Use After Free in Linux Kernel
CVE-2020-27786
A flaw was found in the Linux kernel’s implementation of MIDI, where an attacker with a local account and the permissions to issue ioctl commands to midi devices could trigger a use-after-free issue. A write to this specific memory while freed and before use causes the flow of execution to change and possibly allow for memory corruption or privilege escalation. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.
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: 0.017 (76.0th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 76th percentile — 76.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · change: 0.000
Affected products
- Linux Kernel
- NetApp Cloud Backup
- NetApp Solidfire Baseboard Management Controller
- Red Hat Enterprise Linux — versions 7.0, 8.0
- Red Hat Enterprise Mrg — versions 2.0
- Red Hat Openshift Container Platform — versions 4.4, 4.5, 4.6
- Kernel — versions kernel 5.7-rc6
Weakness classification (CWE)
Public proof-of-concept exploits
References
- git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/ (Patch, Vendor Advisory)
- www.openwall.com/lists/oss-security/2020/12/03/1 (mailing-list, Mailing List)
- bugzilla.redhat.com/show_bug.cgi (Patch, Third Party Advisory, Issue Tracking)
- security.netapp.com/advisory/ntap-20210122-0002/ (Third Party Advisory)
Frequently asked questions
- What is CVE-2020-27786?
- CVE-2020-27786 is a high-severity vulnerability in Linux Kernel, classified under Use After Free. CVSS score: 7.8/10. Published 2020-12-11.
- How severe is CVE-2020-27786?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2020-27786 known to be exploited?
- 30 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.