CVE-2026-0665 — Out-of-bounds Write in Qemu

CWE-787 — Out-of-bounds Write8 documents7 sources
Severity
6.5MEDIUMNVD
OSV5.5
EPSS
0.0%
top 99.47%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
QemuDebian Qemu
Timeline
PublishedFeb 18
Latest updateMar 4

Description

An off-by-one error was found in QEMU's KVM Xen guest support. A malicious guest could use this flaw to trigger out-of-bounds heap accesses in the QEMU process via the emulated Xen physdev hypercall interface, leading to a denial of service or potential memory corruption.

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:HExploitability: 2.0 | Impact: 4.0

Affected Packages3 packages

▶debiandebian/qemu< qemu 1:10.2.0+ds-2 (forky)
▶Debianqemu/qemu< 1:10.0.8+ds-0+deb13u1+1
▶Ubuntuqemu/qemu< 1:6.2+dfsg-2ubuntu6.28+2

🔴Vulnerability Details

3
OSV
qemu vulnerabilities↗2026-03-04
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GHSA
GHSA-4pq4-6gr5-cr69: An off-by-one error was found in QEMU's KVM Xen guest support↗2026-02-18
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OSV
CVE-2026-0665: An off-by-one error was found in QEMU's KVM Xen guest support↗2026-02-18
▶

📋Vendor Advisories

3
Ubuntu
QEMU vulnerabilities↗2026-03-04
▶
Red Hat
qemu-kvm: Heap off-by-one in KVM Xen PHYSDEVOP_map_pirq↗2026-01-09
▶
Debian
CVE-2026-0665: qemu - An off-by-one error was found in QEMU's KVM Xen guest support. A malicious guest...↗2026
▶

🕵️Threat Intelligence

1
Wiz
CVE-2026-0665 Impact, Exploitability, and Mitigation Steps | Wiz↗
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