# CVE-2024-45817: xen: In x86's APIC (Advanced Programmable Interrupt Controller) architecture, error conditions are reported in a status re...

CVE-2024-45817 is fixed in xen on 1 platform, first by DEBIAN-CVE-2024-45817, released September 25, 2024. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2024-45817
- Priority: High
- CVSS: 7.3 (high)
- EPSS: 0.0054
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 25, 2024

## Description

In x86's APIC (Advanced Programmable Interrupt Controller) architecture, error conditions are reported in a status register.  Furthermore, the OS can opt to receive an interrupt when a new error occurs.  It is possible to configure the error interrupt with an illegal vector, which generates an error when an error interrupt is raised.  This case causes Xen to recurse through vlapic_error().  The recursion itself is bounded; errors accumulate in the the status register and only generate an interrupt when a new status bit becomes set.  However, the lock protecting this state in Xen will try to be taken recursively, and deadlock.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | xen Debian 12.15 (bookworm) | 4.17.5+23-ga4e5191dc0-1 | [DEBIAN-CVE-2024-45817](https://patchblox.com/security/data/fix/linux/debian-cve-2024-45817.md) | Sep 25, 2024 |
| Linux | xen Debian 13.5 (trixie) | 4.19.1-1 | [DEBIAN-CVE-2024-45817](https://patchblox.com/security/data/fix/linux/debian-cve-2024-45817.md) | Sep 25, 2024 |
| Linux | xen Debian 14 | 4.19.1-1 | [DEBIAN-CVE-2024-45817](https://patchblox.com/security/data/fix/linux/debian-cve-2024-45817.md) | Sep 25, 2024 |
| Linux | xen opensuse-leap 15.6 | 4.18.3_06-150600.3.12.1 | [SUSE-SU-2024:4163-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-4163-1.md) | Dec 4, 2024 |
| Linux | xen sles 15.6 | 4.18.3_06-150600.3.12.1 | [SUSE-SU-2024:4163-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-4163-1.md) | Dec 4, 2024 |

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