CVE-2026-39461
HighCVSS 8.8Exploitation Probability (EPSS)
Low risk7th percentile - higher than 7% of all known CVEs
Summary
The libcasper(3) library does not verify that the socket descriptor fits within the FD_SETSIZE (1024) limit for select(2). An attacker can cause large file descriptors to be allocated, leading to stack corruption.
Risk Assessment
If the application runs with setuid root privileges, an attacker could escalate local privileges.
Recommendation
Update libcasper(3) to a version that includes a fix for checking the descriptor size before using select(2).
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Original NVD description (English source)
libcasper(3) communicates with helper processes via UNIX domain sockets, and uses the select(2) system call to wait for data to become available. However, it does not verify that its socket descriptor fits within select(2)'s descriptor set size limit of FD_SETSIZE (1024). An attacker able to cause an application using libcasper(3) to allocate large file descriptors, e.g., by opening many descriptors and executing a program which is not careful to close them upon startup, may trigger stack corruption. If the target application runs with setuid root privileges, this could be used to escalate local privileges.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS