What’s Vulnerable › Vulnerabilities

CVE-2020-25668

• Severity: high (CVSS 7.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-05-26 · updated 2026-06-17
• Weakness: CWE-362

Description

A flaw was found in Linux Kernel because access to the global variable fg_console is not properly synchronized leading to a use after free in con_font_op.

Affected products

• Debian Linux: 9.0
• Linux kernel: before 4.4.242; from 4.5 before 4.9.242; from 4.10 before 4.14.204; from 4.15 before 4.19.155; from 4.20 before 5.4.75; from 5.5 before 5.9.5 — fixed in 4.14.204, 4.19.155, 4.4.242, 4.9.242, 5.4.75, 5.9.5
• NetApp 500F Firmware: all versions
• NetApp A250 Firmware: all versions
• NetApp Cloud Backup: all versions
• NetApp H300E Firmware: all versions
• NetApp H300S Firmware: all versions
• NetApp H410C Firmware: all versions
• NetApp H410S Firmware: all versions
• NetApp H500E Firmware: all versions
• NetApp H500S Firmware: all versions
• NetApp H700E Firmware: all versions
• NetApp H700S Firmware: all versions
• NetApp Solidfire & Hci Management Node: all versions
• NetApp Solidfire Baseboard Management Controller Firmware: all versions

How to fix

Upgrade to a fixed version: Linux kernel 4.14.204, 4.19.155, 4.4.242, 4.9.242. Check the vendor advisory for mitigations.

References

• http://www.openwall.com/lists/oss-security/2020/10/30/1
• http://www.openwall.com/lists/oss-security/2020/11/04/3
• https://bugzilla.redhat.com/show_bug.cgi?id=1893287%2C
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=90bfdeef83f1d6c696039b6a917190dcbbad3220
• https://lists.debian.org/debian-lts-announce/2020/12/msg00015.html
• https://lists.debian.org/debian-lts-announce/2020/12/msg00027.html
• https://security.netapp.com/advisory/ntap-20210702-0005/
• https://www.openwall.com/lists/oss-security/2020/10/30/1%2C
• https://www.openwall.com/lists/oss-security/2020/11/04/3%2C
• http://www.openwall.com/lists/oss-security/2020/10/30/1
• http://www.openwall.com/lists/oss-security/2020/11/04/3
• https://bugzilla.redhat.com/show_bug.cgi?id=1893287%2C

Get alerted when CVE-2020-25668 or the next vulnerability affects your stack