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TI-2021-02466 Aliases CVE-2021-3507GHSA-m99h-7jcp-j7w9

Memory corruption in QEMU

Priority LOW 28CWE-119Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · None · Low
Fix status
Partial Red Hat: 3 fixed, 5 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat.

Summary

A heap buffer overflow was found in the floppy disk emulator of QEMU up to 6.0.0 (including). It could occur in fdctrl_transfer_handler() in hw/block/fdc.c while processing DMA read data transfers from the floppy drive to the guest system. A privileged guest user could use this flaw to crash the QEMU process on the host resulting in DoS scenario, or potential information leakage from the host memory.

Why it matters now

EPSS 0.00489 42nd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial Red Hat: 2 advisoriesRed Hat: 3 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
—QEMUup to 6.0.0 (including)—No fix listedCNA
  • QEMU Vendor— Affected up to 6.0.0 (including) Fixed in — No fix listed CNA

CPE configurations NVD · 4

CPEVersionsRoleVendor
cpe:2.3:a:qemu:qemu:*:*:*:*:*:*:*:*up to 6.0.0VulnerableQEMU
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*10.0VulnerableDebian
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:-:*:*:*8.0VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:advanced_virtualization:*:*:*8.0VulnerableRed Hat
  • cpe:2.3:a:qemu:qemu:*:*:*:*:*:*:*:* Versions up to 6.0.0 Vulnerable ·QEMU
  • cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* Versions 10.0 Vulnerable ·Debian
  • cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:-:*:*:* Versions 8.0 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:advanced_virtualization:*:*:* Versions 8.0 Vulnerable ·Red Hat

Remediation

Red Hat 2 advisories

  • RHSA-2022:7967 Released 2022-11-15 · Red Hat rating Moderate
    qemu-kvm security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 9) qemu-guest-agent-17:7.0.0-13.el9, qemu-img-17:7.0.0-13.el9, qemu-kvm-17:7.0.0-13.el9 +19
  • RHSA-2022:7472 Released 2022-11-08 · Red Hat rating Low
    virt:rhel and virt-devel:rhel security, bug fix, and enhancement update
    • Red Hat CodeReady Linux Builder (v. 8) SLOF-20210217-1.module+el8.7.0+16689+53d59bc2.src::virt-devel:rhel, hivex-1.3.18-23.module+el8.7.0+16689+53d59bc2.i686::virt-devel:rhel, hivex-devel-1.3.18-23.module+el8.7.0+16689+53d59bc2.i686::virt-devel:rhel +47
    • Red Hat Enterprise Linux AppStream (v. 8) SLOF-20210217-1.module+el8.7.0+16689+53d59bc2.noarch::virt:rhel, SLOF-20210217-1.module+el8.7.0+16689+53d59bc2.src::virt:rhel, hivex-1.3.18-23.module+el8.7.0+16689+53d59bc2.aarch64::virt:rhel +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: Fix deferred
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
Red Hat CodeReady Linux Builder (v. 8)Fixed RHSA-2022:7472
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2022:7472
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2022:7967

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-3507
  2. 2026-10-03 Alias added: GHSA-m99h-7jcp-j7w9

References

Exploit 1

Advisory 2

Sources

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