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Fencer Vulns
low 3.9

CVE-2020-29443 json

ide_atapi_cmd_reply_end in hw/ide/atapi.c in QEMU 5.1.0 allows out-of-bounds read access because a buffer index is not validated.

published 2021-01-22 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-21816

cvss
3.9
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

ide_atapi_cmd_reply_end in hw/ide/atapi.c in QEMU 5.1.0 allows out-of-bounds read access because a buffer index is not validated.

Patch / fix

  • qemu Debian 14, Debian 13, Debian 12 1:5.2+dfsg-11

debian advisories DEBIAN-CVE-2020-29443

  • qemu Ubuntu 16.04 LTS 1:2.5+dfsg-5ubuntu10.49
  • qemu Ubuntu 18.04 LTS 1:2.11+dfsg-1ubuntu7.35
  • qemu Ubuntu 20.04 LTS 1:4.2-3ubuntu6.12
  • qemu Ubuntu Pro 14.04 LTS 2.0.0+dfsg-2ubuntu1.47+esm6

ubuntu advisories UBUNTU-CVE-2020-29443

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

  • SLOF RHEL 8 20191022-3.git899d9883.module+el8.3.0+6423+e4cb6418
  • hivex RHEL 8 1.3.18-20.module+el8.3.0+6423+e4cb6418
  • netcf RHEL 8 0.2.8-12.module+el8.1.0+4066+0f1aadab
  • libnbd RHEL 8 1.2.2-1.module+el8.3.0+7353+9de0a3cc
  • nbdkit RHEL 8 1.16.2-4.module+el8.3.0+6922+fd575af8
  • libvirt RHEL 8 6.0.0-35.module+el8.4.0+10230+7a9b21e4
  • nbdfuse RHEL 8 1.2.2-1.module+el8.3.0+7353+9de0a3cc
  • seabios RHEL 8 1.13.0-2.module+el8.3.0+7353+9de0a3cc

red hat advisories RHSA-2021:1762RHBA-2021:0639RHSA-2021:2322RHSA-2021:2529

  • 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

  • hivex AlmaLinux 8 1.3.18-20.module_el8.3.0+2048+e7a0a3ea
  • netcf AlmaLinux 8 0.2.8-12.module_el8.5.0+2608+72063365
  • netcf AlmaLinux 8 0.2.8-12.module_el8.6.0+2880+7d9e3703
  • netcf AlmaLinux 8 0.2.8-12.module_el8.3.0+2048+e7a0a3ea
  • libnbd AlmaLinux 8 1.2.2-1.module_el8.5.0+2608+72063365
  • libnbd AlmaLinux 8 1.2.2-1.module_el8.3.0+2048+e7a0a3ea
  • nbdkit AlmaLinux 8 1.16.2-4.module_el8.5.0+2608+72063365
  • nbdfuse AlmaLinux 8 1.2.2-1.module_el8.3.0+2048+e7a0a3ea

almalinux advisories ALSA-2021:1762

  • hivex Rocky Linux 8 1.3.18-20.module+el8.4.0+534+4680a14e
  • netcf Rocky Linux 8 0.2.8-12.module+el8.7.0+1084+97b81f61
  • netcf Rocky Linux 8 0.2.8-12.module+el8.4.0+534+4680a14e
  • netcf Rocky Linux 8 0.2.8-12.module+el8.6.0+847+b490afdd
  • libnbd Rocky Linux 8 1.2.2-1.module+el8.4.0+534+4680a14e
  • nbdkit Rocky Linux 8 1.16.2-4.module+el8.4.0+534+4680a14e
  • libvirt Rocky Linux 8 6.0.0-35.module+el8.4.0+534+4680a14e
  • seabios Rocky Linux 8 1.13.0-2.module+el8.4.0+534+4680a14e

rocky linux advisories RLSA-2021:1762

  • qemu Alpine 3.24, Alpine 3.23, Alpine 3.22 +6 more 5.2.0-r0

alpine advisories ALPINE-CVE-2020-29443

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

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-2020-29443 updated cvss 3.9

QEMU: ide: atapi: OOB access while processing read commands

  • Red Hat Enterprise Linux 6 qemu-img, qemu-kvm, qemu-kvm-tools, qemu-guest-agent, qemu-guest-agent-win32
    affected: no fix planned “Out of support scope”
  • 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: no fix planned “Will not fix”
  • Red Hat Advanced Virtualization CodeReady Builder for RHEL 8.3.1 libnbd 1.4.0-2.module+el8.3.0+7998+6ff5e5ab, netcf 0.2.8-12.module+el8.3.0+6124+819ee737, hivex 1.3.18-20.module+el8.3.0+6124+819ee737, nbdfuse 1.4.0-2.module+el8.3.0+7998+6ff5e5ab, libvirt 6.6.0-13.module+el8.3.1+9548+0a8fede5, seabios 1.14.0-1.module+el8.3.0+7638+07cf13d2, +40 more Red Hat Advanced Virtualization for RHEL 8.3.1 libnbd 1.4.0-2.module+el8.3.0+7998+6ff5e5ab, netcf 0.2.8-12.module+el8.3.0+6124+819ee737, hivex 1.3.18-20.module+el8.3.0+6124+819ee737, nbdfuse 1.4.0-2.module+el8.3.0+7998+6ff5e5ab, nbdkit 1.22.0-2.module+el8.3.0+8203+18ecf00e, libvirt 6.6.0-13.module+el8.3.1+9548+0a8fede5, +103 more
    fixed: vendor fix RHBA-2021:0639
  • Red Hat CodeReady Linux Builder (v. 8) libnbd 1.2.2-1.module+el8.3.0+7353+9de0a3cc, netcf 0.2.8-12.module+el8.1.0+4066+0f1aadab, hivex 1.3.18-20.module+el8.3.0+6423+e4cb6418, nbdfuse 1.2.2-1.module+el8.3.0+7353+9de0a3cc, seabios 1.13.0-2.module+el8.3.0+7353+9de0a3cc, libiscsi 1.18.0-8.module+el8.1.0+4066+0f1aadab, +39 more Red Hat Enterprise Linux AppStream (v. 8) libnbd 1.2.2-1.module+el8.3.0+7353+9de0a3cc, netcf 0.2.8-12.module+el8.1.0+4066+0f1aadab, hivex 1.3.18-20.module+el8.3.0+6423+e4cb6418, nbdfuse 1.2.2-1.module+el8.3.0+7353+9de0a3cc, nbdkit 1.16.2-4.module+el8.3.0+6922+fd575af8, seabios 1.13.0-2.module+el8.3.0+7353+9de0a3cc, +88 more
    fixed: vendor fix RHSA-2021:1762
  • Red Hat Enterprise Linux Client (v. 7) qemu-img 1.5.3-175.el7_9.4, qemu-kvm 1.5.3-175.el7_9.4, qemu-kvm-tools 1.5.3-175.el7_9.4, qemu-kvm-common 1.5.3-175.el7_9.4 Red Hat Enterprise Linux ComputeNode Optional (v. 7) qemu-img 1.5.3-175.el7_9.4, qemu-kvm 1.5.3-175.el7_9.4, qemu-kvm-tools 1.5.3-175.el7_9.4, qemu-kvm-common 1.5.3-175.el7_9.4 Red Hat Enterprise Linux Server (v. 7) qemu-img 1.5.3-175.el7_9.4, qemu-kvm 1.5.3-175.el7_9.4, qemu-kvm-tools 1.5.3-175.el7_9.4, qemu-kvm-common 1.5.3-175.el7_9.4 Red Hat Enterprise Linux Workstation (v. 7) qemu-img 1.5.3-175.el7_9.4, qemu-kvm 1.5.3-175.el7_9.4, qemu-kvm-tools 1.5.3-175.el7_9.4, qemu-kvm-common 1.5.3-175.el7_9.4
    fixed: vendor fix RHSA-2021:2322
  • Red Hat Virtualization 4 Management Agent for RHEL 7 Hosts qemu-img-rhev 2.12.0-48.el7_9.3, qemu-kvm-rhev 2.12.0-48.el7_9.3, qemu-kvm-tools-rhev 2.12.0-48.el7_9.3, qemu-kvm-common-rhev 2.12.0-48.el7_9.3 Red Hat RHV-M 4.3 qemu-img-rhev 2.12.0-48.el7_9.3, qemu-kvm-rhev 2.12.0-48.el7_9.3, qemu-kvm-tools-rhev 2.12.0-48.el7_9.3, qemu-kvm-common-rhev 2.12.0-48.el7_9.3
    fixed: vendor fix RHSA-2021:2529
  • Red Hat Enterprise Linux 5 kvm, xen Red Hat Enterprise Linux 7 qemu-img-ma, qemu-kvm-ma, qemu-kvm-tools-ma, qemu-kvm-common-ma
    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

0.38% 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 3.9 CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:L/I:N/A:L
NVD 2.0 3.3 AV:L/AC:M/Au:N/C:P/I:N/A:P

Classification

Weakness

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.