CVE-2022-46340 Memory corruption in xorg-x11-server

What is CVE-2022-46340?

CVE-2022-46340 is a high-severity memory corruption vulnerability in Debian Debian Linux, published on 14 Dec 2022. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

A vulnerability was found in X.Org. This security flaw occurs becuase the swap handler for the XTestFakeInput request of the XTest extension may corrupt the stack if GenericEvents with lengths larger than 32 bytes are sent through a the XTestFakeInput request. This issue can lead to local privileges elevation on systems where the X server is running privileged and remote code execution for ssh X forwarding sessions. This issue does not affect systems where client and server use the same byte order.

Weakness: CWE-787

Which versions are affected by CVE-2022-46340?

It affects 3 products.

Products include Debian Debian Linux, Fedoraproject Fedora, X.org X Server.

How do I fix CVE-2022-46340?

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-2022-46340 being exploited?

There is no known exploitation of CVE-2022-46340 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 AZL-44697, DEBIAN-CVE-2022-46340, GHSA-hvwj-m4ph-92v4, SUSE-SU-2023:0653-1, SUSE-SU-2023:0654-1, SUSE-SU-2023:0655-1 and 5 more.