CVE-2025-37885: KVM: x86: Reset IRTE to host control if *new* route isn't postable
First published: Fri May 09 2025(Updated: )
In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Reset IRTE to host control if *new* route isn't postable Restore an IRTE back to host control (remapped or posted MSI mode) if the *new* GSI route prevents posting the IRQ directly to a vCPU, regardless of the GSI routing type. Updating the IRTE if and only if the new GSI is an MSI results in KVM leaving an IRTE posting to a vCPU. The dangling IRTE can result in interrupts being incorrectly delivered to the guest, and in the worst case scenario can result in use-after-free, e.g. if the VM is torn down, but the underlying host IRQ isn't freed.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel |
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
- https://git.kernel.org/stable/c/e5f2dee9f7fcd2ff4b97869f3c66a0d89c167769
- https://git.kernel.org/stable/c/116c7d35b8f72eac383b9fd371d7c1a8ffc2968b
- https://git.kernel.org/stable/c/023816bd5fa46fab94d1e7917fe131b79ed1fb41
- https://git.kernel.org/stable/c/3481fd96d801715942b6f69fe251133128156f30
- https://git.kernel.org/stable/c/b5de7ac74f69603ad803c524b840bffd36368fc3
- https://git.kernel.org/stable/c/3066ec21d1a33896125747f68638725f456308db
- https://git.kernel.org/stable/c/9bcac97dc42d2f4da8229d18feb0fe2b1ce523a2
Frequently Asked Questions
What is the severity of CVE-2025-37885?
CVE-2025-37885 has been classified as a moderate severity vulnerability due to its impact on kernel memory management.
How do I fix CVE-2025-37885?
To fix CVE-2025-37885, you should update your Linux kernel to the latest stable version that includes the security patch.
Which versions of the Linux kernel are affected by CVE-2025-37885?
CVE-2025-37885 affects multiple versions of the Linux kernel prior to the security patch release.
What type of issue is CVE-2025-37885 related to in the Linux kernel?
CVE-2025-37885 is related to KVM and IRQ routing in the Linux kernel.
What are the potential impacts of CVE-2025-37885?
The potential impacts of CVE-2025-37885 include possible denial of service due to improper handling of interrupt requests.
- collector/mitre-cve
- source/MITRE
- agent/references
- agent/title
- agent/description
- agent/type
- agent/weakness
- agent/first-publish-date
- agent/guess-ai
- agent/software-canonical-lookup
- agent/softwarecombine
- collector/nvd-api
- source/NVD
- agent/author
- agent/last-modified-date
- agent/source
- agent/tags
- agent/event
- vendor/linux
- canonical/linux kernel