Bug 2428640 (CVE-2026-0665) - CVE-2026-0665 qemu-kvm: Heap off-by-one in KVM Xen PHYSDEVOP_map_pirq
Summary: CVE-2026-0665 qemu-kvm: Heap off-by-one in KVM Xen PHYSDEVOP_map_pirq
Keywords:
Status: NEW
Alias: CVE-2026-0665
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2428652 2428653
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-01-12 10:48 UTC by OSIDB Bzimport
Modified: 2026-02-06 11:11 UTC (History)
0 users

Fixed In Version:
Clone Of:
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Last Closed:
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Description OSIDB Bzimport 2026-01-12 10:48:19 UTC 
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.

Patch:
https://lore.kernel.org/qemu-devel/13FE03BE60EA78D6+20260109023548.4047-1-vr@darknavy.com/

Credit: DARKNAVY (@DarkNavyOrg)
Comment 3 Mauro Matteo Cascella 2026-02-06 11:11:13 UTC 
Upstream commit:
https://gitlab.com/qemu-project/qemu/-/commit/c7504ba2a560fd884557f6e5142f03b491aad0c7
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