CVE-2020-25220

The Linux kernel 4.9.x before 4.9.233, 4.14.x before 4.14.194, and 4.19.x before 4.19.140 has a use-after-free because skcd->no_refcnt was not considered during a backport of a CVE-2020-14356 patch. This is related to the cgroups feature.

• CWE-416

• https://bugzilla.redhat.com/show_bug.cgi?id=1868453Issue Tracking, Patch, Third Party Advisory
• https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.194Release Notes, Vendor Advisory
• https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.140Release Notes, Vendor Advisory
• https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.233Release Notes, Vendor Advisory
• https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-4.14.y&id=82fd2138a5ffd7e0d4320cdb669e115ee976a26eIssue Tracking, Patch, Vendor Advisory
• https://lists.debian.org/debian-lts-announce/2020/10/msg00032.htmlMailing List, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2020/10/msg00034.htmlMailing List, Third Party Advisory
• https://security.netapp.com/advisory/ntap-20201001-0004/Third Party Advisory
• https://www.spinics.net/lists/stable/msg405099.htmlMailing List, Patch, Third Party Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=1868453Issue Tracking, Patch, Third Party Advisory
• https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.194Release Notes, Vendor Advisory
• https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.140Release Notes, Vendor Advisory
• https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.233Release Notes, Vendor Advisory
• https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-4.14.y&id=82fd2138a5ffd7e0d4320cdb669e115ee976a26eIssue Tracking, Patch, Vendor Advisory
• https://lists.debian.org/debian-lts-announce/2020/10/msg00032.htmlMailing List, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2020/10/msg00034.htmlMailing List, Third Party Advisory
• https://security.netapp.com/advisory/ntap-20201001-0004/Third Party Advisory
• https://www.spinics.net/lists/stable/msg405099.htmlMailing List, Patch, Third Party Advisory

Published

Sep 10, 2020

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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