CVE-2026-93805— wifi: cfg80211: validate rx/tx MLME callback frame lengths before access
Quick assessment
Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
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
Possible ATT&CK Techniques 2 AI
T1068 · Exploitation for Privilege Escalation T1207 · Rogue Domain ControllerAffected Version Matrix 14
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| 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 more rows | |||
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I. Basic Information for CVE-2026-93805
Vulnerability Information
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Vulnerability Title
wifi: cfg80211: validate rx/tx MLME callback frame lengths before access
Source: 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-93805
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-93805 (6)
Same Patch Batch · Linux · 2026-09-24 · 234 CVEs total
| CVE-2026-93207 | 9.8 CRITICAL | SUNRPC: Zero rpc_gss_wire_cred at svcauth_gss_decode_credbody() entry |
| CVE-2026-97413 | 9.8 CRITICAL | RDMA/rtrs-srv: Fix integer underflow in process_read and process_write |
| CVE-2026-93228 | 9.1 CRITICAL | svcrdma: Reject Write/Reply chunks with segcount 0 |
| CVE-2026-93793 | 8.8 HIGH | wifi: iwlwifi: mvm: validate TX_CMD response layout |
| CVE-2026-93790 | 8.8 HIGH | wifi: iwlwifi: mvm: fix out-of-bounds tid_data access in BA notif |
| CVE-2026-93799 | 8.8 HIGH | wifi: iwlwifi: mvm: validate sta_id in BA window status notif |
| CVE-2026-97442 | 8.8 HIGH | wifi: ath11k: fix invalid data access in ath11k_dp_rx_h_undecap_nwifi |
| CVE-2026-93806 | 8.8 HIGH | wifi: cfg80211: validate assoc response length before status and IE access |
| CVE-2026-97509 | 8.8 HIGH | thunderbolt: Keep XDomain reference during the lifetime of a service |
| CVE-2026-97409 | 8.8 HIGH | nvme-fc: Do not cancel requests in io target before it is initialized |
| CVE-2026-93280 | 8.8 HIGH | greybus: audio: bound the topology section sizes against the fetched size |
| CVE-2026-93284 | 8.8 HIGH | drm/pagemap: dma-unmap pages before handling migration errors |
| CVE-2026-97451 | 8.4 HIGH | ACPICA: Fix integer overflow in acpi_ex_opcode_3A_1T_1R() (mid_op) |
| CVE-2026-97452 | 8.4 HIGH | ACPICA: Prevent adding invalid references |
| CVE-2026-97455 | 8.4 HIGH | ACPICA: Fix use-after-free in acpi_ds_terminate_control_method() |
| CVE-2026-97450 | 8.4 HIGH | ACPICA: validate handler object type in two places |
| CVE-2026-93827 | 8.4 HIGH | virtio-fs: avoid double-free on failed queue setup |
| CVE-2026-97433 | 8.2 HIGH | nvme: validate FDP configuration descriptor sizes |
| CVE-2026-93224 | 8.1 HIGH | svcrdma: Fix unmatched rn_unregister on failed accept |
| CVE-2026-93787 | 8.1 HIGH | smb: client: bound dirent name against end of SMB response in cifs_filldir |
Showing top 20 of 234 CVEs. View all on vendor page → →
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V. Comments for CVE-2026-93805
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