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Fencer Vulns
medium 6.5

CVE-2021-3611 json

A stack overflow vulnerability was found in the Intel HD Audio device (intel-hda) of QEMU.

published 2022-05-11 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-26915

cvss
6.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 40%
public exploits
0
none known

Summary

A stack overflow vulnerability was found in the Intel HD Audio device (intel-hda) of QEMU. A malicious guest could use this flaw to crash the QEMU process on the host, resulting in a denial of service condition. The highest threat from this vulnerability is to system availability. This flaw affects QEMU versions prior to 7.0.0.

Patch / fix

  • qemu qemu 7.0.0
  • qemu Debian 14, Debian 13, Debian 12 1:7.0+dfsg-1

debian advisories DEBIAN-CVE-2021-3611

  • qemu Ubuntu 22.04 LTS 1:6.2+dfsg-2ubuntu6.16

ubuntu advisories UBUNTU-CVE-2021-3611

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • qemu-kvm RHEL 9 17:7.0.0-13.el9
  • qemu-img RHEL 9 17:7.0.0-13.el9
  • qemu-kvm-core RHEL 9 17:7.0.0-13.el9
  • qemu-kvm-tools RHEL 9 17:7.0.0-13.el9
  • qemu-pr-helper RHEL 9 17:7.0.0-13.el9
  • qemu-kvm-common RHEL 9 17:7.0.0-13.el9
  • qemu-guest-agent RHEL 9 17:7.0.0-13.el9
  • qemu-kvm-audio-pa RHEL 9 17:7.0.0-13.el9

red hat advisories RHSA-2022:7967

  • qemu SLE Micro 5.4, SLE Micro 5.3 6.2.0-150400.37.40.1
  • qemu SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLES 15 SP1-BCL +6 more 3.1.1.1-9.30.2
  • qemu SLES for SAP 12 SP3, SLES 12 SP3-LTSS, SLES 12 SP3-BCL +3 more 2.9.1-6.53.1
  • qemu SLES for SAP 12 SP4, SLES 12 SP4-LTSS, OpenStack Cloud Crowbar 9 +1 more 2.11.2-5.35.1
  • qemu SLE Module for Server Applications 15 SP2, SLE Module for Basesystem 15 SP2, SLE Micro 5.0 4.2.1-11.25.2
  • qemu SLES for SAP 15, SLES 15-LTSS, SLE High Performance Computing 15-LTSS +1 more 2.11.2-9.49.1
  • qemu SLES for SAP 12 SP5, SLES 12 SP5 3.1.1.1-54.1
  • qemu SLE Module for Server Applications 15 SP3, SLE Module for Basesystem 15 SP3 5.2.0-23.1

suse advisories SUSE-SU-2025:0432-1SUSE-SU-2021:2591-1SUSE-SU-2021:2563-1SUSE-SU-2021:2546-1SUSE-SU-2021:2474-1SUSE-SU-2021:2461-1

  • qemu openSUSE Leap 15.2 4.2.1-lp152.9.20.1
  • qemu-testsuite openSUSE Leap 15.2 4.2.1-lp152.9.20.1
  • qemu-linux-user openSUSE Leap 15.2 4.2.1-lp152.9.20.1
  • qemu openSUSE Leap 15.3 3.1.1.1-9.30.2
  • qemu openSUSE Leap 15.3 4.2.1-11.25.2
  • qemu openSUSE Leap 15.3 5.2.0-23.1

opensuse advisories openSUSE-SU-2021:1202-1openSUSE-SU-2021:2591-1openSUSE-SU-2021:2474-1openSUSE-SU-2021:2442-1

  • qemu-kvm AlmaLinux 9 17:7.0.0-13.el9
  • qemu-img AlmaLinux 9 17:7.0.0-13.el9
  • qemu-kvm-core AlmaLinux 9 17:7.0.0-13.el9
  • qemu-kvm-tools AlmaLinux 9 17:7.0.0-13.el9
  • qemu-pr-helper AlmaLinux 9 17:7.0.0-13.el9
  • qemu-kvm-common AlmaLinux 9 17:7.0.0-13.el9
  • qemu-guest-agent AlmaLinux 9 17:7.0.0-13.el9
  • qemu-kvm-audio-pa AlmaLinux 9 17:7.0.0-13.el9

almalinux advisories ALSA-2022:7967

  • qemu-kvm Rocky Linux 9 7:7.0.0-13.el9

rocky linux advisories RLSA-2022:7967

  • qemu Azure Linux 3.0 8.2.0-1

azure linux advisories AZL-35150

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-3611 updated cvss 3.8

QEMU: intel-hda: segmentation fault due to stack overflow

  • Red Hat Enterprise Linux 8 Advanced Virtualization qemu-img, qemu-kvm, qemu-kiwi, qemu-kvm-core, qemu-kvm-tests, qemu-kvm-common, +9 more
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Enterprise Linux AppStream (v. 9) qemu-img 7.0.0-13.el9, qemu-kvm 7.0.0-13.el9, qemu-kvm-core 7.0.0-13.el9, qemu-kvm-tools 7.0.0-13.el9, qemu-pr-helper 7.0.0-13.el9, qemu-kvm-common 7.0.0-13.el9, +15 more
    fixed: vendor fix RHSA-2022:7967
  • Red Hat Enterprise Linux 6 qemu-img, qemu-kvm, qemu-kvm-tools, qemu-guest-agent, qemu-guest-agent-win32 Red Hat Enterprise Linux 7 qemu-img, qemu-kvm, libcacard, qemu-img-ma, qemu-kvm-ma, qemu-kvm-rhev, +6 more Red Hat Enterprise Linux 8 qemu-img, qemu-kvm, qemu-kvm-core, qemu-kvm-tests, qemu-kvm-common, qemu-guest-agent, +8 more Red Hat Enterprise Linux 8 Advanced Virtualization qemu-img, qemu-kvm, qemu-kiwi, qemu-kvm-core, qemu-kvm-tests, qemu-kvm-common, +9 more Red Hat OpenStack Platform 10 (Newton) qemu-img-rhev, qemu-kvm-rhev, qemu-kvm-tools-rhev, qemu-kvm-common-rhev Red Hat OpenStack Platform 13 (Queens) qemu-img-rhev, qemu-kvm-rhev, qemu-kvm-tools-rhev, qemu-kvm-common-rhev
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.46% chance of exploitation in the next 30 days, higher than 40% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • gitlab.com https://gitlab.com/qemu-project/qemu/-/issues/542 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 6.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
NVD 2.0 2.1 AV:L/AC:L/Au:N/C:N/I:N/A:P

Affected products

  • n/a QEMU

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
  • CWE-787 Out-of-bounds Write

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.