CVE-2022-33740 Information disclosure in Linux

What is CVE-2022-33740?

CVE-2022-33740 is a high-severity vulnerability in Debian Debian Linux, published on 5 Jul 2022. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

Linux disk/nic frontends data leaks T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Linux Block and Network PV device frontends don't zero memory regions before sharing them with the backend (CVE-2022-26365, CVE-2022-33740). Additionally the granularity of the grant table doesn't allow sharing less than a 4K page, leading to unrelated data residing in the same 4K page as data shared with a backend being accessible by such backend (CVE-2022-33741, CVE-2022-33742).

Weakness: CWE-212

Which versions are affected by CVE-2022-33740?

It affects 4 products.

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

How do I fix CVE-2022-33740?

Apply the vendor's patch.

Is CVE-2022-33740 being exploited?

There is no known exploitation of CVE-2022-33740 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-2022-33740, DEBIAN-CVE-2022-33740, GHSA-4v86-x4wc-r83p, UBUNTU-CVE-2022-33740.