High [CVE-2026-31786] Buffer overflow in drivers/xen/sys-hypervisor.c
This high-severity Red Hat Linux advisory covers CVE-2026-31786 affecting Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 1.
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Summary
Buffer overflow in drivers/xen/sys-hypervisor.c. Red Hat rates this moderate (CVSS 7.1).
Weakness: CWE-170. Affected package(s): kernel, kernel-rt.
Resolved in Red Hat advisory RHSA-2026:27288 — update the affected packages (`sudo dnf update`).
Affected products named by the advisory: Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 1.
- kernel-0:5.14.0-687.13.1.el9_8
- kernel-0:4.18.0-553.134.1.el8_10
- kernel-0:6.12.0-211.26.1.el10_2
- kernel-rt-0:4.18.0-553.134.1.rt7.475.el8_10
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
- RHSA-2026:27288
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
Mitigation checklist
- Update the affected package(s) to the fixed version shipped in RHSA-2026:27288 (`sudo dnf update` / `yum update`).
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
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