CVE-2026-93282— ksmbd 修复最大允许访问检查漏洞
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： ksmbd：修正最大允许访问权限的检查逻辑 DACL（离散访问控制列表）权限检查会查找与当前用户匹配的 ACE（访问控制条目），若无匹配则回退到 Everyone（所有人）ACE。然而，该逻辑未考虑 Authenticated Users（已认证用户）ACE。实际上，任何已认证会话的成员均属于该知名组（S-1-5-11）。 因此，当通过 S-1-5-11（Authenticated Users 组）授予访问权限的文件被打开时，可能错误地返回 STATUS_ACCESS_DE
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一、 漏洞 CVE-2026-93282 基础信息
漏洞信息
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Vulnerability Title
ksmbd: fix maximum allowed access checks
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
ksmbd: fix maximum allowed access checks
The DACL permission check looks for an ACE matching the current user and
falls back to the Everyone ACE. It does not consider an Authenticated
Users ACE, even though an authenticated session is a member of that
well-known group.
As a result, opening a file whose access is granted through S-1-5-11 can
incorrectly fail with STATUS_ACCESS_DENIED. Treat an Authenticated Users
ACE as a fallback entry alongside Everyone.
The maximal access calculation also combines access masks from every ACE,
regardless of whether its SID applies to the current user. This can grant
rights belonging to an unrelated principal. Process only ACEs applying to
the user, Everyone, or Authenticated Users, and accumulate allowed and
denied masks in ACL order. Preserve explicitly requested access bits so
they are validated against the resulting maximal mask.
When ACCESS_SYSTEM_SECURITY is denied, report STATUS_PRIVILEGE_NOT_HELD
instead of the generic STATUS_ACCESS_DENIED. Access to the system ACL
requires a security privilege that ksmbd does not grant.
For regular files, include FILE_EXECUTE in maximal access when the client
requested GENERIC_EXECUTE and the DACL grants the complete file-read set.
Keep a direct FILE_EXECUTE request subject to the explicit DACL bit. This
matches the POSIX file ACL mapping without broadening specific execute
requests.
Do not replace rights from an applicable NT ACE with a POSIX ACL entry.
The POSIX ACL is only a fallback when no user, Everyone, or Authenticated
Users ACE applies; otherwise it can incorrectly broaden the stored DACL.
This fixes smb2.maximum_allowed.maximum_allowed.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
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-2026-93282 的公开POC
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CVE-2026-93282 补丁与修复 (2)
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-2026-97509 | 8.8 HIGH | Thunderbolt 服务期间保持 XDomain 引用漏洞 |
| CVE-2026-97409 | 8.8 HIGH | Linux NVMe-oF目标未初始化前取消请求漏洞 |
| CVE-2026-93280 | 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-2026-97455 | 8.4 HIGH | ACPICA acpi_ds_terminate_control_method 使用后释放漏洞 |
| CVE-2026-97452 | 8.4 HIGH | ACPICA：防止添加无效引用 |
| 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-2026-93786 | 8.1 HIGH | ksmbd 保持 VFS 继承 POSIX ACL 掩码漏洞 |
| CVE-2026-93221 | 8.1 HIGH | NFS服务端标志位转换为无符号长整型 |
显示前 20 条，共 234 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-93282
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