CVE-2019-19339

It was found that the Red Hat Enterprise Linux 8 kpatch update did not include the complete fix for CVE-2018-12207. A flaw was found in the way Intel CPUs handle inconsistency between, virtual to physical memory address translations in CPU's local cache and system software's Paging structure entries. A privileged guest user may use this flaw to induce a hardware Machine Check Error on the host processor, resulting in a severe DoS scenario by halting the processor. System software like OS OR Virtual Machine Monitor (VMM) use virtual memory system for storing program instructions and data in memory. Virtual Memory system uses Paging structures like Page Tables and Page Directories to manage system memory. The processor's Memory Management Unit (MMU) uses Paging structure entries to translate program's virtual memory addresses to physical memory addresses. The processor stores these address translations into its local cache buffer called - Translation Lookaside Buffer (TLB). TLB has two parts, one for instructions and other for data addresses. System software can modify its Paging structure entries to change address mappings OR certain attributes like page size etc. Upon such Paging structure alterations in memory, system software must invalidate the corresponding address translations in the processor's TLB cache. But before this TLB invalidation takes place, a privileged guest user may trigger an instruction fetch operation, which could use an already cached, but now invalid, virtual to physical address translation from Instruction TLB (ITLB). Thus accessing an invalid physical memory address and resulting in halting the processor due to the Machine Check Error (MCE) on Page Size Change.
References
Link Resource
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-19339 Issue Tracking Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-19339 Issue Tracking Vendor Advisory
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_eus:8.1:*:*:*:*:*:*:*

History

21 Nov 2024, 04:34

Type Values Removed Values Added
References () https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-19339 - Issue Tracking, Vendor Advisory () https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-19339 - Issue Tracking, Vendor Advisory

Information

Published : 2020-01-17 19:15

Updated : 2024-11-21 04:34


NVD link : CVE-2019-19339

Mitre link : CVE-2019-19339

CVE.ORG link : CVE-2019-19339


JSON object : View

Products Affected

redhat

  • enterprise_linux
  • enterprise_linux_eus
CWE
CWE-805

Buffer Access with Incorrect Length Value

NVD-CWE-noinfo