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CVE-2026-39457— Stack overflow via select() file descriptor set overflow

Quick assessment

Affected
FreeBSD FreeBSD
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

FreeBSD是FreeBSD基金会的一套类Unix操作系统。 FreeBSD存在安全漏洞，该漏洞源于使用select等待数据时未验证套接字描述符是否在FD_SETSIZE限制内，可能导致堆栈损坏，进而可能提升本地权限。

AI Predicted 7.8 Difficulty: Moderate EPSS 0.16% · P5

Affected Version Matrix 4

VendorProduct Version RangeStatus
FreeBSD FreeBSD 15.0-RELEASE< p7 affected
14.4-RELEASE< p3 affected
14.3-RELEASE< p12 affected
13.5-RELEASE< p13 affected
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I. Basic Information for CVE-2026-39457

Vulnerability Information
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Vulnerability Title
Stack overflow via select() file descriptor set overflow
Source: CVE Program / CVE List V5
Vulnerability Description
When exchanging data over a socket, libnv uses select(2) to wait for data to arrive. However, it does not verify whether the provided socket descriptor fits in select(2)'s file descriptor set size limit of FD_SETSIZE (1024). An attacker who is able to force a libnv application to allocate large file descriptors, e.g., by opening many descriptors and executing a program which is not careful to close them upon startup, can trigger stack corruption. If the target application is setuid-root, then this could be used to elevate local privileges.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5
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，该漏洞源于使用select等待数据时未验证套接字描述符是否在FD_SETSIZE限制内，可能导致堆栈损坏，进而可能提升本地权限。
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

Vendor Product Affected Versions CPE Subscribe
FreeBSD FreeBSD 15.0-RELEASE ~ p7 -

II. Public POCs for CVE-2026-39457

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III. Intelligence Information for CVE-2026-39457

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Vendor Advisories for CVE-2026-39457 (1)

Same Patch Batch · FreeBSD · 2026-04-30 · 6 CVEs total

CVE-2026-42511 Remote code execution via malicious DHCP options
CVE-2026-7164 pf can overflow the stack parsing crafted SCTP packets
CVE-2026-7270 Local privilege escalation via execve()
CVE-2026-42512 Remotely triggerable out-of-bounds heap write in dhclient
CVE-2026-35547 Heap overflow in libnv

IV. Related Vulnerabilities

Same product: FreeBSD
Same vendor: FreeBSD
Same weakness: CWE-121

V. Comments for CVE-2026-39457

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