CVE-2026-46132— Linux kernel 安全漏洞
一分钟漏洞结论
影响对象
Linux Linux
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。
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于rtnetlink中rtnl_fill_vfinfo()未初始化ifla_vf_broadcast结构，可能导致堆栈信息泄露。
可能的 ATT&CK 技术 1 AI
T1083 · File and Directory Discovery影响版本矩阵 18
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 75345f888f700c4ab2448287e35d48c760b202e6< 14271b401ec6a4bf0d88054106fc2956084717e1 |
affected |
75345f888f700c4ab2448287e35d48c760b202e6< cccce3190ba4356432b9f22369b56123d3d89f0d |
affected | ||
75345f888f700c4ab2448287e35d48c760b202e6< a44fbb631cba646532f3948636626f81717365a7 |
affected | ||
75345f888f700c4ab2448287e35d48c760b202e6< 0653c0516234c8258975d268a749115fc0f0ff00 |
affected | ||
75345f888f700c4ab2448287e35d48c760b202e6< c5b1b92ab7eff1a6e8c507ddde6fd02fabd0cfa8 |
affected | ||
75345f888f700c4ab2448287e35d48c760b202e6< fbe0e6197225e6a83cf113a67a4b425f8de0bcd5 |
affected | ||
75345f888f700c4ab2448287e35d48c760b202e6< 38bcc21f52246badb3154b6158dcb381d98de011 |
affected | ||
75345f888f700c4ab2448287e35d48c760b202e6< 4b9e327991815e128ad3af75c3a04630a63ce3e0 |
affected | ||
| … +10 条更多 | |||
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一、 漏洞 CVE-2026-46132 基础信息
漏洞信息
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Vulnerability Title
net: rtnetlink: zero ifla_vf_broadcast to avoid stack infoleak in rtnl_fill_vfinfo
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
net: rtnetlink: zero ifla_vf_broadcast to avoid stack infoleak in rtnl_fill_vfinfo
rtnl_fill_vfinfo() declares struct ifla_vf_broadcast on the stack
without initialisation:
struct ifla_vf_broadcast vf_broadcast;
The struct contains a single fixed 32-byte field:
/* include/uapi/linux/if_link.h */
struct ifla_vf_broadcast {
__u8 broadcast[32];
};
The function then copies dev->broadcast into it using dev->addr_len
as the length:
memcpy(vf_broadcast.broadcast, dev->broadcast, dev->addr_len);
On Ethernet devices (the overwhelming majority of SR-IOV NICs)
dev->addr_len is 6, so only the first 6 bytes of broadcast[] are
written. The remaining 26 bytes retain whatever was previously on
the kernel stack. The full struct is then handed to userspace via:
nla_put(skb, IFLA_VF_BROADCAST,
sizeof(vf_broadcast), &vf_broadcast)
leaking up to 26 bytes of uninitialised kernel stack per VF per
RTM_GETLINK request, repeatable.
The other vf_* structs in the same function are explicitly zeroed
for exactly this reason - see the memset() calls for ivi,
vf_vlan_info, node_guid and port_guid a few lines above.
vf_broadcast was simply missed when it was added.
Reachability: any unprivileged local process can open AF_NETLINK /
NETLINK_ROUTE without capabilities and send RTM_GETLINK with an
IFLA_EXT_MASK attribute carrying RTEXT_FILTER_VF. The kernel walks
each VF and emits IFLA_VF_BROADCAST, leaking 26 bytes of stack per
VF per request. Stack residue at this call site can include return
addresses and transient sensitive data; KASAN with stack
instrumentation, or KMSAN, will flag the nla_put() when reproduced.
Zero the on-stack struct before the partial memcpy, matching the
existing pattern used for the other vf_* structs in the same
function.
来源: CVE Program / CVE List V5
CVSS Information
N/A
来源: CVE Program / CVE List V5
Vulnerability Type
N/A
来源: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于rtnetlink中rtnl_fill_vfinfo()未初始化ifla_vf_broadcast结构，可能导致堆栈信息泄露。
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
二、漏洞 CVE-2026-46132 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-46132 补丁与修复 (8)
同批安全公告 · Linux · 2026-05-28 · 共 135 条
| CVE-2026-46135 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-46195 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-46137 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-46115 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-46155 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-46119 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-46185 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-46166 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46125 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46174 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46198 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46238 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46212 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46152 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46113 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46232 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46138 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46215 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46129 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46176 | 7.8 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 135 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-46132
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