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CVE-2026-58099— 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.

在将 knote 从父 kqueue 复制到子 kqueue 时，复制代码在将 knote 标记为“in-flux”并释放 kqueue 锁之前，未能正确排除用作内部跟踪列表遍历位置的标记 knote。如果在释放锁后另一个线程释放了某个标记 knote，则后续的 in-flux 减量操作将在已释放的内存上进行。 未经特权的本地用户可能利用这些竞争条件来提升权限。

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-2026-58099

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
When copying knotes from a parent kqueue to a child, the copy code did not correctly exclude marker knotes (used internally to track list traversal position) before marking them as in-flux and releasing the kqueue lock. If another thread freed a marker while the lock was dropped, the subsequent in-flux decrement operated on freed memory. 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-2026-58099

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III. Intelligence Information for CVE-2026-58099

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Other References for CVE-2026-58099 (1)

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

CVE-2026-58098 Heap out-of-bounds access in semop(2)
CVE-2026-58100 Memory safety bugs in kqueue copy-on-fork implementation
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-2026-58099

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