Bug 2024326 (CVE-2021-3975) - CVE-2021-3975 libvirt: segmentation fault during VM shutdown can lead to vdsm hang
Summary: CVE-2021-3975 libvirt: segmentation fault during VM shutdown can lead to vdsm...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2021-3975
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: 2021617 2024334 2025044 2026403
Blocks: 2022767
TreeView+ depends on / blocked
 
Reported: 2021-11-17 20:17 UTC by gkamathe
Modified: 2022-05-10 17:45 UTC (History)
16 users (show)

Fixed In Version: libvirt 7.1.0
Doc Type: If docs needed, set a value
Doc Text:
A use-after-free flaw was found in libvirt. The qemuMonitorUnregister() function in qemuProcessHandleMonitorEOF is called using multiple threads without being adequately protected by a monitor lock. This flaw could be triggered by the virConnectGetAllDomainStats API when the guest is shutting down. An unprivileged client with a read-only connection could use this flaw to perform a denial of service attack by causing the libvirt daemon to crash.
Clone Of:
Environment:
Last Closed: 2022-05-10 17:45:34 UTC
Embargoed:

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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 13:17:52 UTC

Description gkamathe 2021-11-17 20:17:25 UTC 
A use-after-free flaw was found in qemuProcessHandleMonitorEOF() within src/qemu/qemu_process.c, here qemuMonitorUnregister() is called using multiple threads without being adequately protected by a monitor lock. This issue could be used by a unprivileged user to perform a denial of service attack by causing segmentation fault on libvirt


Fixed upstream in libvirt:
https://github.com/libvirt/libvirt/commit/1ac703a7d0789e46833f4013a3876c2e3af18ec7
Comment 1 gkamathe 2021-11-17 20:35:12 UTC 
Created libvirt tracking bugs for this issue:

Affects: fedora-all [bug 2024334]
Comment 6 errata-xmlrpc 2022-05-10 13:17:48 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 7 Product Security DevOps Team 2022-05-10 17:45:31 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-2021-3975
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