Linux kernel: UAF in VM mapping leaks kernel data
CVE-2022-23091 Published on February 15, 2024
Memory disclosure by stale virtual memory mapping
A particular case of memory sharing is mishandled in the virtual memory system. This is very similar to SA-21:08.vm, but with a different root cause.
An unprivileged local user process can maintain a mapping of a page after it is freed, allowing that process to read private data belonging to other processes or the kernel.
Vulnerability Analysis
CVE-2022-23091 can be exploited with local system access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality, with no impact on integrity, and no impact on availability.
Weakness Type
What is a Memory Leak Vulnerability?
The software does not sufficiently track and release allocated memory after it has been used, which slowly consumes remaining memory. This is often triggered by improper handling of malformed data or unexpectedly interrupted sessions. In some languages, developers are responsible for tracking memory allocation and releasing the memory. If there are no more pointers or references to the memory, then it can no longer be tracked and identified for release.
CVE-2022-23091 has been classified to as a Memory Leak vulnerability or weakness.
Products Associated with CVE-2022-23091
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Affected Versions
FreeBSD:- Version 13.1-RELEASE and below p1 is affected.
- Version 13.0-RELEASE and below p12 is affected.
- Version 12.3-RELEASE and below p6 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.