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CVE-2026-58100— Memory safety bugs in kqueue copy-on-fork implementation

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.

在使用 knote 的文件描述符号索引子进程的文件描述符表时，未进行边界检查。由于 knote 在转移之前，子进程的文件描述符表已被复制，父进程中并发线程可能扩展父进程的文件描述符表，并注册具有超出子进程文件描述符表末尾范围的 knote（使用较大的文件描述符号），从而导致越界读取。 未经授权的本地用户可能利用这些竞态条件来提升权限。

AI Predicted 7.8 Difficulty: Hard EPSS 0.14% · P3

Affected Version Matrix 1

VendorProduct Version RangeStatus
FreeBSD FreeBSD 15.1-RELEASE< p4 affected
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I. Basic Information for CVE-2026-58100

Vulnerability Information
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Vulnerability Title
Memory safety bugs in kqueue copy-on-fork implementation
Source: CVE Program / CVE List V5
Vulnerability Description
kqueue_fork_copy_knote() indexed into the child's file descriptor table using a knote's file descriptor number without a bounds check. Because the child's table is copied before knotes are transferred, a concurrent thread in the parent could grow the parent's table and register knotes with file descriptor numbers beyond the end of the child's table, causing an out-of-bounds read. An unprivileged local user may be able to exploit these races 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

Affected Products

Vendor Product Affected Versions CPE Subscribe
FreeBSD FreeBSD 15.1-RELEASE ~ p4 -

II. Public POCs for CVE-2026-58100

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III. Intelligence Information for CVE-2026-58100

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Other References for CVE-2026-58100 (1)

Same Patch Batch · FreeBSD · 2026-10-15 · 13 CVEs total

CVE-2026-58099 Memory safety bugs in kqueue copy-on-fork implementation
CVE-2026-58098 Heap out-of-bounds access in semop(2)
CVE-2026-101302 Remote DoS via receive-side kernel TLS
CVE-2026-101306 Multiple jail filesystem root escapes
CVE-2026-101305 Multiple jail filesystem root escapes
CVE-2026-101304 Multiple jail filesystem root escapes
CVE-2026-101303 IPv6 UDP sendto(2) bypasses jail loopback restriction
CVE-2026-101307 Remotely triggerable buffer overflow in tcp_rack
CVE-2026-101308 TOCTOU race between sound(4) buffer resizing and mmap
CVE-2026-101311 Multiple vulnerabilities in bhyve device models
CVE-2026-101309 Multiple vulnerabilities in bhyve device models
CVE-2026-101310 Multiple vulnerabilities in bhyve device models

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-58100

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