Home/CVE/An off-by-one error was found in the SCSI device emulation in QEMU. It could occur while processing MODE SELECT commands
CVE

CVE-2021-3930

An off-by-one error was found in the SCSI device emulation in QEMU. It could occur while processing MODE SELECT commands

An off-by-one error was found in the SCSI device emulation in QEMU. It could occur while processing MODE SELECT commands in mode_sense_page() if the 'page' argument was set to MODE_PAGE_ALLS (0x3f). A malicious guest could use this flaw to potentially crash QEMU, resulting in a denial of service condition.

MEDIUM · CVSS 6.5 EPSS 0.00054
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules1 YARA rules0
⬡

Weakness Classification

CWE-193Off-by-one Error
CWE-193Off-by-one Error
▤

Affected Products & Versions

10
qemu< 6.2.0
redhat codeready linux builderall versions
redhat codeready linux builder for ibm z systemsall versions
redhat codeready linux builder for power little endianall versions
redhat openstackall versions
redhat enterprise linuxall versions
redhat enterprise linux advanced virtualization eusall versions
redhat enterprise linux for ibm z systemsall versions
◈

Sigma Hunt Rules

1
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
productmediumPotentially Suspicious Usage Of Qemu
▣

Scoring & Timeline

6.5
MEDIUM · CVSS v3.1 · secalert@redhat.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD18 Feb 2022 · 06:15 PM
CVSS VectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
⚑

Vendor Advisories

11
msrcCVE-2021-3930
usnUSN-5772-1
suse-csafSUSE-SU-2022:0930-2
suse-csafSUSE-SU-2022:1151-1
suse-csafopenSUSE-SU-2022:0930-1
🔗

References & Sources

5
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://bugzilla.redhat.com/show_bug.cgi?id=2020588Issue TrackingPatchVendor Advisory
https://lists.debian.org/debian-lts-announce/2022/04/msg00002.htmlMailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2022/09/msg00008.htmlMailing ListThird Party Advisory
https://security.gentoo.org/glsa/202208-27Third Party Advisory
https://security.netapp.com/advisory/ntap-20220225-0007/Third Party Advisory
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