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CVE-2026-101302— Remote DoS via receive-side kernel TLS

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.

TLS 1.3 将实际的记录类型嵌入在解密后载荷的最后一个非零字节中，后面可选择性地跟随零填充。负责查找内部记录类型的代码中存在一个“差一”（off-by-one）错误，该错误可通过无效的帧触发，导致下溢（underflow），进而引发无条件空指针解引用，最终造成内核恐慌（kernel panic）。 远程 TLS 1.3 对等端可以通过发送特制的记录来触发内核恐慌，从而导致服务拒绝（Denial of Service, DoS）。

AI Predicted 7.5 Difficulty: Easy EPSS 0.19% · P8

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 4

VendorProduct Version RangeStatus
FreeBSD FreeBSD 15.1-RELEASE< p4 affected
15.0-RELEASE< p14 affected
14.5-RELEASE< p1 affected
14.4-RELEASE< p10 affected
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I. Basic Information for CVE-2026-101302

Vulnerability Information
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Vulnerability Title
Remote DoS via receive-side kernel TLS
Source: CVE Program / CVE List V5
Vulnerability Description
TLS 1.3 embeds the actual record type as the last non-zero byte of the decrypted payload, optionally followed by zero padding. The code which searches for the inner record type had an off-by-one bug which could be triggered by an invalid frame, leading to an underflow followed by an unconditional NULL pointer dereference, causing a kernel panic. A remote TLS 1.3 peer can send a specially crafted record to trigger a kernel panic, resulting in a Denial of Service (DoS).
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
Off-by-one错误
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-2026-101302

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III. Intelligence Information for CVE-2026-101302

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Other References for CVE-2026-101302 (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-2026-101306 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-193

V. Comments for CVE-2026-101302

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