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CVE-2026-58090— Use-after-free in unix SOCK_STREAM message handling

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.

Unix 套接字实现中的 SOCK_STREAM 接收路径在处理控制消息之前，未能将其从套接字缓冲区中完全分离。在某些错误处理路径中，这些消息会被释放，导致已释放的数据 mbuf（内存缓冲块）残留在接收套接字缓冲区中。 特权用户可利用此处的释放后使用（use-after-free）漏洞，提升自身权限。

AI Predicted 7.8 Difficulty: Moderate

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation
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I. Basic Information for CVE-2026-58090

Vulnerability Information
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Vulnerability Title
Use-after-free in unix SOCK_STREAM message handling
Source: CVE Program / CVE List V5
Vulnerability Description
The SOCK_STREAM receive path in the unix socket implementation failed to fully detach control messages from the socket buffer before processing them. Some error paths would free those messages, leaving freed data mbufs in the receive socket buffer. An unprivileged local user can exploit this use-after-free to escalate 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

Affected Products

Vendor Product Affected Versions CPE Subscribe
FreeBSD FreeBSD 15.1-RELEASE ~ p3 -

II. Public POCs for CVE-2026-58090

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III. Intelligence Information for CVE-2026-58090

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Vendor Advisories for CVE-2026-58090 (1)

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

CVE-2026-58089 hwpmc fails to detach PMCs during exec credential transitions
CVE-2026-58091 Kernel use-after-free via the SNDCTL_DSP_SYNCSTART ioctl
CVE-2026-58092 Unauthorized credential switching
CVE-2026-58095 ppp(8): incorrect length calculation in mp_Enddisc()
CVE-2026-58096 ppp(8): missing length validation in LcpDecodeConfig()
CVE-2026-58097 ppp(8): missing length validation in mp_SetEnddisc()
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
Same vendor: FreeBSD
Same weakness: CWE-416

V. Comments for CVE-2026-58090

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