CVE-2026-80835
UnknownSummary
In the Linux kernel, the crypto_rng interface was removed from the qcom-rng driver because it was redundant and buggy. The driver exposed the same hardware through two separate interfaces, which could lead to concurrent register access and generation of incorrect random values. The hwrng interface remains active and is the one that matters.
Risk Assessment
Potential generation of repeated or non-random values could weaken cryptographic security if the crypto_rng interface was used.
Recommendation
Update the Linux kernel to a version containing this fix to eliminate risks associated with improper random number generation.
Other vulnerabilities in Linux kernel
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: crypto: qcom-rng - Remove crypto_rng interface qcom-rng.c exposes the same hardware through two completely separate interfaces, crypto_rng and hwrng. However, the implementation of this is buggy because it permits generation operations from these interfaces to run concurrently with each other, accessing the same registers. That is, qcom_rng_generate() synchronizes with itself but not with qcom_hwrng_read(). This results in potential repetition of output from the RNG, output of non-random values, etc. Fortunately, there's actually no point in hardware RNG drivers implementing the crypto_rng interface. It's not actually used by anything besides the "rng" algorithm type of AF_ALG, which in turn is not actually used in practice. Other crypto_rng hardware drivers are likewise being phased out, leaving just the hwrng support. Thus, remove it to simplify the code and avoid conflict (and confusion) with the hwrng interface which is the one that actually matters.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS