Bug 2250458 (AMD-SN-3007, CVE-2023-31346)

Summary:	CVE-2023-31346 kernel: Reserved fields in guest message responses may not be zero initialized
Product:	[Other] Security Response	Reporter:	Nick Tait <ntait>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	dfreiber, drow, jburrell, jforbes, security-response-team, sidakwo, vkumar
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in some AMD CPUs where the guest message responses have not been zero-initialized. This issue may allow a local attacker with the ability to run arbitrary code on a container or virtual machine to discover sensitive information contained in the host system's memory.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2250464, 2279329
Bug Blocks:	2250459

Description Nick Tait 2023-11-18 18:52:11 UTC

Reserved fields in guest message responses may not be zero initialized.
The size of(snp_msg_cpuid_rsp_t) bytes are zero initialized, but ReqHdr->msg_size is sent out for the request. If a guest sets ReqHdr->msg_size to a higher value than sizeof(snp_msg_cpuid_rsp_t),
the firmware may leak stale memory from gpSevScratchBuf+(PAGE_SIZE_4K*3). The stale data leaked to software may contain guest private data or SEV firmware sensitive data.

Comment 8 Alex 2024-05-06 14:46:13 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2279329]

Comment 12 errata-xmlrpc 2024-07-02 15:26:31 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2024:4262 https://access.redhat.com/errata/RHSA-2024:4262

Comment 13 errata-xmlrpc 2024-07-09 08:48:59 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.6 Telecommunications Update Service

Via RHSA-2024:4409 https://access.redhat.com/errata/RHSA-2024:4409

Comment 14 errata-xmlrpc 2024-07-23 14:54:57 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.4 Telecommunications Update Service
  Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions

Via RHSA-2024:4733 https://access.redhat.com/errata/RHSA-2024:4733

Comment 15 errata-xmlrpc 2024-07-23 15:27:28 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.8 Extended Update Support

Via RHSA-2024:4741 https://access.redhat.com/errata/RHSA-2024:4741

Comment 16 errata-xmlrpc 2024-07-23 16:23:55 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2024:4774 https://access.redhat.com/errata/RHSA-2024:4774

Comment 17 errata-xmlrpc 2024-08-20 16:08:04 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Extended Update Support

Via RHSA-2024:5640 https://access.redhat.com/errata/RHSA-2024:5640

Comment 18 errata-xmlrpc 2024-08-27 07:37:43 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.2 Advanced Update Support

Via RHSA-2024:5883 https://access.redhat.com/errata/RHSA-2024:5883