CVE-2022-48630: crypto: qcom-rng - fix infinite loop on requests not multiple of WORD_SZ

Severity: medium (CVSS 5.5 v3.1)
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: 2024-03-05 · updated 2026-06-17
Weakness: CWE-835

Description

In the Linux kernel, the following vulnerability has been resolved: crypto: qcom-rng - fix infinite loop on requests not multiple of WORD_SZ The commit referenced in the Fixes tag removed the 'break' from the else branch in qcom_rng_read(), causing an infinite loop whenever 'max' is not a multiple of WORD_SZ. This can be reproduced e.g. by running: kcapi-rng -b 67 >/dev/null There are many ways to fix this without adding back the 'break', but they all seem more awkward than simply adding it back, so do just that. Tested on a machine with Qualcomm Amberwing processor.

Affected products

Linux kernel: from 4.19.236 before 4.19.245; from 5.4.187 before 5.4.196; from 5.10.108 before 5.10.118; from 5.15.31 before 5.15.42; from 5.17 before 5.17.10; 5.18-rc1, 5.18-rc2, 5.18-rc3, 5.18-rc4, 5.18-rc5, 5.18-rc6 (+2) — fixed in 4.19.245, 5.10.118, 5.15.42, 5.17.10, 5.4.196

How to fix

Upgrade to a fixed version: Linux kernel 4.19.245, 5.10.118, 5.15.42, 5.17.10. Check the vendor advisory for mitigations.

References

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