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CVE-2022-33740

HIGHCVSS 7.1/10EPSS 0.32%

Last modified

CVE-2022-33740 is a high-severity vulnerability rated 7.1/10 on the CVSS scale. 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 estimates a 0.32% chance of exploitation in the next 30 days.

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).

Metrics

CVSS 3.1
7.1/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

EPSS Probability
0.32%

23.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersionsUpdate
FedoraprojectFedora35—
FedoraprojectFedora36—
DebianDebian Linux10.0—
DebianDebian Linux11.0—
LinuxLinux Kernel>= 2.6.13, < 4.9.322—
LinuxLinux Kernel>= 4.14, < 4.14.287—
LinuxLinux Kernel>= 4.19, < 4.19.251—
LinuxLinux Kernel>= 5.4, < 5.4.204—
LinuxLinux Kernel>= 5.10, < 5.10.129—
LinuxLinux Kernel>= 5.15, < 5.15.53—
LinuxLinux Kernel>= 5.18, < 5.18.10—
LinuxLinux Kernel2.6.12Rc2
LinuxLinux Kernel5.19Rc1
XenXenAll versions—

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is 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).
How severe is CVE-2022-33740?
CVE-2022-33740 has a CVSS score of 7.1/10 (HIGH severity). The EPSS model estimates a 0.32% probability of exploitation in the next 30 days.
How do I fix CVE-2022-33740?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2022-33740?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST