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Vulnerability Details CVE-2023-0240

There is a logic error in io_uring's implementation which can be used to trigger a use-after-free vulnerability leading to privilege escalation. In the io_prep_async_work function the assumption that the last io_grab_identity call cannot return false is not true, and in this case the function will use the init_cred or the previous linked requests identity to do operations instead of using the current identity. This can lead to reference counting issues causing use-after-free. We recommend upgrading past version 5.10.161.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 3.2%
CVSS Severity
CVSS v3 Score 7.8
Products affected by CVE-2023-0240


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