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TI-2021-02837 Aliases CVE-2021-3930GHSA-2v9g-p8fq-vvh2

An off-by-one error was found in the SCSI device emulation in QEMU.

Priority LOW 29CWE-193Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 4 fixed, 5 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-193 and the CVSS impact.

Summary

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.

Why it matters now

EPSS 0.00338 27th percentileScored 2026-11-07
Fix Partial Red Hat: 3 advisoriesRed Hat: 4 fixed, 5 without a fix

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
—QEMUqemu-kvm 6.2.0-rc0—No fix listedCNA
  • QEMU Vendor— Affected qemu-kvm 6.2.0-rc0 Fixed in — No fix listed CNA

CPE configurations NVD · 12

CPEVersionsRoleVendor
cpe:2.3:a:qemu:qemu:*:*:*:*:*:*:*:*before 6.2.0VulnerableQEMU
cpe:2.3:a:redhat:codeready_linux_builder:8.0:*:*:*:*:*:*:*8.0VulnerableRed Hat
cpe:2.3:a:redhat:codeready_linux_builder_for_ibm_z_systems:8.0:*:*:*:*:*:*:*8.0VulnerableRed Hat
cpe:2.3:a:redhat:codeready_linux_builder_for_power_little_endian:8.0:*:*:*:*:*:*:*8.0VulnerableRed Hat
cpe:2.3:a:redhat:openstack:10:*:*:*:*:*:*:*10VulnerableRed Hat
cpe:2.3:a:redhat:openstack:13:*:*:*:*:*:*:*13VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*8.0VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_advanced_virtualization_eus:8.4:*:*:*:*:*:*:*8.4VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems:8.0:*:*:*:*:*:*:*8.0VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian:8.0:*:*:*:*:*:*:*8.0VulnerableRed Hat
  • cpe:2.3:a:qemu:qemu:*:*:*:*:*:*:*:* Versions before 6.2.0 Vulnerable ·QEMU
  • cpe:2.3:a:redhat:codeready_linux_builder:8.0:*:*:*:*:*:*:* Versions 8.0 Vulnerable ·Red Hat
  • cpe:2.3:a:redhat:codeready_linux_builder_for_ibm_z_systems:8.0:*:*:*:*:*:*:* Versions 8.0 Vulnerable ·Red Hat
  • cpe:2.3:a:redhat:codeready_linux_builder_for_power_little_endian:8.0:*:*:*:*:*:*:* Versions 8.0 Vulnerable ·Red Hat
  • cpe:2.3:a:redhat:openstack:10:*:*:*:*:*:*:* Versions 10 Vulnerable ·Red Hat
  • cpe:2.3:a:redhat:openstack:13:*:*:*:*:*:*:* Versions 13 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* Versions 8.0 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_advanced_virtualization_eus:8.4:*:*:*:*:*:*:* Versions 8.4 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems:8.0:*:*:*:*:*:*:* Versions 8.0 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian:8.0:*:*:*:*:*:*:* Versions 8.0 Vulnerable ·Red Hat
Show 2 more CPE
CPEVersionsRoleVendor
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*9.0VulnerableDebian
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*10.0VulnerableDebian
  • cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Debian
  • cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* Versions 10.0 Vulnerable ·Debian

Remediation

Red Hat 3 advisories

  • RHSA-2022:0081 Released 2022-01-11 · Red Hat rating Low
    virt:av and virt-devel:av security and bug fix update
    • Advanced Virtualization for RHEL 8.5.0.Z SLOF-20210217-1.module+el8.5.0+10946+35bb3930.noarch::virt:av, SLOF-20210217-1.module+el8.5.0+10946+35bb3930.src::virt-devel:av, SLOF-20210217-1.module+el8.5.0+10946+35bb3930.src::virt:av +47
  • RHSA-2021:5238 Released 2021-12-21 · Red Hat rating Low
    virt:rhel and virt-devel:rhel security update
    • Red Hat CodeReady Linux Builder (v. 8) SLOF-20191022-3.git899d9883.module+el8.3.0+6423+e4cb6418.src::virt-devel:rhel, hivex-1.3.18-21.module+el8.5.0+10709+b3edb581.i686::virt-devel:rhel, hivex-devel-1.3.18-21.module+el8.5.0+10709+b3edb581.i686::virt-devel:rhel +47
    • Red Hat Enterprise Linux AppStream (v. 8) SLOF-20191022-3.git899d9883.module+el8.3.0+6423+e4cb6418.noarch::virt:rhel, SLOF-20191022-3.git899d9883.module+el8.3.0+6423+e4cb6418.src::virt:rhel, hivex-1.3.18-21.module+el8.5.0+10709+b3edb581.aarch64::virt:rhel +47
  • RHSA-2021:5065 Released 2021-12-09 · Red Hat rating Low
    virt:av and virt-devel:av security, bug fix, and enhancement update
    • Advanced Virtualization for RHEL 8.4.0.EUS SLOF-20200717-1.gite18ddad8.module+el8.4.0+8855+a9e237a9.noarch::virt:av, SLOF-20200717-1.gite18ddad8.module+el8.4.0+8855+a9e237a9.src::virt-devel:av, SLOF-20200717-1.gite18ddad8.module+el8.4.0+8855+a9e237a9.src::virt:av +47

Vendor assessments

Red Hat

Red Hat rating: Low. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 7AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 8 Advanced VirtualizationAffectedNo fix yet
Red Hat OpenStack Platform 10 (Newton)AffectedNo fix planned: Out of support scope
Red Hat OpenStack Platform 13 (Queens)AffectedNo fix planned: Out of support scope
Advanced Virtualization for RHEL 8.4.0.EUSFixed RHSA-2021:5065
Advanced Virtualization for RHEL 8.5.0.ZFixed RHSA-2022:0081
Red Hat CodeReady Linux Builder (v. 8)Fixed RHSA-2021:5238
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2021:5238
Not affected: 1 product
  • Red Hat Enterprise Linux 9

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-3930
  2. 2026-10-03 Alias added: GHSA-2v9g-p8fq-vvh2

References

Patch 1

Advisory 4

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences