CVE-2022-49640

Summary

CVE-2022-49640 is a recently resolved vulnerability in the Linux kernel. The issue lies within the sysctl function, where data races existed in proc_douintvec_minmax(). This vulnerability stems from concurrent access to a sysctl variable, which could result in data inconsistencies and unintended behavior. To mitigate this issue, the patch modifies proc_douintvec_minmax() to utilize READ_ONCE() and WRITE_ONCE() internally, ensuring proper data synchronization during concurrent access. Although proc_douintvec_minmax() currently tolerates data races, additional annotations are required on other subsystems to fully address this vulnerability.

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