What’s Vulnerable › Vulnerabilities
CVE-2022-33740
- Severity: high (CVSS 7.1 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2022-07-05 · updated 2026-06-17
- Weakness: CWE-212
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).
Affected products
- Debian Linux: 10.0, 11.0
- Fedoraproject Fedora: 35, 36
- Linux kernel: from 2.6.13 before 4.9.322; from 4.14 before 4.14.287; from 4.19 before 4.19.251; from 5.4 before 5.4.204; from 5.10 before 5.10.129; from 5.15 before 5.15.53 — fixed in 4.14.287, 4.19.251, 4.9.322, 5.10.129, 5.15.53, 5.18.10
- xen: all versions
How to fix
Upgrade to a fixed version: Linux kernel 4.14.287, 4.19.251, 4.9.322, 5.10.129. Check the vendor advisory for mitigations.
References
- http://www.openwall.com/lists/oss-security/2022/07/05/6
- http://xenbits.xen.org/xsa/advisory-403.html
- https://lists.debian.org/debian-lts-announce/2022/10/msg00000.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IGFTRZ66KQYTSYIRT5FRHF5D6O72NWOP/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RKRXZ4LHGCGMOG24ZCEJNY6R2BTS4S2Q/
- https://www.debian.org/security/2022/dsa-5191
- https://xenbits.xenproject.org/xsa/advisory-403.txt
- http://www.openwall.com/lists/oss-security/2022/07/05/6
- http://xenbits.xen.org/xsa/advisory-403.html
- https://lists.debian.org/debian-lts-announce/2022/10/msg00000.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IGFTRZ66KQYTSYIRT5FRHF5D6O72NWOP/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RKRXZ4LHGCGMOG24ZCEJNY6R2BTS4S2Q/
Get alerted when CVE-2022-33740 or the next vulnerability affects your stack