CVE-2026-93805— WiFi cfg80211 验证rx/tx MLME回调帧长度
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： wifi: cfg80211: 在访问前验证 rx/tx MLME 回调帧的长度 和 在拒绝短于帧控制字段（frame-control field）的帧之前会调用跟踪点（tracepoints）。此后，它们仅在分发到假设固定字段存在的子类型处理程序之前，要求长度 。 触发此漏洞的帧长度并不短于 2 字节；而是相对于其子类型而言过短。以 mwifiex 为例，这是一个在-tree 中的具体实例： 仅在将帧传递给 之前，要求存在一个 4-地址的 加上 2 字节的固件长度前缀。在
影响版本矩阵 14
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 6829c878ecd24ff0ae41b4668c7e9d0f11b66942< 6eb4bd50be53f5afbabb3a3b5153276e08fa7a4a |
affected |
6829c878ecd24ff0ae41b4668c7e9d0f11b66942< ce2a3be6909462f49c34de96be71f0ad5f0d573f |
affected | ||
6829c878ecd24ff0ae41b4668c7e9d0f11b66942< 6bdf4dcff98df634e04ebf99f52027a48d7f78ff |
affected | ||
6829c878ecd24ff0ae41b4668c7e9d0f11b66942< 0ec738a0d361d7eb37188117166d201f9df622d3 |
affected | ||
6829c878ecd24ff0ae41b4668c7e9d0f11b66942< 8f4127a93cf60d561ad39849a9ac763ba0e14db5 |
affected | ||
6829c878ecd24ff0ae41b4668c7e9d0f11b66942< d5e4586546974179feca305a94e07fac3e9727fe |
affected | ||
2.6.32 |
affected | ||
< 2.6.32 |
unaffected | ||
| … +6 条更多 | |||
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一、 漏洞 CVE-2026-93805 基础信息
漏洞信息
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Vulnerability Title
wifi: cfg80211: validate rx/tx MLME callback frame lengths before access
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
wifi: cfg80211: validate rx/tx MLME callback frame lengths before access
cfg80211_rx_mlme_mgmt() and cfg80211_tx_mlme_mgmt() call tracepoints
before rejecting frames shorter than the frame-control field. After
that, they only require len >= 2 before dispatching into subtype
handlers that assume their fixed fields are present.
The frames that trip this are not shorter than 2 bytes; they are short
relative to their subtype. mwifiex is a concrete in-tree example on the
length side: mwifiex_process_mgmt_packet() only requires a 4-address
ieee80211_hdr plus the 2-byte firmware length prefix before handing the
frame to cfg80211_rx_mlme_mgmt(). After stripping the length prefix and
removing addr4, pkt_len can be exactly 24: a bare 3-address management
header with no reason-code body. The existing WARN_ON(len < 2) does not
fire on such a frame, and cfg80211_process_deauth() then reads
u.deauth.reason_code as a two-byte access starting at offset 24,
immediately past the 24-byte buffer.
Add a frame-control length gate, then validate each subtype's minimum
frame size in an if/else-if chain that mirrors the dispatch logic. Trace
only after the frame is known to be well-formed.
Side effects of this change:
- The WARN_ON(len < 2) is dropped. It only guarded the frame_control
read, never the subtype fixed fields, and it does not fire on the
frames that actually trigger the out-of-bounds read (which are >= 2).
The len >= 2 check is kept as the guard before dereferencing
frame_control, but without the warning: these are exported callbacks
and a malformed frame from a driver should be dropped silently rather
than backtraced.
- cfg80211_tx_mlme_mgmt() previously routed every non-deauth subtype
through disassociation handling; it now silently ignores unrecognised
subtypes.
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-2026-93805 的公开POC
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CVE-2026-93805 补丁与修复 (6)
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-2026-93790 | 8.8 HIGH | iwlwifi 驱动 BA 通知中 tid_data 越界访问漏洞 |
| CVE-2026-93799 | 8.8 HIGH | iwlwifi mvm BA窗口状态通知中sta_id验证漏洞 |
| CVE-2026-97442 | 8.8 HIGH | ath11k无线驱动rx_h_undecap_nwifi无效数据访问漏洞 |
| CVE-2026-93806 | 8.8 HIGH | wifi: cfg80211 关联响应长度验证漏洞 |
| 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-2026-93224 | 8.1 HIGH | svcrdma 接受失败时未配对 rn_unregister 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-2026-93805
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