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CVE-2026-10665— Heap buffer overflow on WireGuard receive path via unbounded incoming packet length

Quick assessment

Affected
zephyrproject zephyr
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.

zephyrproject zephyr是zephyrproject组织开源的一款实时操作系统内核。 Zephyr Project Zephyr 4.4.0版本存在缓冲区错误漏洞，该漏洞源于WireGuard子系统中wg_crypto.c文件的wg_process_data_message()函数对inbound transport-data payload进行线性化处理时，未正确限制目标缓冲区容量和复制长度，导致data_len超过CONFIG_WIREGUARD_BUF_LEN时发生越界写入，造成内存

CVSS 7.4 · High EPSS 0.44% · P37

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
zephyrproject zephyr 4.4.0< 4.5.0 affected
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I. Basic Information for CVE-2026-10665

Vulnerability Information
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Vulnerability Title
Heap buffer overflow on WireGuard receive path via unbounded incoming packet length
Source: CVE Program / CVE List V5
Vulnerability Description
In Zephyr's WireGuard subsystem (subsys/net/lib/wireguard), wg_process_data_message() in wg_crypto.c linearizes an inbound transport-data payload into a fixed pool buffer of CONFIG_WIREGUARD_BUF_LEN bytes before decryption. The call net_buf_linearize(buf->data, data_len, pkt->buffer, ..., data_len) passed the attacker-derived data_len as both the destination capacity and the copy length, defeating the function's internal len = min(len, dst_len) bound. data_len is derived from the received UDP datagram length and is only lower-bounded by wg_ctrl_recv() (no upper bound). When data_len exceeds CONFIG_WIREGUARD_BUF_LEN — e.g. when the buffer length is lowered below the link MTU, on links with MTU above the buffer size, or via reassembled IPv4/IPv6 fragments that exceed it — the underlying memcpy writes past the end of the pool buffer, an out-of-bounds write (CWE-787). The overflow occurs before the Poly1305 authentication check, so it requires only a valid receiver session index rather than a valid authenticator, and is reachable by a malicious or compromised peer (or an on-path attacker driving an established session) over the network, yielding remote memory corruption and at minimum a reliable denial of service. The defect was present in the WireGuard implementation shipped in Zephyr 4.4.0. The fix adds an explicit data_len > CONFIG_WIREGUARD_BUF_LEN rejection and corrects the linearize call to pass net_buf_max_len(buf) as the destination capacity.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5
Vulnerability Title
Zephyr Project Zephyr 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
zephyrproject zephyr是zephyrproject组织开源的一款实时操作系统内核。 Zephyr Project Zephyr 4.4.0版本存在缓冲区错误漏洞，该漏洞源于WireGuard子系统中wg_crypto.c文件的wg_process_data_message()函数对inbound transport-data payload进行线性化处理时，未正确限制目标缓冲区容量和复制长度，导致data_len超过CONFIG_WIREGUARD_BUF_LEN时发生越界写入，造成内存
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
zephyrproject zephyr 4.4.0 ~ 4.5.0 -

II. Public POCs for CVE-2026-10665

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III. Intelligence Information for CVE-2026-10665

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Patches & Fixes for CVE-2026-10665 (1)

Vendor Advisories for CVE-2026-10665 (1)

Same Patch Batch · zephyrproject · 2026-07-12 · 6 CVEs total

CVE-2026-10666 8.1 HIGH Stack buffer overflow in `net_ipaddr_parse()` IPv4 address-with-port parsing in `subsys/ne
CVE-2026-10667 7.8 HIGH SMP use-after-free in Zephyr `CONFIG_USERSPACE` dynamic kernel-object tracking, reachable
CVE-2026-10663 6.1 MEDIUM Use-after-free / double-free of the root USB device in the experimental USB host stack
CVE-2026-10664 5.0 MEDIUM Out-of-bounds write in nRF70 Wi-Fi driver power-save event handler (unbounded TWT flow cou
CVE-2026-10668 2.4 LOW Host-triggerable control-endpoint wedge (DoS) in Nuvoton NuMaker HSUSBD UDC driver

IV. Related Vulnerabilities

Same product: zephyr
Same vendor: zephyrproject
Same weakness: CWE-787

V. Comments for CVE-2026-10665

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