http://www.openwall.com/lists/oss-security/2021/05/11/4 ExploitMailing ListPatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/06/msg00019.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/06/msg00020.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PW3OASG7OEMHANDWBM5US5W
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UTVACC6PGS6OSD3EYY7FZUA
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VEIEGQXUW37YHZ5MTAZTDCI
https://security.netapp.com/advisory/ntap-20210702-0008/ Third Party Advisory
https://www.openwall.com/lists/oss-security/2020/11/01/1 ExploitMailing ListPatchThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2020-25670), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.