CVE-2025-37799— 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vmxnet3_process_xdp中存在错误的数据包大小处理。
可能的 ATT&CK 技术 1 AI
T1059 · Command and Scripting Interpreter影响版本矩阵 15
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | aba8659caf88017507419feea06069f529329ea6< c4312c4d244aa58e811ff0297e013124d115e793 |
affected |
e127ce7699c1e05279ee5ee61f00893e7bfa9671< 33e131a10459d16f181c8184d3f17f1c318c7002 |
affected | ||
e127ce7699c1e05279ee5ee61f00893e7bfa9671< e3ad76e36a37b0ff4a71b06d5b33530ee8c3a177 |
affected | ||
e127ce7699c1e05279ee5ee61f00893e7bfa9671< 4c2227656d9003f4d77afc76f34dd81b95e4c2c4 |
affected | ||
7c8505ecc2d15473d679b8e06335434b84fffe86 |
affected | ||
91d017d19d5a9ad153e2dc23ed3c0e2e79ef5262 |
affected | ||
6.6.23< 6.6.89 |
affected | ||
6.7.11< 6.8 |
affected | ||
| … +7 条更多 | |||
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一、 漏洞 CVE-2025-37799 基础信息
漏洞信息
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Vulnerability Title
vmxnet3: Fix malformed packet sizing in vmxnet3_process_xdp
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
vmxnet3: Fix malformed packet sizing in vmxnet3_process_xdp
vmxnet3 driver's XDP handling is buggy for packet sizes using ring0 (that
is, packet sizes between 128 - 3k bytes).
We noticed MTU-related connectivity issues with Cilium's service load-
balancing in case of vmxnet3 as NIC underneath. A simple curl to a HTTP
backend service where the XDP LB was doing IPIP encap led to overly large
packet sizes but only for *some* of the packets (e.g. HTTP GET request)
while others (e.g. the prior TCP 3WHS) looked completely fine on the wire.
In fact, the pcap recording on the backend node actually revealed that the
node with the XDP LB was leaking uninitialized kernel data onto the wire
for the affected packets, for example, while the packets should have been
152 bytes their actual size was 1482 bytes, so the remainder after 152 bytes
was padded with whatever other data was in that page at the time (e.g. we
saw user/payload data from prior processed packets).
We only noticed this through an MTU issue, e.g. when the XDP LB node and
the backend node both had the same MTU (e.g. 1500) then the curl request
got dropped on the backend node's NIC given the packet was too large even
though the IPIP-encapped packet normally would never even come close to
the MTU limit. Lowering the MTU on the XDP LB (e.g. 1480) allowed to let
the curl request succeed (which also indicates that the kernel ignored the
padding, and thus the issue wasn't very user-visible).
Commit e127ce7699c1 ("vmxnet3: Fix missing reserved tailroom") was too eager
to also switch xdp_prepare_buff() from rcd->len to rbi->len. It really needs
to stick to rcd->len which is the actual packet length from the descriptor.
The latter we also feed into vmxnet3_process_xdp_small(), by the way, and
it indicates the correct length needed to initialize the xdp->{data,data_end}
parts. For e127ce7699c1 ("vmxnet3: Fix missing reserved tailroom") the
relevant part was adapting xdp_init_buff() to address the warning given the
xdp_data_hard_end() depends on xdp->frame_sz. With that fixed, traffic on
the wire looks good again.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
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vmxnet3_process_xdp中存在错误的数据包大小处理。
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-2025-37799 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2025-37799 补丁与修复 (4)
IV. Related Vulnerabilities
V. Comments for CVE-2025-37799
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