CVE-2025-39986— 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sun4i_can驱动未实现ndo_change_mtu函数，可能导致缓冲区溢出攻击。
可能的 ATT&CK 技术 1 AI
T1190 · Exploit Public-Facing Application影响版本矩阵 18
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 0738eff14d817a02ab082c392c96a1613006f158< 063539db42203b29d5aa2adf0cae3d68c646a6b6 |
affected |
0738eff14d817a02ab082c392c96a1613006f158< 4f382cc887adca8478b9d3e6b81aa6698a95fff4 |
affected | ||
0738eff14d817a02ab082c392c96a1613006f158< 60463a1c138900494cb3adae41142a11cd8feb3c |
affected | ||
0738eff14d817a02ab082c392c96a1613006f158< a61ff7ac93270d20ca426c027d6d01c8ac8e904c |
affected | ||
0738eff14d817a02ab082c392c96a1613006f158< 2e423e1990f3972cbea779883fef52c2f2acb858 |
affected | ||
0738eff14d817a02ab082c392c96a1613006f158< de77841652e57afbc46e9e1dbf51ee364fc008e1 |
affected | ||
0738eff14d817a02ab082c392c96a1613006f158< 7f7b21026a6febdb749f6f6f950427245aa86cce |
affected | ||
0738eff14d817a02ab082c392c96a1613006f158< 61da0bd4102c459823fbe6b8b43b01fb6ace4a22 |
affected | ||
| … +10 条更多 | |||
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一、 漏洞 CVE-2025-39986 基础信息
漏洞信息
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Vulnerability Title
can: sun4i_can: populate ndo_change_mtu() to prevent buffer overflow
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
can: sun4i_can: populate ndo_change_mtu() to prevent buffer overflow
Sending an PF_PACKET allows to bypass the CAN framework logic and to
directly reach the xmit() function of a CAN driver. The only check
which is performed by the PF_PACKET framework is to make sure that
skb->len fits the interface's MTU.
Unfortunately, because the sun4i_can driver does not populate its
net_device_ops->ndo_change_mtu(), it is possible for an attacker to
configure an invalid MTU by doing, for example:
$ ip link set can0 mtu 9999
After doing so, the attacker could open a PF_PACKET socket using the
ETH_P_CANXL protocol:
socket(PF_PACKET, SOCK_RAW, htons(ETH_P_CANXL))
to inject a malicious CAN XL frames. For example:
struct canxl_frame frame = {
.flags = 0xff,
.len = 2048,
};
The CAN drivers' xmit() function are calling can_dev_dropped_skb() to
check that the skb is valid, unfortunately under above conditions, the
malicious packet is able to go through can_dev_dropped_skb() checks:
1. the skb->protocol is set to ETH_P_CANXL which is valid (the
function does not check the actual device capabilities).
2. the length is a valid CAN XL length.
And so, sun4ican_start_xmit() receives a CAN XL frame which it is not
able to correctly handle and will thus misinterpret it as a CAN frame.
This can result in a buffer overflow. The driver will consume cf->len
as-is with no further checks on this line:
dlc = cf->len;
Here, cf->len corresponds to the flags field of the CAN XL frame. In
our previous example, we set canxl_frame->flags to 0xff. Because the
maximum expected length is 8, a buffer overflow of 247 bytes occurs a
couple line below when doing:
for (i = 0; i < dlc; i++)
writel(cf->data[i], priv->base + (dreg + i * 4));
Populate net_device_ops->ndo_change_mtu() to ensure that the
interface's MTU can not be set to anything bigger than CAN_MTU. By
fixing the root cause, this prevents the buffer overflow.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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sun4i_can驱动未实现ndo_change_mtu函数，可能导致缓冲区溢出攻击。
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-2025-39986 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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同批安全公告 · Linux · 2025-10-15 · 共 34 条
| CVE-2025-39975 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-40000 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39969 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39971 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39970 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39972 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39973 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39983 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39982 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39966 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39967 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39976 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39977 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39978 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39979 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39981 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39985 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39987 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39988 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39990 | 7.8 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 34 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2025-39986
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