CVE-2026-31411— 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sigd_send函数中未验证vcc指针，可能导致内核崩溃。
可能的 ATT&CK 技术 1 AI
T1068 · Exploitation for Privilege Escalation影响版本矩阵 18
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< c96549d07dfdd51aadf0722cfb40711574424840 |
affected |
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 1c8bda3df028d5e54134077dcd09f46ca8cfceb5 |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 3e1a8b00095246a9a2b46b57f6d471c6d3c00ed2 |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< e3f80666c2739296c3b69a127300455c43aa1067 |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 21c303fec138c002f90ed33bce60e807d53072bb |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 69d3f9ee5489e6e8b66defcfa226e91d82393297 |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 440c9a5fc477a8ee259d8bf669531250b8398651 |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< ae88a5d2f29b69819dc7b04086734439d074a643 |
affected | ||
| … +10 条更多 | |||
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一、 漏洞 CVE-2026-31411 基础信息
漏洞信息
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Vulnerability Title
net: atm: fix crash due to unvalidated vcc pointer in sigd_send()
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
net: atm: fix crash due to unvalidated vcc pointer in sigd_send()
Reproducer available at [1].
The ATM send path (sendmsg -> vcc_sendmsg -> sigd_send) reads the vcc
pointer from msg->vcc and uses it directly without any validation. This
pointer comes from userspace via sendmsg() and can be arbitrarily forged:
int fd = socket(AF_ATMSVC, SOCK_DGRAM, 0);
ioctl(fd, ATMSIGD_CTRL); // become ATM signaling daemon
struct msghdr msg = { .msg_iov = &iov, ... };
*(unsigned long *)(buf + 4) = 0xdeadbeef; // fake vcc pointer
sendmsg(fd, &msg, 0); // kernel dereferences 0xdeadbeef
In normal operation, the kernel sends the vcc pointer to the signaling
daemon via sigd_enq() when processing operations like connect(), bind(),
or listen(). The daemon is expected to return the same pointer when
responding. However, a malicious daemon can send arbitrary pointer values.
Fix this by introducing find_get_vcc() which validates the pointer by
searching through vcc_hash (similar to how sigd_close() iterates over
all VCCs), and acquires a reference via sock_hold() if found.
Since struct atm_vcc embeds struct sock as its first member, they share
the same lifetime. Therefore using sock_hold/sock_put is sufficient to
keep the vcc alive while it is being used.
Note that there may be a race with sigd_close() which could mark the vcc
with various flags (e.g., ATM_VF_RELEASED) after find_get_vcc() returns.
However, sock_hold() guarantees the memory remains valid, so this race
only affects the logical state, not memory safety.
[1]: https://gist.github.com/mrpre/1ba5949c45529c511152e2f4c755b0f3
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sigd_send函数中未验证vcc指针，可能导致内核崩溃。
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-2026-31411 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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IV. Related Vulnerabilities
V. Comments for CVE-2026-31411
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