CVE-2022-42335
x86 shadow paging arbitrary pointer dereference In environments where host assisted address translation is necessary but Hardware Assisted Paging (HAP) is unavailable, Xen will run guests in so called shadow mode.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.26%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
x86 shadow paging arbitrary pointer dereference In environments where host assisted address translation is necessary but Hardware Assisted Paging (HAP) is unavailable, Xen will run guests in so called shadow mode. Due to too lax a check in one of the hypervisor routines used for shadow page handling it is possible for a guest with a PCI device passed through to cause the hypervisor to access an arbitrary pointer partially under guest control.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.26% probability · 18th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-476
- Affected
- xen/xen · fedoraproject/fedora
- Source
- security@xen.org
References
- http://www.openwall.com/lists/oss-security/2023/04/25/1Mailing List, Third Party Advisory
- http://xenbits.xen.org/xsa/advisory-430.htmlPatch, Vendor Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PSPFWSY6UOPGMADQGOGN2PAAS5LJRPTG/
- https://security.gentoo.org/glsa/202402-07
- https://xenbits.xenproject.org/xsa/advisory-430.txtPatch, Vendor Advisory
- http://www.openwall.com/lists/oss-security/2023/04/25/1Mailing List, Third Party Advisory
- http://xenbits.xen.org/xsa/advisory-430.htmlPatch, Vendor Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PSPFWSY6UOPGMADQGOGN2PAAS5LJRPTG/
- https://security.gentoo.org/glsa/202402-07
- https://xenbits.xenproject.org/xsa/advisory-430.txtPatch, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.