CVE-2026-93159
UnknownSummary
In the Linux kernel, the crypto: atmel-sha204a driver failed to free the work_data structure when an I2C transfer failed in the nonblocking RNG path. The pointer remained in rng->priv, so subsequent reads could interpret stale state as valid RNG completion data, causing a heap information leak.
Risk Assessment
Kernel heap memory contents may be disclosed (information leak) and invalid random data may be returned, weakening the cryptographic security of the device.
Recommendation
Update the Linux kernel to a version containing the fix that frees work_data on the I2C transfer failure path.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: crypto: atmel-sha204a - fix heap info leak on I2C transfer failure The nonblocking RNG path allocates a work_data structure to track the state of an in-flight asynchronous I2C request. This pointer is stored in rng->priv and later consumed by the read path once the transaction completes. If the underlying I2C transfer fails, the completion callback is invoked with a non-zero status. In this case, the allocated work_data is not usable for producing RNG output and must not remain associated with the hwrng state. Previously, the failure path only logged a warning but left the pointer state uncleared, which can result in subsequent read attempts observing stale state and interpreting it as valid completion data. Fix this by freeing the pending work_data. The I2C transaction reports an error. This ensures that failed requests do not leave residual state behind that could be interpreted as valid RNG data on later reads. Clearing rng->priv is done at the subsequent call to nonblocking read.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS