Vulnerability in Linux
CVE-2022-33740
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).
EPSS: 0.003 (24.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H.
Affected products
- Linux — versions consult Xen advisory XSA-403
- Linux Linux_kernel — versions 2.6.12, 5.19
- Xen — versions consult Xen advisory XSA-403
- Debian Debian_linux — versions 10.0, 11.0
- Fedoraproject Fedora — versions 35, 36
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security@xen.org (x_refsource_MISC, Vendor Advisory)
- security@xen.org (x_refsource_CONFIRM, Patch, Vendor Advisory)
- security@xen.org (mailing-list, x_refsource_MLIST, Patch, Mailing List, Third Party Advisory)
- security@xen.org (x_refsource_FEDORA, vendor-advisory)
- security@xen.org (x_refsource_FEDORA, vendor-advisory)
- security@xen.org (vendor-advisory, Third Party Advisory, x_refsource_DEBIAN)
- security@xen.org (mailing-list, x_refsource_MLIST, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2022-33740?
- CVE-2022-33740 is a high-severity vulnerability in Linux, classified under Improper Removal of Sensitive Information Before Storage or Transfer. CVSS score: 7.1/10. Published 2022-07-05.
- How severe is CVE-2022-33740?
- High severity. CVSS v3 base score is 7.1 out of 10.
- Is CVE-2022-33740 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.