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High severity8.8NVD Advisory· Published May 21, 2026· Updated May 21, 2026

CVE-2026-39461

CVE-2026-39461

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

30
  • FreeBSD/FreeBSD29 versions
    cpe:2.3:o:freebsd:freebsd:14.3:-:*:*:*:*:*:*+ 28 more
    • cpe:2.3:o:freebsd:freebsd:14.3:-:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.3:p1:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.3:p10:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.3:p11:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.3:p12:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.3:p13:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.3:p2:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.3:p3:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.3:p4:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.3:p5:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.3:p6:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.3:p7:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.3:p8:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.3:p9:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.4:-:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.4:p1:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.4:p2:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.4:p3:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.4:p4:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.4:rc1:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:15.0:-:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:15.0:p1:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:15.0:p2:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:15.0:p3:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:15.0:p4:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:15.0:p5:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:15.0:p6:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:15.0:p7:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:15.0:p8:*:*:*:*:*:*
  • FreeBSD/libcasperllm-fuzzy

Patches

Vulnerability mechanics

References

1

News mentions

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