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Fencer Vulns
high 7.3

CVE-2024-45817 json

x86: Deadlock in vlapic_error()

published 2024-09-25 2 y ago modified 2026-06-17 4 mo ago also EUVD-2024-41694

cvss
7.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 45%
public exploits
0
none known

Summary

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.

Patch / fix

  • xen Debian 12 4.17.5+23-ga4e5191dc0-1
  • xen Debian 14, Debian 13 4.19.1-1

debian advisories DEBIAN-CVE-2024-45817

  • xen SLE Module for Server Applications 15 SP6, SLE Module for Basesystem 15 SP6, openSUSE Leap 15.6 4.18.3_06-150600.3.12.1
  • xen SLE Module for Server Applications 15 SP5, SLE Module for Basesystem 15 SP5, SLE Micro 5.5 +2 more 4.17.5_06-150500.3.42.1
  • xen SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 4.12.4_56-3.121.1
  • xen SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 4.12.4_54-3.118.1
  • xen SLE Module for Server Applications 15 SP6, SLE Module for Basesystem 15 SP6, openSUSE Leap 15.6 4.18.3_04-150600.3.9.1
  • xen SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE Micro 5.4 +5 more 4.16.6_04-150400.4.62.1
  • xen SLE Micro 5.2, SLE Micro 5.1 4.14.6_20-150300.3.81.1
  • xen SLE Module for Server Applications 15 SP5, SLE Module for Basesystem 15 SP5, SLE Micro 5.5 +2 more 4.17.5_04-150500.3.39.1

suse advisories SUSE-SU-2024:4163-1SUSE-SU-2024:4073-1SUSE-SU-2024:3980-1SUSE-SU-2024:3586-1SUSE-SU-2024:3432-1SUSE-SU-2024:3424-1

  • xen openSUSE Tumbleweed 4.19.0_04-1.1

opensuse advisories openSUSE-SU-2024:14377-1

  • xen Alpine 3.17 4.16.6-r2
  • xen Alpine 3.18 4.17.5-r1
  • xen Alpine 3.20, Alpine 3.19 4.18.3-r0
  • xen Alpine 3.24, Alpine 3.23, Alpine 3.22 +1 more 4.19.0-r0

alpine advisories ALPINE-CVE-2024-45817

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2024-45817 updated

xen: Deadlock in vlapic_error()

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.54% chance of exploitation in the next 30 days, higher than 45% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
CNA 3.1 7.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Affected products

  • Xen Xen

Classification

Weakness
  • CWE-209 Generation of Error Message Containing Sensitive Information

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.