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CVE-2026-93163: hwrng: core - fix rng list on registration error

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-17 · updated 2026-10-30

Description

In the Linux kernel, the following vulnerability has been resolved: hwrng: core - fix rng list on registration error hwrng_register(rng) does the following: 1. Checks if rng has name and read methods set 2. Checks if the name already exists 3. Adds rng to global rng_list 4. May try to set rng to current_rng If step 4 fails, it returns an error. However, it does not remove the rng from rng_list, causing a dangling reference which can result in use-after-free if the caller frees rng, since registration failed. Add a list_del_init() cleanup step.

Affected products

• Linux: from 4.9.320 before 4.10 — fixed in 4.10

How to fix

Upgrade to a fixed version: Linux 4.10. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/30b2cc2966dac87ee95a99c49e28486c2a8129cd
• https://git.kernel.org/stable/c/3a5834db2b1ce25649f330e78efe1ccde78967fd
• https://git.kernel.org/stable/c/bee8d1fcdc8f389b595b0a4cf6fe8440f499458a
• https://git.kernel.org/stable/c/cf293c9c7424de0d04b51367d07f40570ce80231
• https://git.kernel.org/stable/c/de4f1bcb61a73cc896decdbd27d61a34add93b53
• https://git.kernel.org/stable/c/e37c67f768234e14cd6ea3b081568dd915c5b67e

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