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TI-2021-02850 Aliases CVE-2021-3947GHSA-435p-4r6f-2842

Out-of-bounds read in QEMU

Priority LOW 25CWE-125Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
High · None · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-125 and the CVSS impact.

Summary

A stack-buffer-overflow was found in QEMU in the NVME component. The flaw lies in nvme_changed_nslist() where a malicious guest controlling certain input can read out of bounds memory. A malicious user could use this flaw leading to disclosure of sensitive information.

Why it matters now

EPSS 0.00317 24th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

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-rc2—No fix listedCNA
  • QEMU Vendor— Affected qemu-kvm 6.2.0-rc2 Fixed in — No fix listed CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:a:qemu:qemu:*:*:*:*:*:*:*:*6.0.0 – 6.1.0VulnerableQEMU
cpe:2.3:a:qemu:qemu:6.2.0:rc0:*:*:*:*:*:*6.2.0 rc0VulnerableQEMU
cpe:2.3:a:qemu:qemu:6.2.0:rc1:*:*:*:*:*:*6.2.0 rc1VulnerableQEMU
  • cpe:2.3:a:qemu:qemu:*:*:*:*:*:*:*:* Versions 6.0.0 – 6.1.0 Vulnerable ·QEMU
  • cpe:2.3:a:qemu:qemu:6.2.0:rc0:*:*:*:*:*:* Versions 6.2.0 rc0 Vulnerable ·QEMU
  • cpe:2.3:a:qemu:qemu:6.2.0:rc1:*:*:*:*:*:* Versions 6.2.0 rc1 Vulnerable ·QEMU

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

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

Not affected: 7 products
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 8 Advanced Virtualization
  • Red Hat Enterprise Linux 9
  • Red Hat OpenStack Platform 10 (Newton)
  • Red Hat OpenStack Platform 13 (Queens)

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-3947
  2. 2026-10-03 Alias added: GHSA-435p-4r6f-2842

References

Patch 1

Advisory 2

  • TI-2024-16148 QEMU before 8.2.0 has an integer underflow, and resultant buffer overflow, via a TI… CVSS 3.1HIGH 8.8
  • TI-2022-02736 Uncontrolled resource consumption in QEMU CVSS 3.1HIGH 7.8
  • TI-2023-02681 Qemu: 9pfs: improper access control on special files CVSS 3.1HIGH 7.1
  • TI-2019-09678 The QMP migrate command in QEMU version 4.0.0 and earlier is vulnerable to OS command… CVSS 3.0CRITICAL 9.8
  • TI-2024-03326 Qemu-kvm: net: assertion failure in update_sctp_checksum() CVSS 3.1MEDIUM 5.5
  • TI-2023-22631 QEMU through 8.0.0 could trigger a division by zero in scsi_disk_reset in… CVSS 3.1MEDIUM 5.5
See all 418 →

Sources

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