What is CVE-2020-27784?

CVE-2020-27784 is a medium-severity vulnerability in Linux Kernel, classified under Insertion of Sensitive Information into Sent Data. CVSS score: 5.5/10. Published 2022-09-01.

How severe is CVE-2020-27784?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Is CVE-2020-27784 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Use After Free in Linux Kernel

CVE-2020-27784

A vulnerability was found in the Linux kernel, where accessing a deallocated instance in printer_ioctl() printer_ioctl() tries to access of a printer_dev instance. However, use-after-free arises because it had been freed by gprinter_free().

Published 2022-09-01 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.002 (12.7th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 13th percentile — 12.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

Linux Kernel
Kernel

Weakness classification (CWE)

Public proof-of-concept exploits

References

git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/ (Patch, Mailing List, Vendor Advisory)

Frequently asked questions

What is CVE-2020-27784?: CVE-2020-27784 is a medium-severity vulnerability in Linux Kernel, classified under Insertion of Sensitive Information into Sent Data. CVSS score: 5.5/10. Published 2022-09-01.
How severe is CVE-2020-27784?: Medium severity. CVSS v3 base score is 5.5 out of 10.
Is CVE-2020-27784 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.