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CVE-2026-101308— TOCTOU race between sound(4) buffer resizing and mmap

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.

当音频通道的缓冲区需要调整大小时，sound(4) 驱动会首先检查该缓冲区是否未被内存映射（memory-mapped），随后释放通道锁以分配新缓冲区。在此时间窗口内，其他线程上的 mmap(2) 调用可能完成映射操作；此后，缓冲区调整路径会在未重新检查的情况下释放该现已映射的缓冲区。 具备声音设备访问权限的本地非特权用户可利用此竞态条件，在内核中触发释放后使用（use-after-free）漏洞，从而可能实现权限提升。

AI Predicted 7.8 Difficulty: Moderate EPSS 0.11% · P1

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation
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I. Basic Information for CVE-2026-101308

Vulnerability Information
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Vulnerability Title
TOCTOU race between sound(4) buffer resizing and mmap
Source: CVE Program / CVE List V5
Vulnerability Description
When an audio channel's buffer needs to be resized, the sound(4) driver checks that the buffer is not memory-mapped and then drops the channel lock to allocate a new buffer. An mmap(2) call on another thread can complete during this window, after which the resize path frees the now-mapped buffer without rechecking. An unprivileged local user with access to a sound device can exploit this race to trigger a use-after-free in the kernel, potentially escalating privileges.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
检查时间与使用时间(TOCTOU)的竞争条件
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
FreeBSD FreeBSD 15.1-RELEASE ~ p5 -

II. Public POCs for CVE-2026-101308

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III. Intelligence Information for CVE-2026-101308

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Other References for CVE-2026-101308 (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-2026-58100 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-2026-101311 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-367

V. Comments for CVE-2026-101308

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