This site requires JavaScript to be enabled to function correctly, please enable it.
Bug 2069793 (CVE-2022-1158) - CVE-2022-1158 kernel: KVM: cmpxchg_gpte can write to pfns outside the userspace region
Summary: CVE-2022-1158 kernel: KVM: cmpxchg_gpte can write to pfns outside the userspa...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2022-1158
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2096819 2100245 2100246 2100247 2100248 2122535 2122536 2122537 2122538 2122539 2122541 2122542 2122543 2122544 2122545 2122546 2122547 2122548 2122549 2122550 2122551 2166330 2166331
Blocks: 2069794 2069796
TreeView+ depends on / blocked
 
Reported: 2022-03-29 17:36 UTC by Marian Rehak
Modified: 2023-09-18 04:34 UTC (History)
59 users (show)

Fixed In Version: kernel 5.18
Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in KVM. When updating a guest's page table entry, vm_pgoff was improperly used as the offset to get the page's pfn. As vaddr and vm_pgoff are controllable by user-mode processes, this flaw allows unprivileged local users on the host to write outside the userspace region and potentially corrupt the kernel, resulting in a denial of service condition.
Clone Of:
Environment:
Last Closed: 2022-12-16 10:48:35 UTC
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2022:9021 0 None None None 2022-12-14 12:02:52 UTC
Red Hat Product Errata RHSA-2022:8673 0 None None None 2022-11-29 13:59:43 UTC
Red Hat Product Errata RHSA-2022:8685 0 None None None 2022-11-29 14:01:07 UTC
Red Hat Product Errata RHSA-2022:8686 0 None None None 2022-11-29 13:57:18 UTC
Red Hat Product Errata RHSA-2022:8809 0 None None None 2022-12-06 09:54:49 UTC
Red Hat Product Errata RHSA-2022:8831 0 None None None 2022-12-06 14:50:17 UTC
Red Hat Product Errata RHSA-2022:8940 0 None None None 2022-12-13 09:34:03 UTC
Red Hat Product Errata RHSA-2022:8941 0 None None None 2022-12-13 09:34:55 UTC
Red Hat Product Errata RHSA-2022:8973 0 None None None 2022-12-13 16:05:30 UTC
Red Hat Product Errata RHSA-2022:8974 0 None None None 2022-12-13 16:06:06 UTC
Red Hat Product Errata RHSA-2022:8989 0 None None None 2022-12-13 15:53:37 UTC
Red Hat Product Errata RHSA-2022:9082 0 None None None 2022-12-15 16:24:33 UTC

Description Marian Rehak 2022-03-29 17:36:26 UTC 
Since both vaddr and vm_pgoff are controllable by the user-mode process, writing may exceed the previously mapped guest memory space and trigger exceptions such as UAF.
Comment 2 Marian Rehak 2022-06-14 11:17:06 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2096819]
Comment 3 Justin M. Forbes 2022-06-16 14:15:17 UTC 
This was fixed for Fedora with the 5.16.19 stable kernel updates.
Comment 4 Mauro Matteo Cascella 2022-06-22 19:44:58 UTC 
This bug was introduced in kernel upstream version 5.2 with commit [1].
For distros and stable, Paolo Bonzini sent an inline assembly patch that
updates the gPTE using a valid userspace address [2]. With the same method,
Sean Christopherson and Peter Zijlstra introduced macros for CMPXCHG and
replaced cmpxchg_gpte() with __try_cmpxchg_user() [3].

[1] https://github.com/torvalds/linux/commit/bd53cb35a3e9adb73a834a36586e9ad80e877767
[2] https://github.com/torvalds/linux/commit/2a8859f373b0a86f0ece8ec8312607eacf12485d
[3] https://github.com/torvalds/linux/commit/f122dfe4476890d60b8c679128cd2259ec96a24c
Comment 14 Paolo Bonzini 2022-09-22 10:22:26 UTC 
I suggest using the simpler fix at upstream commit 2a8859f373b0a86f0ece8ec8312607eacf12485d for z-stream.
Comment 17 errata-xmlrpc 2022-11-29 13:57:13 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.4 Extended Update Support

Via RHSA-2022:8686 https://access.redhat.com/errata/RHSA-2022:8686
Comment 18 errata-xmlrpc 2022-11-29 13:59:39 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.4 Extended Update Support

Via RHSA-2022:8673 https://access.redhat.com/errata/RHSA-2022:8673
Comment 19 errata-xmlrpc 2022-11-29 14:01:04 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.4 Extended Update Support

Via RHSA-2022:8685 https://access.redhat.com/errata/RHSA-2022:8685
Comment 20 errata-xmlrpc 2022-12-06 09:54:45 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.6 Extended Update Support

Via RHSA-2022:8809 https://access.redhat.com/errata/RHSA-2022:8809
Comment 21 errata-xmlrpc 2022-12-06 14:50:12 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.6 Extended Update Support

Via RHSA-2022:8831 https://access.redhat.com/errata/RHSA-2022:8831
Comment 23 errata-xmlrpc 2022-12-13 09:34:00 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.2 Advanced Update Support
  Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.2 Telecommunications Update Service

Via RHSA-2022:8940 https://access.redhat.com/errata/RHSA-2022:8940
Comment 24 errata-xmlrpc 2022-12-13 09:34:52 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.2 Telecommunications Update Service

Via RHSA-2022:8941 https://access.redhat.com/errata/RHSA-2022:8941
Comment 25 errata-xmlrpc 2022-12-13 15:53:33 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions

Via RHSA-2022:8989 https://access.redhat.com/errata/RHSA-2022:8989
Comment 26 errata-xmlrpc 2022-12-13 16:05:25 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.0 Extended Update Support

Via RHSA-2022:8973 https://access.redhat.com/errata/RHSA-2022:8973
Comment 27 errata-xmlrpc 2022-12-13 16:06:01 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.0 Extended Update Support

Via RHSA-2022:8974 https://access.redhat.com/errata/RHSA-2022:8974
Comment 28 errata-xmlrpc 2022-12-15 16:24:29 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.0 Extended Update Support

Via RHSA-2022:9082 https://access.redhat.com/errata/RHSA-2022:9082
Comment 29 Product Security DevOps Team 2022-12-16 10:48:31 UTC 
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2022-1158
Comment 32 Red Hat Bugzilla 2023-09-18 04:34:22 UTC 
The needinfo request[s] on this closed bug have been removed as they have been unresolved for 120 days
Note You need to log in before you can comment on or make changes to this bug.