Use-After-Free in Linux Kernel io_uring Enables Local Priv Escalation
CVE-2023-2236 Published on May 1, 2023
Use-after-free in Linux kernel's Performance Events subsystem
A use-after-free vulnerability in the Linux Kernel io_uring subsystem can be exploited to achieve local privilege escalation.
Both io_install_fixed_file and its callers call fput in a file in case of an error, causing a reference underflow which leads to a use-after-free vulnerability.
We recommend upgrading past commit 9d94c04c0db024922e886c9fd429659f22f48ea4.
Vulnerability Analysis
CVE-2023-2236 is exploitable with local system access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. Public availability of a proof of concept (POC) exploit exists for CVE-2023-2236. The potential impact of an exploit of this vulnerability is considered to be very high.
Weakness Type
What is a Dangling pointer Vulnerability?
Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code.
CVE-2023-2236 has been classified to as a Dangling pointer vulnerability or weakness.
Products Associated with CVE-2023-2236
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Affected Versions
Linux Kernel:- Version 5.19 and below 6.1 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.