Use After Free in Linux Kernel
CVE-2020-25656
A flaw was found in the Linux kernel. A use-after-free was found in the way the console subsystem was using ioctls KDGKBSENT and KDSKBSENT. A local user could use this flaw to get read memory access out of bounds. The highest threat from this vulnerability is to data confidentiality.
Vulnerability class: Use-After-Free
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.1 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (35.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 35.7% 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
- Linux Kernel — versions 5.10
- Starwindsoftware Starwind Virtual San — versions v8
- Debian Linux — versions 9.0
- Red Hat Enterprise Linux — versions 7.0, 8.0
- Kernel — versions kernel 5.10-rc2
Weakness classification (CWE)
Public proof-of-concept exploits
References
- bugzilla.redhat.com/show_bug.cgi (Exploit, Patch, Third Party Advisory, Issue Tracking)
- lkml.org/lkml/2020/10/29/528 (Patch, Mailing List, Third Party Advisory)
- lkml.org/lkml/2020/10/16/84 (Exploit, Mailing List, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2020/12/msg00015.html (mailing-list, Mailing List, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2020/12/msg00027.html (mailing-list, Mailing List, Third Party Advisory)
- www.starwindsoftware.com/security/sw-20210325-0006/ (Third Party Advisory)
Frequently asked questions
- What is CVE-2020-25656?
- CVE-2020-25656 is a medium-severity vulnerability in Linux Kernel, classified under Use After Free. CVSS score: 4.1/10. Published 2020-12-02.
- How severe is CVE-2020-25656?
- Medium severity. CVSS v3 base score is 4.1 out of 10.
- Is CVE-2020-25656 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.