crypto: loongson - Remove broken and unused loongson-rng

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Summary

CVECVE-2026-64311
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-25 10:17:12 UTC
Updated2026-07-25 10:17:12 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: crypto: loongson - Remove broken and unused loongson-rng The loongson-rng rng_alg has several vulnerabilities, including not providing forward security, and a use-after-free bug due to the use of wait_for_completion_interruptible(). Meanwhile, the rng_alg framework doesn't really have any purpose in the first place other than to access the software algorithms crypto/drbg.c and crypto/jitterentropy.c. Hardware-specific rng_algs have no in-kernel user, and unlike hwrng there's no feed into the actual Linux RNG. As such, there's really no point to this code. There are of course other rng_alg drivers that are similarly unused, but they're similarly in the process of being phased out, e.g. https://lore.kernel.org/r/[email protected] and https://lore.kernel.org/r/[email protected] Given that, there's no point in fixing forward these vulnerabilities, and it makes much more sense to simply roll back the addition of this driver. If this platform provides TRNG (not PRNG) functionality, it could make sense to add a hwrng driver, but it would be quite different.

Risk And Classification

EPSS: 0.002060000 probability, percentile 0.108520000 (date 2026-07-25)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 766b2d724c8df071031412eea902b566a0049c31 037ec8353711c79353b12d5634e0c9ff363a9efa git Not specified
CNA Linux Linux affected 766b2d724c8df071031412eea902b566a0049c31 43de8b9f01b7dd2f6ca5360c6bf2f203c02288dc git Not specified
CNA Linux Linux affected 766b2d724c8df071031412eea902b566a0049c31 af3d1bb9a09daf928fc3f173689fb7904d6a6d4f git Not specified
CNA Linux Linux affected 6.18 Not specified
CNA Linux Linux unaffected 6.18 semver Not specified
CNA Linux Linux unaffected 6.18.39 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.4 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/037ec8353711c79353b12d5634e0c9ff363a9efa 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/af3d1bb9a09daf928fc3f173689fb7904d6a6d4f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/43de8b9f01b7dd2f6ca5360c6bf2f203c02288dc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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