CVE-2026-90130

vdpa_sim: fix cleanup after worker creation failure

State: Published
Severity: Not scored
Published: Sep 17, 2026
Updated: Oct 19, 2026
Reserved: Sep 11, 2026

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	76acfa7bc54f1e3b9dde396e0a3534493419fd6f to before feafa109f031ed111f7f968e447c13985db498e0Affected 76acfa7bc54f1e3b9dde396e0a3534493419fd6f to before 05ddc94afb69e36df59e88cfa9e5c7bf9d10cfd0Affected 76acfa7bc54f1e3b9dde396e0a3534493419fd6f to before 68b726b3a01fb02a68843781b17d05ef3d759987Affected 76acfa7bc54f1e3b9dde396e0a3534493419fd6f to before ca6f3fa599cb764518df595368b743f856fdb516Affected 76acfa7bc54f1e3b9dde396e0a3534493419fd6f to before bd670e5dfd2b01fd9692f61fa1456434c54026a4Affected
LinuxLinux	6.4Affected before 6.4Not affected 6.6.157 through 6.6.Not affected 6.12.110 through 6.12.Not affected 6.18.52 through 6.18.Not affected 7.2.6 through 7.2.Not affected 7.3 and laterNot affected

Product

Versions

LinuxLinux

76acfa7bc54f1e3b9dde396e0a3534493419fd6f to before feafa109f031ed111f7f968e447c13985db498e0Affected
76acfa7bc54f1e3b9dde396e0a3534493419fd6f to before 05ddc94afb69e36df59e88cfa9e5c7bf9d10cfd0Affected
76acfa7bc54f1e3b9dde396e0a3534493419fd6f to before 68b726b3a01fb02a68843781b17d05ef3d759987Affected
76acfa7bc54f1e3b9dde396e0a3534493419fd6f to before ca6f3fa599cb764518df595368b743f856fdb516Affected
76acfa7bc54f1e3b9dde396e0a3534493419fd6f to before bd670e5dfd2b01fd9692f61fa1456434c54026a4Affected

LinuxLinux

6.4Affected
before 6.4Not affected
6.6.157 through 6.6.*Not affected
6.12.110 through 6.12.*Not affected
6.18.52 through 6.18.*Not affected
7.2.6 through 7.2.*Not affected
7.3 and laterNot affected

References

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