Bug 2035002 (CVE-2021-4158) - CVE-2021-4158 QEMU: NULL pointer dereference in pci_write() in hw/acpi/pcihp.c
Summary: CVE-2021-4158 QEMU: NULL pointer dereference in pci_write() in hw/acpi/pcihp.c
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2021-4158
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: 2036574 2036581 2036579 2036580
Blocks: 2034575
TreeView+ depends on / blocked
 
Reported: 2021-12-22 17:07 UTC by Mauro Matteo Cascella
Modified: 2022-05-10 18:16 UTC (History)
31 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
A NULL pointer dereference issue was found in the ACPI code of QEMU. A malicious, privileged user within the guest could use this flaw to crash the QEMU process on the host, resulting in a denial of service condition.
Clone Of:
Environment:
Last Closed: 2022-05-10 18:16:33 UTC


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System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2022:1759 0 None None None 2022-05-10 13:17:58 UTC

Description Mauro Matteo Cascella 2021-12-22 17:07:54 UTC
A NULL pointer dereference was found in the ACPI code of QEMU. The flaw lies in hw/acpi/pcihp.c in pci_write() where the `bus` pointer is used without checking if it's NULL, probably because an invalid selector was supplied. A malicious privileged user within the guest could use this flaw to crash the QEMU process on the host, resulting in a denial of service condition.

Upstream issue:
https://gitlab.com/qemu-project/qemu/-/issues/770

Upstream patch:
https://lists.nongnu.org/archive/html/qemu-devel/2021-12/msg01491.html

Comment 2 Philippe Mathieu-Daudé 2021-12-22 19:16:07 UTC
Updated upstream patch: https://www.mail-archive.com/qemu-devel@nongnu.org/msg857944.html (not listing any CVE)

Comment 3 Mauro Matteo Cascella 2022-01-03 09:06:31 UTC
Created qemu tracking bugs for this issue:

Affects: fedora-all [bug 2036574]

Comment 14 errata-xmlrpc 2022-05-10 13:17:54 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2022:1759 https://access.redhat.com/errata/RHSA-2022:1759

Comment 15 Product Security DevOps Team 2022-05-10 18:16:30 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-2021-4158


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