# CVE-2025-27466: xen: This update for xen fixes the following issues:  Security issues fixed:          - CVE-2025-27466: NULL pointer deref...

CVE-2025-27466 is fixed in xen on 1 platform, first by SUSE-SU-2025:03172-1, released September 11, 2025. It is not reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/cve/CVE-2025-27466
- Priority: Urgent
- CVSS: 9.8 (critical)
- EPSS: 0.0049
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 11, 2025

## Description

This update for xen fixes the following issues:  Security issues fixed:          - CVE-2025-27466: NULL pointer dereference in the Viridian interface when updating the reference TSC area (bsc#1248807). - CVE-2025-58142: NULL pointer dereference in the Viridian interface due to assumption that the SIM page is mapped when   a synthetic timer message has to be delivered (bsc#1248807). - CVE-2025-58143: information leak and reference counter underflow in the Viridian interface due to race in the mapping   of the reference TSC page (bsc#1248807).  Other issues fixed:      - efi: Call FreePages() only if needed (bsc#1027519). - x86/hpet: do local APIC EOI after interrupt processing (bsc#1027519). - x86/hvm/ioreq: Fix condition in hvm_alloc_legacy_ioreq_gfn() (bsc#1027519). - x86/idle: Fix the C6 eoi_errata[] list to include NEHALEM_EX (bsc#1027519). - x86/iommu: setup MMCFG ahead of IOMMU (bsc#1027519). - x86/mce: Adjustments to intel_init_ppin() (bsc#1027519). - x86/mkelf32: pad load segment to 2Mb boundary (bsc#1027519).

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | xen Debian 12.15 (bookworm) | 4.17.5+72-g01140da4e8-1 | [DEBIAN-CVE-2025-27466](https://patchblox.com/security/data/fix/linux/debian-cve-2025-27466.md) | Sep 11, 2025 |
| Linux | xen Debian 13.5 (trixie) | 4.20.2+7-g1badcf5035-0+deb13u1 | [DEBIAN-CVE-2025-27466](https://patchblox.com/security/data/fix/linux/debian-cve-2025-27466.md) | Sep 11, 2025 |
| Linux | xen Debian 14 | 4.20.2+7-g1badcf5035-1 | [DEBIAN-CVE-2025-27466](https://patchblox.com/security/data/fix/linux/debian-cve-2025-27466.md) | Sep 11, 2025 |
| Linux | xen opensuse-leap 15.6 | 4.18.5_08-150600.3.34.2 | [SUSE-SU-2026:0012-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0012-1.md) | Jan 5, 2026 |
| Linux | xen sles 15.6 | 4.18.5_08-150600.3.34.2 | [SUSE-SU-2026:0012-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0012-1.md) | Jan 5, 2026 |
| Linux | xen sles 15.7 | 4.20.1_04-150700.3.11.1 | [SUSE-SU-2025:03172-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-03172-1.md) | Sep 11, 2025 |

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Data as of 2026-11-08T19:12:23Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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