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CVE-2026-5398— Kernel use-after-free bug in the TIOCNOTTY handler

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存在资源管理错误漏洞，该漏洞源于TIOCNOTTY实现未能清除指向调用进程会话的控制终端结构指针，可能导致恶意进程利用悬空指针提升自身权限。

AI Predicted 7.8 Difficulty: Easy EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation
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I. Basic Information for CVE-2026-5398

Vulnerability Information
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Vulnerability Title
Kernel use-after-free bug in the TIOCNOTTY handler
Source: CVE Program / CVE List V5
Vulnerability Description
The implementation of TIOCNOTTY failed to clear a back-pointer from the structure representing the controlling terminal to the calling process' session. If the invoking process then exits, the terminal structure may end up containing a pointer to freed memory. A malicious process can abuse the dangling pointer to grant itself root privileges.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
FreeBSD 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FreeBSD是FreeBSD基金会的一套类Unix操作系统。 FreeBSD存在资源管理错误漏洞，该漏洞源于TIOCNOTTY实现未能清除指向调用进程会话的控制终端结构指针，可能导致恶意进程利用悬空指针提升自身权限。
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 ~ p6 -

II. Public POCs for CVE-2026-5398

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III. Intelligence Information for CVE-2026-5398

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Vendor Advisories for CVE-2026-5398 (1)

IV. Related Vulnerabilities

Same product: FreeBSD
Same vendor: FreeBSD
Same weakness: CWE-416

V. Comments for CVE-2026-5398

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