CVE-2020-27674 Privilege escalation in n/a

What is CVE-2020-27674?

CVE-2020-27674 is a medium-severity vulnerability in Debian Debian Linux, published on 22 Oct 2020. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

An issue was discovered in Xen through 4.14.x allowing x86 PV guest OS users to gain guest OS privileges by modifying kernel memory contents, because invalidation of TLB entries is mishandled during use of an INVLPG-like attack technique.

Weakness: CWE-787

Which versions are affected by CVE-2020-27674?

It affects 3 products.

Products include Debian Debian Linux, Fedoraproject Fedora, Xen Xen.

How do I fix CVE-2020-27674?

Apply the vendor's patch.

Is CVE-2020-27674 being exploited?

There is no known exploitation of CVE-2020-27674 in the wild and no public exploit code.

Other vulnerabilities in Debian Debian Linux

• CVE-2015-3306 ProFTPD Improper Access Control Exploited Critical 10.0
• CVE-2025-49113 RoundCube Webmail Deserialization of Untrusted Data Exploited Critical 9.9
• CVE-2026-24061 GNU InetUtils Argument Injection Exploited Critical 9.8
• CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Exploited Critical 9.8
• CVE-2024-9680 Mozilla Firefox Use-After-Free Exploited Critical 9.8

All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as ALPINE-CVE-2020-27674, DEBIAN-CVE-2020-27674, GHSA-qwpw-7q7c-x5jq, UBUNTU-CVE-2020-27674.