CVE-2026-39461— select(2) file descriptor set overflow causes stack overflow
Possible ATT&CK Techniques 1AI
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I. Basic Information for CVE-2026-39461
Vulnerability Information
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Vulnerability Title
select(2) file descriptor set overflow causes stack overflow
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
栈缓冲区溢出
Source: NVD (National Vulnerability Database)
Vulnerability Title
FreeBSD 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FreeBSD是FreeBSD基金会的一套类Unix操作系统。 FreeBSD存在安全漏洞，该漏洞源于未验证套接字描述符是否在FD_SETSIZE限制内，可能导致栈损坏。如果目标应用程序以setuid root权限运行，可能用于提升本地权限。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-39461
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Vendor Advisories for CVE-2026-39461 (1)
Same Patch Batch · FreeBSD · 2026-05-21 · 7 CVEs total
| CVE-2026-45250 | Stack buffer overflow via setcred(2) | |
| CVE-2026-45252 | Heap overflow in FUSE_LISTXATTR | |
| CVE-2026-45255 | Remote code execution via installer Wi-Fi access point scans | |
| CVE-2026-45251 | Kernel use-after-free via file descriptor syscalls | |
| CVE-2026-45253 | Missing validation in ptrace(PT_SC_REMOTE) | |
| CVE-2026-45254 | Incorrect libcap_net limitation list manipulation |
IV. Related Vulnerabilities
Same product: FreeBSD
- CVE-2026-45254
Incorrect libcap_net limitation list manipulation - CVE-2026-45255
Remote code execution via installer Wi-Fi access point scans - CVE-2026-45253
Missing validation in ptrace(PT_SC_REMOTE) - CVE-2026-45252
Heap overflow in FUSE_LISTXATTR - CVE-2026-45251
Kernel use-after-free via file descriptor syscalls
Same vendor: FreeBSD
- CVE-2026-45254
Incorrect libcap_net limitation list manipulation - CVE-2026-45255
Remote code execution via installer Wi-Fi access point scans - CVE-2026-45253
Missing validation in ptrace(PT_SC_REMOTE) - CVE-2026-45252
Heap overflow in FUSE_LISTXATTR - CVE-2026-45251
Kernel use-after-free via file descriptor syscalls
Same weakness: CWE-121
- CVE-2026-9348
Edimax EW-7438RPn webs mp stack-based overflow - CVE-2026-9344
Edimax EW-7438RPn webs formWpsStart stack-based overflow - CVE-2018-25344
10-Strike Network Inventory Explorer 8.54 Buffer Overflow SE - CVE-2026-45250
Stack buffer overflow via setcred(2) - CVE-2026-44056
Stack buffer overflow in desktop.c
V. Comments for CVE-2026-39461
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