Bug 1919210 (CVE-2021-20196)
| Summary: | CVE-2021-20196 QEMU: block: fdc: null pointer dereference may lead to guest crash | ||
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| Product: | [Other] Security Response | Reporter: | Prasad Pandit <ppandit> |
| Component: | vulnerability | Assignee: | Red Hat Product Security <security-response-team> |
| Status: | CLOSED ERRATA | QA Contact: | |
| Severity: | low | Docs Contact: | |
| Priority: | low | ||
| Version: | unspecified | CC: | ailan, berrange, cfergeau, dbecker, drjones, imammedo, itamar, jen, jferlan, jforbes, jjoyce, jmaloy, jschluet, knoel, lhh, lpeer, m.a.young, mburns, mkenneth, mrezanin, mst, ondrejj, pbonzini, qinwang, ribarry, rjones, robinlee.sysu, sclewis, security-response-team, slinaber, virt-maint, virt-maint, vkuznets, xen-maint |
| Target Milestone: | --- | Keywords: | Security |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | If docs needed, set a value | |
| Doc Text: |
A NULL pointer dereference flaw was found in the floppy disk emulator of QEMU. This issue occurs while processing read/write ioport commands if the selected floppy drive is not initialized with a block device. This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of service. The highest threat from this vulnerability is to system availability.
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Story Points: | --- |
| Clone Of: | Environment: | ||
| Last Closed: | 2022-02-02 10:01:43 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
| Bug Depends On: | 1919532, 1919533, 1921546, 1921547, 1921548, 1921549, 1929016, 1929017, 1929019, 1929020, 1944624, 2028980 | ||
| Bug Blocks: | 1909094 | ||
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Description
Prasad Pandit
2021-01-22 12:02:50 UTC
Acknowledgments: Name: Gaoning Pan (Zhejiang University & Ant Security Light-Year Lab) External References: https://bugs.launchpad.net/qemu/+bug/1912780 https://www.openwall.com/lists/oss-security/2021/01/28/1 Created qemu tracking bugs for this issue: Affects: fedora-all [bug 1919532] Created xen tracking bugs for this issue: Affects: fedora-all [bug 1919533] Statement: This issue affects the version of the qemu-kvm package shipped with Red Hat Enterprise Linux 5, 6, 7 and 8. Future qemu-kvm package updates for Red Hat Enterprise Linux 7 and 8 may address this issue. This has been rated as having Low security impact and is not currently planned to be addressed in future updates of Red Hat Enterprise Linux 5 & 6. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata/. This issue has been addressed in the following products: Advanced Virtualization for RHEL 8.4.0.EUS Via RHSA-2022:0325 https://access.redhat.com/errata/RHSA-2022:0325 This issue has been addressed in the following products: Advanced Virtualization for RHEL 8.5.0.Z Via RHSA-2022:0397 https://access.redhat.com/errata/RHSA-2022:0397 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-2021-20196 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 |