CVE-2026-90130
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.
How to fix
- Linux Linuxfeafa109f031ed111f7f968e447c13985db498e0, 05ddc94afb69e36df59e88cfa9e5c7bf9d10cfd0, 68b726b3a01fb02a68843781b17d05ef3d759987, ca6f3fa599cb764518df595368b743f856fdb516, bd670e5dfd2b01fd9692f61fa1456434c54026a4 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 76acfa7bc54f1e3b9dde396e0a3534493419fd6f ≤ v < feafa109f031ed111f7f968e447c13985db498e0, 76acfa7bc54f1e3b9dde396e0a3534493419fd6f ≤ v < 05ddc94afb69e36df59e88cfa9e5c7bf9d10cfd0, 76acfa7bc54f1e3b9dde396e0a3534493419fd6f ≤ v < 68b726b3a01fb02a68843781b17d05ef3d759987, 76acfa7bc54f1e3b9dde396e0a3534493419fd6f ≤ v < ca6f3fa599cb764518df595368b743f856fdb516, 76acfa7bc54f1e3b9dde396e0a3534493419fd6f ≤ v < bd670e5dfd2b01fd9692f61fa1456434c54026a4, 6.4 | feafa109f031ed111f7f968e447c13985db498e0, 05ddc94afb69e36df59e88cfa9e5c7bf9d10cfd0, 68b726b3a01fb02a68843781b17d05ef3d759987, ca6f3fa599cb764518df595368b743f856fdb516, bd670e5dfd2b01fd9692f61fa1456434c54026a4 |
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