CVE-2024-31143: double unlock in x86 guest IRQ handling
Vulnerability summary
CVE-2024-31143 is a high (CVSS 7.5) Unlock of a Resource that is not Locked vulnerability in xen. EPSS estimates a 0.51% chance of exploitation in the next 30 days, higher than 43.3% of scored vulnerabilities.
Not severe (CVSS 7.5, network access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 8 · Related 6Timeline
- 18-07-2024PublishedVulnerability first disclosed.
- 26-04-2025Last modifiedVulnerability information updated.
Description
An optional feature of PCI MSI called "Multiple Message" allows a device to use multiple consecutive interrupt vectors. Unlike for MSI-X, the setting up of these consecutive vectors needs to happen all in one go. In this handling an error path could be taken in different situations, with or without a particular lock held. This error path wrongly releases the lock even when it is not currently held.
CVSS metrics
5 scores · 5 sources · 1 version- OSV · AlpineEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- NVDNIST7.5HighCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.51%
Chance of exploitation in the next 30 days
Percentile
43%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.51% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Alpine1 product
- xen≥ 4.4.0, < 4.16.6-r1 | ≥ 4.4.0, < 4.17.5-r0 | ≥ 4.4.0, < 4.18.3-r0 | ≥ 4.4.0, < 4.19.0-r0
Debian1 product
- xen< 4.17.5+23-ga4e5191dc0-1 | < 4.19.1-1
Opensuse1 product
- xen&distro=openSUSE Tumbleweed< 4.18.2_06-2.1
Ubuntu1 product
- xenAll versions (No fix recorded)
Xen1 product
- xen≥ 4.4.0 (No fix recorded)
5 vendors · 5 products
