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CVE-2026-49416— Integer overflow in vt(4) CONS_HISTORY ioctl

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基金会开源的一套类Unix操作系统。 FreeBSD存在数字错误漏洞，该漏洞源于CONS_HISTORY ioctl处理程序未充分验证请求的历史记录大小，导致整数溢出，从而分配比预期更小的堆缓冲区，后续初始化写入超出分配边界。

AI Predicted 7.8 Difficulty: Moderate EPSS 0.15% · P4

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 3

VendorProduct Version RangeStatus
FreeBSD FreeBSD 15.0-RELEASE< p10 affected
14.4-RELEASE< p6 affected
14.3-RELEASE< p15 affected
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I. Basic Information for CVE-2026-49416

Vulnerability Information
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Vulnerability Title
Integer overflow in vt(4) CONS_HISTORY ioctl
Source: CVE Program / CVE List V5
Vulnerability Description
The CONS_HISTORY ioctl handler did not adequately validate the requested history size. A large value caused an integer overflow in the buffer size calculation, resulting in a heap allocation smaller than expected. Subsequent initialization of the buffer wrote beyond the end of the allocation. An unprivileged local user with access to a vt(4) device can trigger an out-of-bounds write in the kernel, potentially escalating privileges.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
Source: CVE Program / CVE List V5
Vulnerability Title
FreeBSD 数字错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FreeBSD是FreeBSD基金会开源的一套类Unix操作系统。 FreeBSD存在数字错误漏洞，该漏洞源于CONS_HISTORY ioctl处理程序未充分验证请求的历史记录大小，导致整数溢出，从而分配比预期更小的堆缓冲区，后续初始化写入超出分配边界。
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 ~ p10 -

II. Public POCs for CVE-2026-49416

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III. Intelligence Information for CVE-2026-49416

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Vendor Advisories for CVE-2026-49416 (1)

Same Patch Batch · FreeBSD · 2026-06-27 · 7 CVEs total

CVE-2026-49414 ASLR bypass for setuid executables via procctl(2)
CVE-2026-49413 Flaw in Linuxulator execution of setugid binaries
CVE-2026-49412 Use-after-free bug in the IPV6_MSFILTER socket option handler
CVE-2026-45259 sigqueue(2) missing capability mode restriction
CVE-2026-45258 Multiple vulnerabilities in the sound(4) mmap path
CVE-2026-49417 Multiple vulnerabilities in the sound(4) mmap path

IV. Related Vulnerabilities

Same product: FreeBSD
Same vendor: FreeBSD
Same weakness: CWE-190

V. Comments for CVE-2026-49416

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