EUVD-2026-25885CVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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5DescriptionNVD
In the Linux kernel, the following vulnerability has been resolved:
driver core: enforce device_lock for driver_match_device()
Currently, driver_match_device() is called from three sites. One site (__device_attach_driver) holds device_lock(dev), but the other two (bind_store and __driver_attach) do not. This inconsistency means that bus match() callbacks are not guaranteed to be called with the lock held.
Fix this by introducing driver_match_device_locked(), which guarantees holding the device lock using a scoped guard. Replace the unlocked calls in bind_store() and __driver_attach() with this new helper. Also add a lock assertion to driver_match_device() to enforce this guarantee.
This consistency also fixes a known race condition. The driver_override implementation relies on the device_lock, so the missing lock led to the use-after-free (UAF) reported in Bugzilla for buses using this field.
Stress testing the two newly locked paths for 24 hours with CONFIG_PROVE_LOCKING and CONFIG_LOCKDEP enabled showed no UAF recurrence and no lockdep warnings.
AnalysisAI
Use-after-free in Linux kernel driver core allows local authenticated users to execute arbitrary code, escalate privileges, or crash the system via race condition in device-driver binding operations. The vulnerability stems from inconsistent locking in driver_match_device() function calls, specifically affecting driver_override functionality where device_lock was not held during bind_store() and __driver_attach() operations. …
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RemediationAI
Within 24 hours: Inventory systems running Linux kernels prior to version 7.0 and identify those with multi-user or container workloads. Within 7 days: Prioritize patching to kernel 7.0 or later, or apply backport commit dc23806a7c47 to maintained kernel branches; test in non-production first. …
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