CVE-2025-21090
Publication date 12 August 2025
Last updated 11 November 2025
Ubuntu priority
Description
Missing reference to active allocated resource for some Intel(R) Xeon(R) processors may allow an authenticated user to potentially enable denial of service via local access.
From the Ubuntu Security Team
Joseph Nuzman discovered that some Intel® Xeon® processors did not properly manage references to active allocate resources. A local authenticated user could potentially use this issue to cause a denial of service (system crash).
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| intel-microcode | 25.10 questing |
Fixed 3.20250812.0ubuntu0.25.10.1
|
| 25.04 plucky |
Fixed 3.20250812.0ubuntu0.25.04.1
|
|
| 24.04 LTS noble |
Fixed 3.20250812.0ubuntu0.24.04.1
|
|
| 22.04 LTS jammy |
Fixed 3.20250812.0ubuntu0.22.04.1
|
|
| 20.04 LTS focal |
Fixed 3.20250812.0ubuntu0.20.04.1+esm1
|
|
| 18.04 LTS bionic |
Fixed 3.20250812.0ubuntu0.18.04.1+esm1
|
|
| 16.04 LTS xenial |
Fixed 3.20250812.0ubuntu0.16.04.1+esm1
|
|
| 14.04 LTS trusty | Ignored see notes |
Get expanded security coverage with Ubuntu Pro
Reduce your average CVE exposure time from 98 days to 1 day with expanded CVE patching, ten-years security maintenance and optional support for the full stack of open-source applications. Free for personal use.
Get Ubuntu Pro 30-day free trialNotes
rodrigo-zaiden
trusty cannot use intel-microcode during early boot and is therefore generally not updated.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score |
6.5 · Medium
|
| Attack vector | Local |
| Attack complexity | Low |
| Privileges required | Low |
| User interaction | None |
| Scope | Changed |
| Confidentiality | None |
| Integrity impact | None |
| Availability impact | High |
| Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H |
References
Related Ubuntu Security Notices (USN)
- USN-7866-1
- Intel Microcode vulnerabilities
- 10 November 2025