CVE-2026-74488— Linux kernel 安全漏洞
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。
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于在解析A-MSDU TDLS帧时错误使用父帧长度而非子帧长度，可能导致释放后重用和越界读取。
影响版本矩阵 18
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 776f742040ca5eb6242c60f29ac73d5752a5b621< 707664027bb9307f7268eda403af7c4ccd9b8644 |
affected |
776f742040ca5eb6242c60f29ac73d5752a5b621< 3b02275833a0d3e6583627995d614fa99bdf364f |
affected | ||
776f742040ca5eb6242c60f29ac73d5752a5b621< a1f0f7dc7eb15754e6931b433edb7beb754c996a |
affected | ||
776f742040ca5eb6242c60f29ac73d5752a5b621< 25e5a3fe4f15e30f74eca42cbf3bcc3a3fbeda79 |
affected | ||
776f742040ca5eb6242c60f29ac73d5752a5b621< ece2ebb34247d573142617dfc534a9dc11ba59be |
affected | ||
776f742040ca5eb6242c60f29ac73d5752a5b621< c9dcfe6b8b71369e1d732e2ff622c3696a2f032c |
affected | ||
776f742040ca5eb6242c60f29ac73d5752a5b621< 5a21ab03829cb6d2682c127f22e2b9cd63b4393f |
affected | ||
776f742040ca5eb6242c60f29ac73d5752a5b621< 99a948382af8a225e2d5e54a7052158cd6281cc6 |
affected | ||
| … +10 条更多 | |||
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一、 漏洞 CVE-2026-74488 基础信息
漏洞信息
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Vulnerability Title
wifi: mwifiex: use the subframe length when parsing A-MSDU TDLS frames
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
wifi: mwifiex: use the subframe length when parsing A-MSDU TDLS frames
mwifiex_11n_dispatch_amsdu_pkt() splits an A-MSDU with
ieee80211_amsdu_to_8023s() and walks the resulting subframes. For each
subframe it passes the subframe data pointer to
mwifiex_process_tdls_action_frame(), but pairs it with skb->len, the
length of the A-MSDU parent, instead of rx_skb->len:
rx_skb = __skb_dequeue(&list);
rx_hdr = (struct rx_packet_hdr *)rx_skb->data;
if (ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info) &&
ntohs(rx_hdr->eth803_hdr.h_proto) == ETH_P_TDLS) {
mwifiex_process_tdls_action_frame(priv, (u8 *)rx_hdr,
skb->len);
}
The parent is not a valid description of that buffer, and may not be
valid memory at all. ieee80211_amsdu_to_8023s() ends with
if (!reuse_skb)
dev_kfree_skb(skb);
and it only sets reuse_skb when the parent is linear, is not a
head_frag, and is being consumed as the *last* subframe. So when the
parent does not qualify for reuse it has already been freed, and the
read of skb->len is a use-after-free. When it is reused, skb->len is
the length of the last subframe, applied to every earlier subframe,
which over-states the buffer whenever an earlier subframe is shorter.
The callee cannot absorb a wrong length, because it derives its own
ceiling from the value it is given. Each frame type computes
ies_len = len - sizeof(struct ethhdr) - TDLS_*_FIX_LEN;
and the element walk is then bounded entirely against that ceiling,
for (end = pos + ies_len; pos + 1 < end; pos += 2 + pos[1]) {
u8 ie_len = pos[1];
if (pos + 2 + ie_len > end)
break;
so a too-large len moves end past the end of the subframe and the walk
reads and copies beyond it. The A-MSDU layout is chosen by the sender,
which makes the difference between the last subframe and a shorter
earlier one remotely selectable. Reaching this requires TDLS support in
firmware and the TDLS ethertype on the subframe.
The other caller, mwifiex_process_rx_packet(), is correct: it passes a
pointer and a length that describe the same region of the RX buffer.
Pass rx_skb->len, the length of the subframe actually being parsed.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
N/A
来源: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于在解析A-MSDU TDLS帧时错误使用父帧长度而非子帧长度，可能导致释放后重用和越界读取。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
二、漏洞 CVE-2026-74488 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-74488 补丁与修复 (8)
同批安全公告 · Linux · 2026-08-15 · 共 845 条
| CVE-2026-74280 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74279 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72421 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72408 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72407 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74475 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74309 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72493 | 9.9 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72041 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72477 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72209 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72208 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72206 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72299 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74434 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74433 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72473 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72472 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74545 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72322 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
显示前 20 条，共 845 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-74488
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