Vulnerability in qemu
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as DEBIAN-CVE-2021-3750 has been found in qemu.
Successful exploitation can lead to full system takeover.
What to do: upgrade qemu to 1:7.0+dfsg-1 or later.
If unsure, ask your IT team or search "qemu DEBIAN-CVE-2021-3750" on the vendor's site.
DEBIAN-CVE-2021-3750 (qemu)
Attack vector: local / no user interaction
Patched: 1:7.0+dfsg-1 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (unclassified) exists in qemu.
Check the vendor advisory for the affected versions of qemu.
Severity: ?. Successful exploitation can lead to full system takeover.
Update to 1:7.0+dfsg-1.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'qemu' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1
Identify exposureidentify
grep -r 'qemu' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
qemuを grep し、稼働しているサービス・バージョンを把握する。 -
2
Apply patchpatch
Upgrade qemu to 1:7.0+dfsg-1ステージング環境で 1:7.0+dfsg-1 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
3
Post-deployment verificationverify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
| Ecosystem | Package | Affected | Fixed |
|---|---|---|---|
| Debian:12 | qemu |
< 1:7.0+dfsg-1 |
1:7.0+dfsg-1 |
| Debian:13 | qemu |
< 1:7.0+dfsg-1 |
1:7.0+dfsg-1 |
| Debian:14 | qemu |
< 1:7.0+dfsg-1 |
1:7.0+dfsg-1 |
Original description The description as published by the source.
A DMA reentrancy issue was found in the USB EHCI controller emulation of QEMU. EHCI does not verify if the Buffer Pointer overlaps with its MMIO region when it transfers the USB packets. Crafted content may be written to the controller's registers and trigger undesirable actions (such as reset) while the device is still transferring packets. This can ultimately lead to a use-after-free issue. A malicious guest could use this flaw to crash the QEMU process on the host, resulting in a denial of service condition, or potentially execute arbitrary code within the context of the QEMU process on the host. This flaw affects QEMU versions before 7.0.0.
Source: OSV.dev (Open Source Vulnerabilities) OSV
References
- advisory security-tracker.debian.org