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CVE-2026-45253— Missing validation in ptrace(PT_SC_REMOTE)

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存在缓冲区错误漏洞，该漏洞源于ptrace(PT_SC_REMOTE)未正确验证syscall(2)和__syscall(2)元系统调用的参数，可能导致具有调试进程能力的用户在内核中触发任意代码执行，从而允许无特权的本地用户提升权限，可能完全控制受影响系统。

AI Predicted 7.8 Difficulty: Easy EPSS 0.20% · P9

Affected Version Matrix 3

VendorProduct Version RangeStatus
FreeBSD FreeBSD 15.0-RELEASE< p9 affected
14.4-RELEASE< p5 affected
14.3-RELEASE< p14 affected
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I. Basic Information for CVE-2026-45253

Vulnerability Information
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Vulnerability Title
Missing validation in ptrace(PT_SC_REMOTE)
Source: CVE Program / CVE List V5
Vulnerability Description
ptrace(PT_SC_REMOTE) failed to properly validate parameters for the syscall(2) and __syscall(2) meta-system calls. As a result, a user with the ability to debug a process may trigger arbitrary code execution in the kernel, even if the target process has no special privileges. The missing validation allows an unprivileged local user to escalate privileges, potentially gaining full control of the affected system.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5
Vulnerability Title
FreeBSD 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FreeBSD是FreeBSD基金会的一套类Unix操作系统。 FreeBSD存在缓冲区错误漏洞，该漏洞源于ptrace(PT_SC_REMOTE)未正确验证syscall(2)和__syscall(2)元系统调用的参数，可能导致具有调试进程能力的用户在内核中触发任意代码执行，从而允许无特权的本地用户提升权限，可能完全控制受影响系统。
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 ~ p9 -

II. Public POCs for CVE-2026-45253

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III. Intelligence Information for CVE-2026-45253

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Vendor Advisories for CVE-2026-45253 (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-2026-45254 Incorrect libcap_net limitation list manipulation
CVE-2026-39461 select(2) file descriptor set overflow causes stack overflow

IV. Related Vulnerabilities

Same product: FreeBSD
Same vendor: FreeBSD
Same weakness: CWE-787

V. Comments for CVE-2026-45253

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