Use of Uninitialized Variable in Linux kernel - CVE-2026-93238
Published: September 25, 2026
Vulnerability identifier: #VU152162
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-93238
CWE-ID: CWE-457
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause unintended guest hardware queue resets.
The vulnerability exists due to use of an uninitialized bitmap in vfio_ap_mdev_hot_plug_cfg() when processing a hot-plug configuration change that adds only control domains. A local user can modify the hot-plug configuration to add only control domains to cause unintended guest hardware queue resets.
Affected software
Linux kernel
How to mitigate CVE-2026-93238
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
External References
- https://git.kernel.org/stable/c/09548edc6114f1eb1035b30795e893204ef45b85
- https://git.kernel.org/stable/c/4ba8a08f5f26ed59f356a6318bca3aa7cc0af3e2
- https://git.kernel.org/stable/c/6d554f2571e6b4db242593ba561efd6a6d1f99a9
- https://git.kernel.org/stable/c/bf09b9d7cd7890bc3a3b7eb63d5ece15f88bfde7
- https://git.kernel.org/stable/c/f73db632524320d2b93bc8534be8ea875053502d