CVE-2026-0665: Qemu-kvm: heap off-by-one in kvm xen physdevop_map_pirq
Vulnerability summary
CVE-2026-0665 is a medium (CVSS 6.5) Out-of-bounds Write vulnerability in qemu. EPSS estimates a 0.17% chance of exploitation in the next 30 days, higher than 6% of scored vulnerabilities.
Not severe (CVSS 6.5, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 7 · Related 7Timeline
- 18-02-2026PublishedVulnerability first disclosed.
- 18-02-2026Last modifiedVulnerability information updated.
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 metrics
4 scores · 4 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
- NVDNIST6.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
EPSS trend
Probability
0.17%
Chance of exploitation in the next 30 days
Percentile
6%
Versus all other CVEs
30-day change
Increase +0.01 pp
From 0.15% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Suse4 products
- qemu-linux-user&distro=SUSE Linux Enterprise Module for Package Hub 15 SP7< 9.2.4-150700.3.14.1
- qemu&distro=SUSE Linux Enterprise Module for Basesystem 15 SP7< 9.2.4-150700.3.14.1
- qemu&distro=SUSE Linux Enterprise Module for Package Hub 15 SP7< 9.2.4-150700.3.14.1
- qemu&distro=SUSE Linux Enterprise Module for Server Applications 15 SP7< 9.2.4-150700.3.14.1
Debian1 product
- qemu< 1:10.0.8+ds-0+deb13u1 | < 1:10.2.0+ds-2
Opensuse1 product
- qemu&distro=openSUSE Tumbleweed< 10.2.0-2.1
Ubuntu1 product
- qemu< 1:8.2.2+ds-0ubuntu1.13 | < 1:10.1.0+ds-5ubuntu2.4
4 vendors · 7 products
