CVE-2026-45253

⚠️ high

Summary

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.

CVSS Score

8.4

High

EPSS Score

0.0

Exploit Probability

Published Date

2026-05-21

First Seen: 2026-05-22

📊 Relative Risk Intelligence

This CVE is High Risk - more severe than 80.3% of all 328,009 vulnerabilities in our database.

#64,569

Top 25% most severe

Severity Percentile

🎯 CISA SSVC Assessment Updated: May 21, 2026

🔍 Exploitation Status

None

No known exploits

⚙️ Automatable

Requires human interaction

💥 Technical Impact

Total

Complete system compromise possible

🏆 Discovered By

Yuxiang Yang, Yizhou Zhao, Ao Wang, Xuewei Feng, Qi Li, and Ke Xu from Tsinghua University using GLM-5.1 from Z.ai Ryan at Calif.io

SSVC data provided by CISA

Last Modified 2026-05-21

Source NVD 🔗

CVSS Vector 3.1 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CWE IDs (Weakness Types)

CWE-787

📦 Affected Products 3

Vendor	Product	Status	Affected Versions
freebsd	freebsd	Affected	v14.3
freebsd	freebsd	Affected	v14.4
freebsd	freebsd	Affected	v15.0

🔗 References 1

https://security.freebsd.org/advisories/FreeBSD-SA-2...

Vendor Advisory

🔗 Related CVEs 6

CVE ID	Severity	CVSS	EPSS	Summary	Published
CVE-2026-45250	⚠️ high	7.8	0.0	The setcred(2) system call is only available to privileged users. However, before the privilege level of the caller is ...	2026-05-21
CVE-2026-39461	⚠️ high	8.8	0.0	libcasper(3) communicates with helper processes via UNIX domain sockets, and uses the select(2) system call to wait for ...	2026-05-21
CVE-2026-45251	⚠️ high	7.8	0.0	A file descriptor can be closed while a thread is blocked in a poll(2) or select(2) call waiting for that descriptor. B...	2026-05-21
CVE-2026-45252	🔶 medium	5.5	0.1	When a fusefs file system implements extended attributes, the kernel may send a FUSE_LISTXATTR message to the userspace ...	2026-05-21
CVE-2026-45254	🔶 medium	6.5	0.0	In the case of the cap_net service, when a key present in the old limit was omitted from the new limit, the missing key ...	2026-05-21
CVE-2026-45255	⚠️ high	7.5	0.0	When bsdinstall or bsdconfig are prompted to scan for nearby Wi-Fi networks, they build up a list of network names and u...	2026-05-21

These CVEs affect the same products