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Vulnerabilities CVE-2026-39461

CVE-2026-39461

None
Open
TLP:CLEAR

select(2) file descriptor set overflow causes stack overflow

NVD CVE.org
Critical Infrastructure

AI Analysis

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Description

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.

Details

EPSS Score
0.17%

6.9th percentile

Confidence
90%
Published
May 21, 2026
Last Modified
May 22, 2026
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