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Fencer Vulns
low 3.8

CVE-2020-12829 json

In QEMU through 5.0.0, an integer overflow was found in the SM501 display driver implementation.

published 2020-08-31 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-5111

cvss
3.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 31%
public exploits
0
none known

Summary

In QEMU through 5.0.0, an integer overflow was found in the SM501 display driver implementation. This flaw occurs in the COPY_AREA macro while handling MMIO write operations through the sm501_2d_engine_write() callback. A local attacker could abuse this flaw to crash the QEMU process in sm501_2d_operation() in hw/display/sm501.c on the host, resulting in a denial of service.

Patch / fix

  • qemu Debian 14, Debian 13, Debian 12 1:5.0-12

debian advisories DEBIAN-CVE-2020-12829

  • qemu Ubuntu 16.04 LTS 1:2.5+dfsg-5ubuntu10.45
  • qemu Ubuntu 18.04 LTS 1:2.11+dfsg-1ubuntu7.31
  • qemu Ubuntu 20.04 LTS 1:4.2-3ubuntu6.4
  • qemu Ubuntu Pro 14.04 LTS 2.0.0+dfsg-2ubuntu1.47+esm6

ubuntu advisories UBUNTU-CVE-2020-12829

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

  • kvm SLE Point of Sale 11 SP3 1.4.2-53.38.1
  • qemu SLES 12 SP2-BCL 2.6.2-41.62.1
  • qemu SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLES 15 SP1-BCL +6 more 3.1.1.1-9.24.3
  • qemu SLES for SAP 15, SLES 15-LTSS, SLE High Performance Computing 15-LTSS +1 more 2.11.2-9.43.1
  • qemu SLE Module for Server Applications 15 SP2, SLE Module for Basesystem 15 SP2, SLE Micro 5.0 4.2.1-11.16.3
  • qemu SLES for SAP 12 SP5, SLES 12 SP5 3.1.1.1-48.2
  • qemu SLES for SAP 12 SP4, SLES 12 SP4-LTSS, OpenStack Cloud Crowbar 9 +1 more 2.11.2-5.29.1
  • qemu SLES for SAP 12 SP3, SLES 12 SP3-LTSS, SLES 12 SP3-BCL +3 more 2.9.1-6.47.1

suse advisories SUSE-SU-2021:14706-1SUSE-SU-2021:1305-1SUSE-SU-2021:14704-1SUSE-SU-2021:1245-1SUSE-SU-2021:1244-1SUSE-SU-2021:1243-1

  • qemu openSUSE Leap 15.2 4.2.1-lp152.9.12.1
  • qemu-testsuite openSUSE Leap 15.2 4.2.1-lp152.9.12.1
  • qemu-linux-user openSUSE Leap 15.2 4.2.1-lp152.9.12.1

opensuse advisories openSUSE-SU-2021:0600-1

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-2020-12829 updated cvss 3.8

qemu: OOB read and write due to integer overflow in sm501_2d_operation() in hw/display/sm501.c

  • Red Hat Enterprise Linux 5 kvm, xen 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
    +1 more products
    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

0.37% chance of exploitation in the next 30 days, higher than 31% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 3.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:L
NVD 2.0 2.1 AV:L/AC:L/Au:N/C:N/I:N/A:P

Classification

Weakness
  • CWE-190 Integer Overflow or Wraparound

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.