CVE-2020-25220: Use After Free
First published: Thu Sep 10 2020(Updated: )
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.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=4.9.0<4.9.233 | |
| Linux Kernel | >=4.14<4.14.194 | |
| Linux Kernel | >=4.19<4.19.140 |
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Reference Links
- https://bugzilla.redhat.com/show_bug.cgi?id=1868453
- https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.194
- https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.140
- https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.233
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-4.14.y&id=82fd2138a5ffd7e0d4320cdb669e115ee976a26e
- https://lists.debian.org/debian-lts-announce/2020/10/msg00032.html
- https://lists.debian.org/debian-lts-announce/2020/10/msg00034.html
- https://security.netapp.com/advisory/ntap-20201001-0004/
- https://www.spinics.net/lists/stable/msg405099.html
Frequently Asked Questions
What is the severity of CVE-2020-25220?
CVE-2020-25220 has a medium severity rating due to its potential impact on memory management in affected Linux kernel versions.
How do I fix CVE-2020-25220?
To fix CVE-2020-25220, upgrade your Linux kernel to versions 4.9.233, 4.14.194, or 4.19.140 and later.
What systems are affected by CVE-2020-25220?
CVE-2020-25220 affects Linux kernel versions 4.9.x before 4.9.233, 4.14.x before 4.14.194, and 4.19.x before 4.19.140.
Is CVE-2020-25220 a critical vulnerability?
CVE-2020-25220 is not classified as a critical vulnerability but poses risks in certain use cases.
What type of vulnerability is CVE-2020-25220?
CVE-2020-25220 is classified as a use-after-free vulnerability related to the cgroups feature in the Linux kernel.
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