Skip to content
Fencer Intel
high 7.1

CVE-2022-33740 json

Linux disk/nic frontends data leaks T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities…

published 4y ago modified 4mo ago also EUVD-2022-36779

cvss
7.1
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 26%
public exploits
0
none known

Summary

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).

Patch / fix

  • linux linux_kernel 4.9.322, 4.14.287, 4.19.251, 5.4.204, 5.10.129, 5.15.53, 5.18.10
  • xen Debian 14, Debian 13, Debian 12 4.16.2-1
  • linux Debian 14, Debian 13, Debian 12 5.18.14-1

debian advisories DEBIAN-CVE-2022-33740

  • linux Ubuntu 18.04 LTS 4.15.0-194.205
  • linux Ubuntu 20.04 LTS 5.4.0-128.144
  • linux Ubuntu 22.04 LTS 5.15.0-48.54
  • linux-aws Ubuntu 18.04 LTS 4.15.0-1142.154
  • linux-aws Ubuntu 20.04 LTS 5.4.0-1086.93
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1020.24
  • linux-gcp Ubuntu 20.04 LTS 5.4.0-1090.98
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1018.24

ubuntu advisories UBUNTU-CVE-2022-33740

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • xen SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLES 15 SP1-BCL +3 more 4.12.4_30-150100.3.80.1
  • xen SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 4.12.4_28-3.77.1
  • xen SLE Module for Server Applications 15 SP3, SLE Module for Basesystem 15 SP3, SLE Micro 5.2 +3 more 4.14.5_06-150300.3.35.1
  • kernel-rt SLE Micro 5.2, SLE Micro 5.1, Real Time Module 15 SP3 +1 more 5.3.18-150300.99.1
  • kernel-syms-rt Real Time Module 15 SP3 5.3.18-150300.99.1
  • kernel-rt_debug Real Time Module 15 SP3 5.3.18-150300.99.1
  • kernel-source-rt Real Time Module 15 SP3 5.3.18-150300.99.1
  • kernel-default SLE Workstation Extension 15 SP3, SLE Module for Legacy 15 SP3, SLE Module for Basesystem 15 SP3 +6 more 5.3.18-150300.59.90.1

suse advisories SUSE-SU-2022:3928-1SUSE-SU-2022:3728-1SUSE-SU-2022:3665-1SUSE-SU-2022:2892-2SUSE-SU-2022:2892-1SUSE-SU-2022:2875-2

  • xen Alpine 3.13 4.14.5-r3
  • xen Alpine 3.15, Alpine 3.14 4.15.3-r0
  • xen Alpine 3.16 4.16.1-r3
  • xen Alpine 3.24, Alpine 3.23, Alpine 3.22 +5 more 4.16.1-r4

alpine advisories ALPINE-CVE-2022-33740

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Is CVE-2022-33740 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2022-33740 updated cvss 7.7

xen: Linux disk/nic frontends data leaks

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present “There is no mitigation available other than not using PV devices in case a backend is suspected to be potentially malicious.”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.33% chance of exploitation in the next 30 days, higher than 26% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 7.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
NVD 2.0 3.6 AV:L/AC:L/Au:N/C:P/I:N/A:P

Affected products

  • Linux Linux
  • Xen xen

Classification

Weakness
  • CWE-212 Improper Removal of Sensitive Information Before Storage or Transfer
Technology feeds

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.