CVE-2026-7656— Zephyr 授权问题漏洞
一分钟漏洞结论
影响对象
zephyrproject zephyr
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
Zephyr是Zephyr组织开源的一个可扩展的实时操作系统 (RTOS)。 Zephyr 1.14.0版本至4.4.0版本存在安全漏洞，该漏洞源于IPv6邻居发现处理程序中使用了错误的布尔表达式，可能导致相邻攻击者或远程攻击者绕过Hop Limit == 255等关键检查，接受伪造的路由器通告、邻居请求和邻居通告消息，从而实现中间人攻击、流量重定向和拒绝服务。
影响版本矩阵 1
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| zephyrproject | zephyr | 1.14.0< 4.5.0 |
affected |
获取后续新漏洞提醒
登录后订阅
一、 漏洞 CVE-2026-7656 基础信息
漏洞信息
对漏洞内容有疑问？看看神龙的深度分析是否有帮助！
查看神龙十问 ↗
尽管我们使用了先进的大模型技术，但其输出仍可能包含不准确或过时的信息。神龙努力确保数据的准确性，但请您根据实际情况进行核实和判断。
Vulnerability Title
Broken IPv6 Neighbor Discovery input validation allows spoofed RA/NS/NA acceptance in Zephyr net stack
来源: CVE Program / CVE List V5
Vulnerability Description
The IPv6 Neighbor Discovery handlers in subsys/net/ip/ipv6_nbr.c (handle_ra_input, handle_ns_input, handle_na_input) used an incorrect boolean expression that combined the RFC 4861 validity checks with the ICMPv6 code check using the wrong operator precedence: the form was ((length/hop/source/target checks) && (icmp_hdr->code != 0)). Because every legitimate ND message carries ICMPv6 code 0, an attacker setting code == 0 (the normal value) caused the entire predicate to evaluate false, so the packet was never dropped and all of the other checks were silently skipped. The bypassed checks include the mandatory Hop Limit == 255 verification (which proves an ND packet originated on-link and was not forwarded) and, for Router Advertisements, the requirement that the source be a link-local address, as well as multicast-target sanity checks. As a result, an adjacent on-link attacker — and, because the Hop-Limit-255 guard is bypassed, potentially a remote/off-link attacker whose packets would otherwise be rejected — can have forged Router Advertisement, Neighbor Solicitation, and Neighbor Advertisement messages accepted. A forged RA lets the attacker reconfigure the victim's default router, on-link prefixes (SLAAC), MTU, reachable/retransmit timers, and (with CONFIG_NET_IPV6_RA_RDNSS) DNS servers, while forged NS/NA enable neighbor-cache poisoning, enabling man-in-the-middle, traffic redirection, and denial of service. The flaw is an input-validation/authentication weakness rather than a memory-safety issue: the underlying packet-parsing primitives (net_pkt_get_data, net_pkt_read, net_pkt_skip) are independently bounds-safe and the validated length is the true buffer length, so skipping the length check causes no out-of-bounds access. The defect has existed since the logic was introduced in 2018 and shipped in all releases through v4.4.0; it is fixed by splitting the condition so any failing check drops the packet.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
使用欺骗进行的认证绕过
来源: CVE Program / CVE List V5
Vulnerability Title
Zephyr 授权问题漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Zephyr是Zephyr组织开源的一个可扩展的实时操作系统 (RTOS)。 Zephyr 1.14.0版本至4.4.0版本存在安全漏洞，该漏洞源于IPv6邻居发现处理程序中使用了错误的布尔表达式，可能导致相邻攻击者或远程攻击者绕过Hop Limit == 255等关键检查，接受伪造的路由器通告、邻居请求和邻居通告消息，从而实现中间人攻击、流量重定向和拒绝服务。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
| 厂商 | 产品 | 影响版本 | CPE | 订阅 |
|---|---|---|---|---|
| zephyrproject | zephyr | 1.14.0 ~ 4.5.0 | - |
|
二、漏洞 CVE-2026-7656 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
AI 生成 POC
高级
未找到公开 POC。
登录以生成 AI POC三、漏洞 CVE-2026-7656 的情报信息
请登录查看更多情报信息。
CVE-2026-7656 补丁与修复 (1)
CVE-2026-7656 厂商安全公告 (1)
同批安全公告 · zephyrproject · 2026-06-29 · 共 4 条
| CVE-2026-8023 | 7.5 HIGH | Zephyr 路径遍历漏洞 |
| CVE-2026-10648 | 6.2 MEDIUM | Zephyr 异常处理不当漏洞 |
| CVE-2026-10647 | 5.3 MEDIUM | Zephyr 竞争条件问题漏洞 |
IV. Related Vulnerabilities
V. Comments for CVE-2026-7656
暂无评论