Buffer overflow in Red Hat Enterprise Linux 10
CVE-2026-0665
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.
Vulnerability class: Buffer Overflow
EPSS: 0.001 (4.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H.
Affected products
Weakness classification (CWE)
References
- patrick@puiterwijk.org (x_refsource_REDHAT, vdb-entry)
- patrick@puiterwijk.org (x_refsource_REDHAT, issue-tracking)
Frequently asked questions
- What is CVE-2026-0665?
- CVE-2026-0665 is a medium-severity vulnerability in Red Hat Enterprise Linux 10, classified under Out-of-bounds Write. CVSS score: 6.5/10. Published 2026-02-18.
- How severe is CVE-2026-0665?
- Medium severity. CVSS v3 base score is 6.5 out of 10.