CVE-2021-20196: debian debian_linux NULL Pointer Dereference

Modified

AliasesSUSE-SU-2022:0177-1RHSA-2022:0325UBUNTU-CVE-2021-20196+3 more

Published 26-05-2021Last modified 03-08-2024

Vulnerability summary

CVE-2021-20196 is a medium (CVSS 6.5) NULL Pointer Dereference vulnerability in debian debian_linux. EPSS estimates a 0.48% chance of exploitation in the next 30 days, higher than 41.3% of scored vulnerabilities. 1 public exploit is recorded.

Priority

Routine

Not severe (CVSS 6.5, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?

CVSS score

6.5/10

010

Medium · v3.1 (NVD)

EPSS score

0.48%

0%100%

Low · 0.00 pp in 30 days

KEVNot listedNot listed by any tracked catalog.

RansomwareNot flaggedNo ransomware use recorded.

Public exploits1reference

Advisory lineage

Upstream 0 · Downstream 9 · Related 6

DLA-2970-1 DLA-3099-1 OPENSUSE-SU-2022:0210-1 RHSA-2022:0397 RHSA-2022:1759 SUSE-SU-2022:0210-1+4 more

Timeline

26-05-2021
PublishedVulnerability first disclosed.
03-08-2024
Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

6 scores · 5 sources · 2 versions

v3.16.5v2.02.1

EPSS trend

Probability

0.48%

Chance of exploitation in the next 30 days

Percentile

41%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.48% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs

CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

1 found

referenceUnverified
Exploit Reference (bugs.launchpad.net)
Maturity: unknown

Weaknesses

CWE · root cause

CWE-476NULL Pointer DereferenceThe product dereferences a pointer that it expects to be valid but is NULL.

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Redhat191 products

hivex< 0:1.3.18-21.module+el8.4.0+11609+2eba841a
hivex-debuginfo< 0:1.3.18-21.module+el8.4.0+11609+2eba841a
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libguestfs< 1:1.44.0-2.module+el8.4.0+10146+75917d2f

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libvirt-daemon-driver-network< 0:7.0.0-14.6.module+el8.4.0+13801+378af433
libvirt-daemon-driver-network-debuginfo< 0:7.0.0-14.6.module+el8.4.0+13801+378af433
libvirt-daemon-driver-nodedev< 0:7.0.0-14.6.module+el8.4.0+13801+378af433
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libvirt-daemon-driver-nwfilter< 0:7.0.0-14.6.module+el8.4.0+13801+378af433
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libvirt-daemon-driver-qemu< 0:7.0.0-14.6.module+el8.4.0+13801+378af433
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libvirt-daemon-driver-secret< 0:7.0.0-14.6.module+el8.4.0+13801+378af433
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libvirt-daemon-driver-storage< 0:7.0.0-14.6.module+el8.4.0+13801+378af433
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libvirt-daemon-driver-storage-iscsi< 0:7.0.0-14.6.module+el8.4.0+13801+378af433
libvirt-daemon-driver-storage-iscsi-debuginfo< 0:7.0.0-14.6.module+el8.4.0+13801+378af433
libvirt-daemon-driver-storage-iscsi-direct< 0:7.0.0-14.6.module+el8.4.0+13801+378af433
libvirt-daemon-driver-storage-iscsi-direct-debuginfo< 0:7.0.0-14.6.module+el8.4.0+13801+378af433
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libvirt-daemon-driver-storage-logical-debuginfo< 0:7.0.0-14.6.module+el8.4.0+13801+378af433
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libvirt-daemon-driver-storage-rbd< 0:7.0.0-14.6.module+el8.4.0+13801+378af433
libvirt-daemon-driver-storage-rbd-debuginfo< 0:7.0.0-14.6.module+el8.4.0+13801+378af433
libvirt-daemon-driver-storage-scsi< 0:7.0.0-14.6.module+el8.4.0+13801+378af433
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nbdkit-curl-plugin-debuginfo< 0:1.24.0-1.module+el8.4.0+9341+96cf2672
nbdkit-debuginfo< 0:1.24.0-1.module+el8.4.0+9341+96cf2672
nbdkit-debugsource< 0:1.24.0-1.module+el8.4.0+9341+96cf2672
nbdkit-devel< 0:1.24.0-1.module+el8.4.0+9341+96cf2672
nbdkit-example-plugins< 0:1.24.0-1.module+el8.4.0+9341+96cf2672
nbdkit-example-plugins-debuginfo< 0:1.24.0-1.module+el8.4.0+9341+96cf2672
nbdkit-gzip-filter< 0:1.24.0-1.module+el8.4.0+9341+96cf2672
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nbdkit-nbd-plugin< 0:1.24.0-1.module+el8.4.0+9341+96cf2672
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ocaml-hivex< 0:1.3.18-21.module+el8.4.0+11609+2eba841a
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ocaml-libguestfs-devel< 1:1.44.0-2.module+el8.4.0+10146+75917d2f
ocaml-libnbd< 0:1.6.0-3.module+el8.4.0+9856+bbc47853
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python3-libguestfs< 1:1.44.0-2.module+el8.4.0+10146+75917d2f
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qemu-kvm-block-gluster< 15:5.2.0-16.module+el8.4.0+13742+d494501f.14
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qemu-kvm-block-iscsi< 15:5.2.0-16.module+el8.4.0+13742+d494501f.14
qemu-kvm-block-iscsi-debuginfo< 15:5.2.0-16.module+el8.4.0+13742+d494501f.14
qemu-kvm-block-rbd< 15:5.2.0-16.module+el8.4.0+13742+d494501f.14
qemu-kvm-block-rbd-debuginfo< 15:5.2.0-16.module+el8.4.0+13742+d494501f.14
qemu-kvm-block-ssh< 15:5.2.0-16.module+el8.4.0+13742+d494501f.14
qemu-kvm-block-ssh-debuginfo< 15:5.2.0-16.module+el8.4.0+13742+d494501f.14

Show all 191

Opensuse3 products

qemu-linux-user&distro=openSUSE Leap 15.3< 5.2.0-150300.109.2
qemu-testsuite&distro=openSUSE Leap 15.3< 5.2.0-150300.109.4
qemu&distro=openSUSE Leap 15.3< 5.2.0-150300.109.2

Debian2 products

qemu< 1:6.2+dfsg-1
debian_linuxEOL9.0 | 10.0

Ubuntu2 products

qemu< 2.0.0+dfsg-2ubuntu1.47+esm6 | < 1:2.5+dfsg-5ubuntu10.51+esm4 | < 1:2.11+dfsg-1ubuntu7.39 | < 1:4.2-3ubuntu6.21 | < 1:6.2+dfsg-2ubuntu5
xenAll versions (No fix recorded)

Alpine1 product

qemu< 6.1.1-r0

Qemu1 product

qemu5.2.0

6 vendors · 200 products · Showing 200 of 246

References

23 links

bugs.launchpad.net/qemu/+bug/1912780X Refsource MISCARTICLEExploitPatchThird Party Advisory
www.openwall.com/lists/oss-security/2021/01/28/1X Refsource MISCARTICLEREPORTMailing ListPatchThird Party Advisory
security.netapp.com/advisory/ntap-20210708-0004/X Refsource CONFIRMThird Party Advisory
lists.debian.org/debian-lts-announce/2022/04/msg00002.htmlMailing ListX Refsource MLISTThird Party Advisory
lists.debian.org/debian-lts-announce/2022/09/msg00008.htmlMailing ListX Refsource MLISTThird Party Advisory
www.suse.com/support/update/announcement/2022/suse-su-20220177-1/Advisory
bugzilla.suse.com/1181361REPORT
www.suse.com/security/cve/CVE-2021-20196WEB
access.redhat.com/errata/RHSA-2022:0325Advisory
access.redhat.com/security/updates/classification/ARTICLE

Show all 23 references

bugzilla.redhat.com/show_bug.cgi?id=1919210REPORT
bugzilla.redhat.com/show_bug.cgi?id=2034942REPORT
security.access.redhat.com/data/csaf/v2/advisories/2022/rhsa-2022_0325.jsonAdvisory
access.redhat.com/security/cve/CVE-2021-20196REPORT
www.cve.org/CVERecord?id=CVE-2021-20196AdvisoryREPORT
nvd.nist.gov/vuln/detail/CVE-2021-20196Advisory
ubuntu.com/security/CVE-2021-20196REPORT
lists.nongnu.org/archive/html/qemu-devel/2021-01/msg05986.htmlREPORT
ubuntu.com/security/notices/USN-5307-1Advisory
ubuntu.com/security/notices/USN-8412-1Advisory
security-tracker.debian.org/tracker/CVE-2021-20196Advisory
lists.opensuse.org/archives/…Advisory
security.alpinelinux.org/vuln/CVE-2021-20196Advisory