CVE-2026-58096— ppp(8): missing length validation in LcpDecodeConfig()
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、FreeBSD 15.0-RELEASE p13之前版本和FreeBSD 14.4-RELEASE p9之前版本存在安全漏洞，该漏洞源于LcpDecodeConfig()函数未验证接收的端点鉴别器选项长度是否符合RFC 1717要求，导致越界写入，恶意PPP对端可利用该漏洞导致ppp(8)崩溃或潜在以root权限执行任意代码。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-58096
Vulnerability Information
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Vulnerability Title
ppp(8): missing length validation in LcpDecodeConfig()
Source: CVE Program / CVE List V5
Vulnerability Description
LcpDecodeConfig() did not validate the length of received endpoint discriminator options against the minimum required by RFC 1717. Undersized options would trigger an out-of-bounds write.
A malicious PPP peer can exploit CVE-2026-58095 and CVE-2026-58096 to crash ppp(8) or potentially execute arbitrary code as root.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
长度参数不一致性处理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
FreeBSD 输入验证错误漏洞
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、FreeBSD 15.0-RELEASE p13之前版本和FreeBSD 14.4-RELEASE p9之前版本存在安全漏洞，该漏洞源于LcpDecodeConfig()函数未验证接收的端点鉴别器选项长度是否符合RFC 1717要求，导致越界写入，恶意PPP对端可利用该漏洞导致ppp(8)崩溃或潜在以root权限执行任意代码。
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
II. Public POCs for CVE-2026-58096
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-58096 (1)
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-2026-58093 | Kernel use-after-free via tty ioctls | |
| CVE-2026-58094 | TOCTOU race in POSIX shared memory large page configuration |
IV. Related Vulnerabilities
Same product: FreeBSD
-
CVE-2026-58094
TOCTOU race in POSIX shared memory large page configuration -
CVE-2026-58093
Kernel use-after-free via tty ioctls -
CVE-2026-58097
ppp(8): missing length validation in mp_SetEnddisc() -
CVE-2026-58095
ppp(8): incorrect length calculation in mp_Enddisc() -
CVE-2026-58092
Unauthorized credential switching
Same vendor: FreeBSD
-
CVE-2026-58094
TOCTOU race in POSIX shared memory large page configuration -
CVE-2026-58093
Kernel use-after-free via tty ioctls -
CVE-2026-58097
ppp(8): missing length validation in mp_SetEnddisc() -
CVE-2026-58095
ppp(8): incorrect length calculation in mp_Enddisc() -
CVE-2026-58092
Unauthorized credential switching
Same weakness: CWE-130
V. Comments for CVE-2026-58096
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