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CVE-2026-58093— Kernel use-after-free via tty ioctls

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基金会开源的一款类Unix操作系统。 FreeBSD 15.1-RELEASE p3之前版本、15.0-RELEASE p13之前版本和14.4-RELEASE p9之前版本存在安全漏洞，该漏洞源于TIOCSCTTY ioctl处理器在获取进程树锁时释放tty锁，重新获取后未重新验证终端状态，存在竞争条件，可能将正在被并发销毁的终端链接到调用进程的会话中，导致非特权本地用户可利用此竞态条件提升权限。

AI Predicted 7.8 Difficulty: Hard EPSS 0.10% · P1

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 3

VendorProduct Version RangeStatus
FreeBSD FreeBSD 15.1-RELEASE< p3 affected
15.0-RELEASE< p13 affected
14.4-RELEASE< p9 affected
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I. Basic Information for CVE-2026-58093

Vulnerability Information
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Vulnerability Title
Kernel use-after-free via tty ioctls
Source: CVE Program / CVE List V5
Vulnerability Description
The TIOCSCTTY ioctl handler drops the tty lock in order to acquire the process tree lock. After reacquiring the tty lock, the handler did not revalidate the state of the terminal, and could proceed to link a terminal that was concurrently being destroyed to the calling process' session. An unprivileged local user can exploit this race condition to escalate privileges.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
使用共享资源的并发执行不恰当同步问题(竞争条件)
Source: CVE Program / CVE List V5
Vulnerability Title
FreeBSD 竞争条件问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FreeBSD是FreeBSD基金会开源的一款类Unix操作系统。 FreeBSD 15.1-RELEASE p3之前版本、15.0-RELEASE p13之前版本和14.4-RELEASE p9之前版本存在安全漏洞，该漏洞源于TIOCSCTTY ioctl处理器在获取进程树锁时释放tty锁，重新获取后未重新验证终端状态，存在竞争条件，可能将正在被并发销毁的终端链接到调用进程的会话中，导致非特权本地用户可利用此竞态条件提升权限。
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 15.1-RELEASE ~ p3 -

II. Public POCs for CVE-2026-58093

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III. Intelligence Information for CVE-2026-58093

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Vendor Advisories for CVE-2026-58093 (2)

Same Patch Batch · FreeBSD · 2026-08-26 · 9 CVEs total

CVE-2026-58090 Use-after-free in unix SOCK_STREAM message handling
CVE-2026-58091 Kernel use-after-free via the SNDCTL_DSP_SYNCSTART ioctl
CVE-2026-58092 Unauthorized credential switching
CVE-2026-58089 hwpmc fails to detach PMCs during exec credential transitions
CVE-2026-58097 ppp(8): missing length validation in mp_SetEnddisc()
CVE-2026-58095 ppp(8): incorrect length calculation in mp_Enddisc()
CVE-2026-58096 ppp(8): missing length validation in LcpDecodeConfig()
CVE-2026-58094 TOCTOU race in POSIX shared memory large page configuration

IV. Related Vulnerabilities

Same product: FreeBSD
Same vendor: FreeBSD
Same weakness: CWE-362

V. Comments for CVE-2026-58093

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