CVE-2026-93206— PCI/proc 配置空间读取访问检查漏洞
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。
在 Linux 内核中，已修复以下漏洞： PCI/proc：在检查配置空间读访问权限时使用 根据 的结果来决定可读取的配置空间范围。该检查验证的是调用 的系统任务（task）的凭据（credentials），而非打开该文件的进程的凭据。 而 sysfs 中的等效函数 自提交 （“pci：从 sysfs 文件打开时检查配置空间的权限，以读取设备相关的配置空间”）起，已开始检查打开文件的进程的凭据。因此，特权进程可以打开配置空间文件，并将文件描述符传递给非特权进程（例如，运行具有分配设备的 KVM 来宾的进程），从而使
可能的 ATT&CK 技术 1 AI
T1528 · Steal Application Access Token影响版本矩阵 18
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 8a3a54aa3e65ed76f8560a387243a7738ae0cb1c |
affected |
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 5c7ab4ca66f0880cffc3735555ea719dd5253726 |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 53407535d49ec034e476121020b5c878f0d92e18 |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< e7730acd6a01c5931a3afb83639810ff2fb9cc92 |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 77272b7fd0e472086fd626a1fcd11da625822cc2 |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< c2d4174f492458ecdcdef309243624999612d526 |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 6351e94076329dab517ea94c115e15c4d8459381 |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< f82f53e75eff382fc8f56b73279b54f7cf5a5c65 |
affected | ||
| … +10 条更多 | |||
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一、 漏洞 CVE-2026-93206 基础信息
漏洞信息
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Vulnerability Title
PCI/proc: Use file_ns_capable() when checking config space read access
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
PCI/proc: Use file_ns_capable() when checking config space read access
proc_bus_pci_read() decides how much of the config space is readable based
on capable(CAP_SYS_ADMIN), which checks the credentials of the task calling
read(), not the credentials of the process that opened the file.
The sysfs equivalent, pci_read_config(), has checked the credentials of the
opening process since commit de139a339395 ("pci: check caps from sysfs file
open to read device dependent config space"), so a privileged process can
open the config space file and pass the file descriptor to an unprivileged
process (for example, a process running a KVM guest with an assigned
device), which can then read the entire config space. The check was
subsequently routed through the LSM framework in commit 47970b1b2aa6 ("pci:
use security_capable() when checking capablities during config space read")
and converted to the dedicated helper in commit ab0fa82b2df9 ("pci-sysfs:
use proper file capability helper function").
Thus, the two interfaces check the same capability against different
credentials. Checking the credentials of the task calling read() makes the
outcome depend on who reads rather than who opened, so the restriction is
bypassed whenever a more privileged process reads through the descriptor.
Checking the credentials recorded in file->f_cred settles the decision at
open() time and ties it to the file, where it cannot change with the
caller.
Use file_ns_capable() to check CAP_SYS_ADMIN against the credentials in
effect when the file was opened, bringing the procfs interface in line with
the sysfs behaviour.
As a result, a file descriptor opened by a privileged process and passed to
an unprivileged one now allows the entire config space to be read through
procfs, matching sysfs.
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
受影响产品
二、漏洞 CVE-2026-93206 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-93206 补丁与修复 (7)
CVE-2026-93206 其他参考 (1)
同批安全公告 · Linux · 2026-09-24 · 共 234 条
| CVE-2026-93207 | 9.8 CRITICAL | SUNRPC svcauth_gss_decode_credbody() 存在安全漏洞 |
| CVE-2026-97413 | 9.8 CRITICAL | Linux RDMA/rtrs-srv整数下溢漏洞 |
| CVE-2026-93228 | 9.1 CRITICAL | svcrdma 拒绝段计数为0的写入/回复块漏洞 |
| CVE-2026-93793 | 8.8 HIGH | iwlwifi 驱动 TX_CMD 响应布局验证漏洞 |
| CVE-2026-93799 | 8.8 HIGH | iwlwifi mvm BA窗口状态通知中sta_id验证漏洞 |
| CVE-2026-93790 | 8.8 HIGH | iwlwifi 驱动 BA 通知中 tid_data 越界访问漏洞 |
| CVE-2026-93806 | 8.8 HIGH | wifi: cfg80211 关联响应长度验证漏洞 |
| CVE-2026-97442 | 8.8 HIGH | ath11k无线驱动rx_h_undecap_nwifi无效数据访问漏洞 |
| CVE-2026-97409 | 8.8 HIGH | Linux NVMe-oF目标未初始化前取消请求漏洞 |
| CVE-2026-97509 | 8.8 HIGH | Thunderbolt 服务期间保持 XDomain 引用漏洞 |
| CVE-2026-93280 | 8.8 HIGH | Greybus 音频拓扑边界检查漏洞 |
| CVE-2026-93284 | 8.8 HIGH | drm/pagemap 迁移错误前未解除 dma 映射 |
| CVE-2026-97451 | 8.4 HIGH | ACPICA mid_op 整数溢出漏洞 |
| CVE-2026-97452 | 8.4 HIGH | ACPICA：防止添加无效引用 |
| CVE-2026-97455 | 8.4 HIGH | ACPICA acpi_ds_terminate_control_method 使用后释放漏洞 |
| CVE-2026-97450 | 8.4 HIGH | ACPICA 双重验证处理器对象类型漏洞 |
| CVE-2026-93827 | 8.4 HIGH | virtio-fs 队列设置失败时双重释放漏洞 |
| CVE-2026-97433 | 8.2 HIGH | NVMe 验证 FDP 配置描述符大小 |
| CVE-2026-93787 | 8.1 HIGH | CIFS cifs_filldir 中目录项名称越界访问漏洞 |
| CVE-2026-93224 | 8.1 HIGH | svcrdma 接受失败时未配对 rn_unregister 漏洞 |
显示前 20 条，共 234 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-93206
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