CVE-2018-19966 Memory corruption in n/a

What is CVE-2018-19966?

CVE-2018-19966 is a high-severity memory corruption vulnerability in Debian Debian Linux, published on 8 Dec 2018. 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 4.11.x allowing x86 PV guest OS users to cause a denial of service (host OS crash) or possibly gain host OS privileges because of an interpretation conflict for a union data structure associated with shadow paging. NOTE: this issue exists because of an incorrect fix for CVE-2017-15595.

Weakness: CWE-436

Which versions are affected by CVE-2018-19966?

It affects 2 products.

Products include Debian Debian Linux, Xen Xen.

How do I fix CVE-2018-19966?

Apply the vendor's patch.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2018-19966 being exploited?

There is no known exploitation of CVE-2018-19966 in the wild and no public exploit code.

Other vulnerabilities in Debian Debian Linux

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• 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-2018-19966, DEBIAN-CVE-2018-19966, GHSA-3635-87f7-gfgj, UBUNTU-CVE-2018-19966.