CVE-2026-93781— SCSI核心scsi_eh_lock_door标签分配阻塞漏洞
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： scsi: core: 在 scsi_eh_lock_door() 中避免在标签分配时阻塞 在 中被调用，此时主机仍处于 （恢复）状态，即尚未切换回 （运行）状态，且 尚未重启队列。该函数通过 分配一个请求，且未传递任何标志，因此当所有标签均已被占用时， 可能会阻塞等待可用的调度标签（sched tag）。 这些标签可能被由 在错误处理期间重新入队的命令持有。此类命令必须等到主机退出 状态并调用 后才能被分发——而这一操作仅在 返回之后才会发生。 这就形成了一个循环依赖：
可能的 ATT&CK 技术 1 AI
T1499 · Endpoint Denial of Service影响版本矩阵 12
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 6e68af666f5336254b5715dca591026b7324499a< 3bc7af4cefac1c583f0607f6183a67012436aad9 |
affected |
6e68af666f5336254b5715dca591026b7324499a< 6b450c277c106c4e31411067f025d1aaa27c2a02 |
affected | ||
6e68af666f5336254b5715dca591026b7324499a< 261c80a6b23e34ba98bcf3f75317e35ecf0a08f0 |
affected | ||
6e68af666f5336254b5715dca591026b7324499a< dc9e1b6b9080dd6374cc9a38e4b53abca63c3b1b |
affected | ||
6e68af666f5336254b5715dca591026b7324499a< 732cb6bb37fd26863d5786522fb1997e7f5865b4 |
affected | ||
2.6.16 |
affected | ||
< 2.6.16 |
unaffected | ||
6.1.189≤ 6.1.* |
unaffected | ||
| … +4 条更多 | |||
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一、 漏洞 CVE-2026-93781 基础信息
漏洞信息
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Vulnerability Title
scsi: core: Do not block on tag allocation in scsi_eh_lock_door()
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
scsi: core: Do not block on tag allocation in scsi_eh_lock_door()
scsi_eh_lock_door() is called from scsi_restart_operations() while the
host is still in the SHOST_RECOVERY state, i.e. before the host is
switched back to SHOST_RUNNING and scsi_run_host_queues() restarts the
queues. It allocates a request via scsi_alloc_request() with no flags,
so blk_mq_get_tag() may block waiting for a free sched tag when all tags
are already in use.
Those tags can be held by commands that were just requeued by
scsi_eh_flush_done_q() during error handling. Such commands cannot be
dispatched until the host leaves SHOST_RECOVERY and
scsi_run_host_queues() is called - which only happens *after*
scsi_eh_lock_door() returns.
This forms a circular dependency:
- scsi_eh_lock_door(), running in the SCSI error handler thread, waits
for a sched tag held by a requeued command;
- the requeued command cannot complete and release its sched tag until
the error handler thread leaves scsi_restart_operations() and restart
the queues.
For devices with a single driver tag (e.g. USB storage) it is a
guaranteed deadlock and I/O that can never be submitted. This problem
has also been reproduced in our environment.
Locking the door is a best-effort operation, and scsi_eh_lock_door()
already returns silently when the request allocation fails. Pass
BLK_MQ_REQ_NOWAIT to scsi_alloc_request() so the allocation fails
instead of blocking when no tag is available. This breaks the circular
dependency and allows the error handler to finish restarting the queues,
after which the pending commands are dispatched normally.
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-2026-93781 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-93781 补丁与修复 (5)
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-2026-97452 | 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-2026-93786 | 8.1 HIGH | ksmbd 保持 VFS 继承 POSIX ACL 掩码漏洞 |
| CVE-2026-93787 | 8.1 HIGH | CIFS cifs_filldir 中目录项名称越界访问漏洞 |
显示前 20 条，共 234 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-93781
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