Bug 1992264 (CVE-2021-38198) - CVE-2021-38198 kernel: arch/x86/kvm/mmu/paging_tmpl.h incorrectly computes the access permissions of a shadow page
Summary: CVE-2021-38198 kernel: arch/x86/kvm/mmu/paging_tmpl.h incorrectly computes th...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2021-38198
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1992265 1993227 1993228 1993229 1993230 1993231
Blocks: 1992266
TreeView+ depends on / blocked
 
Reported: 2021-08-10 20:20 UTC by Guilherme de Almeida Suckevicz
Modified: 2022-04-17 21:33 UTC (History)
40 users (show)

Fixed In Version: Linux kernel 5.13-rc6
Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in the Linux kernel, where it incorrectly computes the access permissions of a shadow page. This issue leads to a missing guest protection page fault.
Clone Of:
Environment:
Last Closed: 2021-12-15 11:26:26 UTC


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Description Guilherme de Almeida Suckevicz 2021-08-10 20:20:47 UTC
arch/x86/kvm/mmu/paging_tmpl.h in the Linux kernel before 5.12.11 incorrectly computes the access permissions of a shadow page, leading to a missing guest protection page fault.

Reference and upstream patch:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b1bd5cba3306691c771d558e94baa73e8b0b96b7

Comment 1 Guilherme de Almeida Suckevicz 2021-08-10 20:21:19 UTC
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1992265]

Comment 2 Justin M. Forbes 2021-08-11 19:55:48 UTC
This was fixed for Fedora with the 5.12.11 stable kernel updates.


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