vdpa_sim: fix cleanup after worker creation failure
vdpasim_create() leaves vdpasim->worker as an ERR_PTR when
kthread_run_worker() fails. The error path then drops the device
reference, which releases the partially initialized simulator.
vdpasim_free() unconditionally passes the worker pointer to
kthread_destroy_worker(), so the ERR_PTR is dereferenced and can trigger
a general protection fault.
Store the worker error, clear the pointer, and only clean up the worker
when it was successfully initialized. Also make the release path tolerate
partially initialized objects by guarding virtqueue and IOTLB cleanup,
since the same release path can be reached from other initialization
failures.
I found this bug myself, though the patch was written with AI assistance.
Analysis
Analysis and contextual insights are available on OpenCVE Cloud.
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Linux | Linux | unaffected |
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| Linux | Linux | affected |
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No data.
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No data available yet.
No vendor fix or workaround currently provided.
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Tracking
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Thu, 17 Sep 2026 16:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | In the Linux kernel, the following vulnerability has been resolved: vdpa_sim: fix cleanup after worker creation failure vdpasim_create() leaves vdpasim->worker as an ERR_PTR when kthread_run_worker() fails. The error path then drops the device reference, which releases the partially initialized simulator. vdpasim_free() unconditionally passes the worker pointer to kthread_destroy_worker(), so the ERR_PTR is dereferenced and can trigger a general protection fault. Store the worker error, clear the pointer, and only clean up the worker when it was successfully initialized. Also make the release path tolerate partially initialized objects by guarding virtqueue and IOTLB cleanup, since the same release path can be reached from other initialization failures. I found this bug myself, though the patch was written with AI assistance. | |
| Title | vdpa_sim: fix cleanup after worker creation failure | |
| First Time appeared |
Linux
Linux linux Kernel |
|
| CPEs | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Linux
Linux linux Kernel |
|
| References |
|
|
MITRE
Status: PUBLISHED
Assigner: Linux
Published:
Updated: 2026-09-17T16:06:31.216Z
Reserved: 2026-09-11T19:38:34.788Z
Link: CVE-2026-90130
Vulnrichment
No data.
NVD
Status : Received
Published: 2026-09-17T17:17:05.493
Modified: 2026-09-17T17:17:05.493
Link: CVE-2026-90130
Redhat
No data.
OpenCVE Enrichment
No data.
No weakness.