CVE-2026-90185
UnknownSummary
In the Linux kernel's null_blk module, configfs attributes (submit_queues, poll_queues) are stored without proper synchronization. Concurrent stores via separate file descriptors can cause device state inconsistencies, such as a mismatch between submit_queues and the live queue count or an out-of-bounds access to dev->zones[].
Risk Assessment
This can lead to kernel warnings, errors, and in extreme cases out-of-bounds array access and system instability. The risk mainly occurs when multiple processes configure a null_blk device concurrently.
Recommendation
Update the kernel to a version containing the fix that serializes configfs attribute stores with the lock. Avoid concurrent modification of these attributes from multiple processes until the fix is applied.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: null_blk: serialize configfs attribute stores with the lock The NULLB_DEVICE_ATTR _store takes no lock: apply_fn attributes (submit_queues, poll_queues) get dev->NAME written again after apply_fn returns, outside its lock; APPLY=NULL attributes are entirely lockless. configfs only serializes stores per-open-file, so concurrent stores on separate fds race. For apply_fn attributes, once one store's apply_fn has reconfigured the hardware, a second (losing) store can still overwrite dev->NAME afterwards. This leaves dev->submit_queues out of sync with the live queue count, which is later caught by the WARN_ON_ONCE() in null_map_queues(). For !apply_fn attributes, power_store()'s null_add_dev() validates and builds the device under "lock" but only sets CONFIGURED afterwards. A store slipping in during this window can change a field mid-setup -- for example, zone_nr_conv can be pushed above nr_zones after it has already been clamped, leading to an out-of-bounds dev->zones[] access. Take "lock" in the macro around the apply_fn call, the CONFIGURED test and the field write, and move it out of nullb_apply_submit_queues()/ nullb_apply_poll_queues() so both paths are covered once. This serializes stores with power_store's setup and with each other.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS