CVE-2022-49852: riscv: process: fix kernel info leakage

Severity: high (CVSS 7.1 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: 2025-05-01 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: riscv: process: fix kernel info leakage thread_struct's s[12] may contain random kernel memory content, which may be finally leaked to userspace. This is a security hole. Fix it by clearing the s[12] array in thread_struct when fork. As for kthread case, it's better to clear the s[12] array as well.

Affected products

Linux kernel: from 4.15 before 4.19.267; from 4.20 before 5.4.225; from 5.5 before 5.10.155; from 5.11 before 5.15.79; from 5.16 before 6.0.9; 6.1-rc1, 6.1-rc2, 6.1-rc3, 6.1-rc4 — fixed in 4.19.267, 5.10.155, 5.15.79, 5.4.225, 6.0.9

How to fix

Upgrade to a fixed version: Linux kernel 4.19.267, 5.10.155, 5.15.79, 5.4.225. Check the vendor advisory for mitigations.

References

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