Use After Free in Linux Kernel
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.
Vulnerability class: Use-After-Free
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.004 (36.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 36.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
- 404notf0und/CVE-Flow
- ARPSyndicate/cvemon
- alphaSeclab/sec-daily-2020
- kdn111/linux-kernel-exploitation
- khanhdn111/linux-kernel-exploitation
- khanhdz-06/linux-kernel-exploitation
- khanhdz191/linux-kernel-exploitation
- khanhhdz/linux-kernel-exploitation
- khanhhdz06/linux-kernel-exploitation
- khanhnd123/linux-kernel-exploitation
References
- bugzilla.redhat.com/show_bug.cgi (Patch, Third Party Advisory, Issue Tracking)
- git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/ (Patch, Issue Tracking, Vendor Advisory)
- www.spinics.net/lists/stable/msg405099.html (Patch, Mailing List, Third Party Advisory)
- cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.233 (Release Notes, Vendor Advisory)
- cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.194 (Release Notes, Vendor Advisory)
- cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.140 (Release Notes, Vendor Advisory)
- security.netapp.com/advisory/ntap-20201001-0004/ (Third Party Advisory)
- lists.debian.org/debian-lts-announce/2020/10/msg00032.html (mailing-list, Mailing List, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2020/10/msg00034.html (mailing-list, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-25220?
- CVE-2020-25220 is a high-severity vulnerability in Linux Kernel, classified under Use After Free. CVSS score: 7.8/10. Published 2020-09-10.
- How severe is CVE-2020-25220?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2020-25220 known to be exploited?
- 17 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.