VulnerabilityModified

CVE-2022-42327

Access to this shared page bypasses the expected isolation that should exist between two guests.

HIGH 7.1EPSS 0.23%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (0.23%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

Description

x86: unintended memory sharing between guests On Intel systems that support the "virtualize APIC accesses" feature, a guest can read and write the global shared xAPIC page by moving the local APIC out of xAPIC mode. Access to this shared page bypasses the expected isolation that should exist between two guests.

CVSS 3.1: 7.1 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
EPSS: 0.23% probability · 14th percentile
CISA KEV: Not listed
Weakness: CWE-284
Affected: xen/xen · fedoraproject/fedora
Source: security@xen.org

References

http://www.openwall.com/lists/oss-security/2022/11/01/3Mailing List, Patch, Third Party Advisory
http://xenbits.xen.org/xsa/advisory-412.htmlPatch, Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YTMITQBGC23MSDHUCAPCVGLMVXIBXQTQ/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZLI2NPNEH7CNJO3VZGQNOI4M4EWLNKPZ/
https://security.gentoo.org/glsa/202402-07
https://xenbits.xenproject.org/xsa/advisory-412.txtVendor Advisory
http://www.openwall.com/lists/oss-security/2022/11/01/3Mailing List, Patch, Third Party Advisory
http://xenbits.xen.org/xsa/advisory-412.htmlPatch, Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YTMITQBGC23MSDHUCAPCVGLMVXIBXQTQ/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZLI2NPNEH7CNJO3VZGQNOI4M4EWLNKPZ/
https://security.gentoo.org/glsa/202402-07
https://xenbits.xenproject.org/xsa/advisory-412.txtVendor Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.