CVE-2026-74488 (GCVE-0-2026-74488)
Vulnerability from cvelistv5
Published
2026-08-15 12:27
Modified
2026-08-19 16:37
Severity ?
VLAI Severity ?
EPSS score ?
Summary
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.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 776f742040ca5eb6242c60f29ac73d5752a5b621 Version: 776f742040ca5eb6242c60f29ac73d5752a5b621 Version: 776f742040ca5eb6242c60f29ac73d5752a5b621 Version: 776f742040ca5eb6242c60f29ac73d5752a5b621 Version: 776f742040ca5eb6242c60f29ac73d5752a5b621 Version: 776f742040ca5eb6242c60f29ac73d5752a5b621 Version: 776f742040ca5eb6242c60f29ac73d5752a5b621 Version: 776f742040ca5eb6242c60f29ac73d5752a5b621 |
||
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/net/wireless/marvell/mwifiex/11n_rxreorder.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
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"status": "affected",
"version": "776f742040ca5eb6242c60f29ac73d5752a5b621",
"versionType": "git"
},
{
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"versionType": "git"
},
{
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"status": "affected",
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"versionType": "git"
},
{
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},
{
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"versionType": "git"
},
{
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}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/net/wireless/marvell/mwifiex/11n_rxreorder.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "4.5"
},
{
"lessThan": "4.5",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.265",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.216",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.183",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.151",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.103",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.44",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.8",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.265",
"versionStartIncluding": "4.5",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.216",
"versionStartIncluding": "4.5",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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{
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},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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},
{
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}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mwifiex: use the subframe length when parsing A-MSDU TDLS frames\n\nmwifiex_11n_dispatch_amsdu_pkt() splits an A-MSDU with\nieee80211_amsdu_to_8023s() and walks the resulting subframes. For each\nsubframe it passes the subframe data pointer to\nmwifiex_process_tdls_action_frame(), but pairs it with skb-\u003elen, the\nlength of the A-MSDU parent, instead of rx_skb-\u003elen:\n\n\trx_skb = __skb_dequeue(\u0026list);\n\trx_hdr = (struct rx_packet_hdr *)rx_skb-\u003edata;\n\tif (ISSUPP_TDLS_ENABLED(priv-\u003eadapter-\u003efw_cap_info) \u0026\u0026\n\t ntohs(rx_hdr-\u003eeth803_hdr.h_proto) == ETH_P_TDLS) {\n\t\tmwifiex_process_tdls_action_frame(priv, (u8 *)rx_hdr,\n\t\t\t\t\t\t skb-\u003elen);\n\t}\n\nThe parent is not a valid description of that buffer, and may not be\nvalid memory at all. ieee80211_amsdu_to_8023s() ends with\n\n\tif (!reuse_skb)\n\t\tdev_kfree_skb(skb);\n\nand it only sets reuse_skb when the parent is linear, is not a\nhead_frag, and is being consumed as the *last* subframe. So when the\nparent does not qualify for reuse it has already been freed, and the\nread of skb-\u003elen is a use-after-free. When it is reused, skb-\u003elen is\nthe length of the last subframe, applied to every earlier subframe,\nwhich over-states the buffer whenever an earlier subframe is shorter.\n\nThe callee cannot absorb a wrong length, because it derives its own\nceiling from the value it is given. Each frame type computes\n\n\ties_len = len - sizeof(struct ethhdr) - TDLS_*_FIX_LEN;\n\nand the element walk is then bounded entirely against that ceiling,\n\n\tfor (end = pos + ies_len; pos + 1 \u003c end; pos += 2 + pos[1]) {\n\t\tu8 ie_len = pos[1];\n\n\t\tif (pos + 2 + ie_len \u003e end)\n\t\t\tbreak;\n\nso a too-large len moves end past the end of the subframe and the walk\nreads and copies beyond it. The A-MSDU layout is chosen by the sender,\nwhich makes the difference between the last subframe and a shorter\nearlier one remotely selectable. Reaching this requires TDLS support in\nfirmware and the TDLS ethertype on the subframe.\n\nThe other caller, mwifiex_process_rx_packet(), is correct: it passes a\npointer and a length that describe the same region of the RX buffer.\n\nPass rx_skb-\u003elen, the length of the subframe actually being parsed."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 8.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:A - The bug is reached when the mwifiex driver processes attacker-supplied A-MSDU TDLS frames received over WiFi from a nearby peer, AP, or injector on the same wireless segment, which is an adjacent RF attack vector rather than remote Internet or local syscall access.\nAC:L - Once TDLS-capable mwifiex firmware receives an A-MSDU, the attacker fully controls subframe sizes and TDLS content to trigger either the skb use-after-free or the overstated-length out-of-bounds parse reliably without depending on uncontrollable timing or memory layout.\nPR:N - Exploitation requires only the ability to deliver crafted 802.11 data frames to the victim radio; it does not require any local account, capability, or root access on the Linux host and is not gated by user-namespace privilege boundaries.\nUI:N - No victim user action beyond normal wireless operation is required; the driver parses malicious TDLS subframes automatically during receive and A-MSDU decomposition before forwarding traffic to the network stack.\nS:U - Impact is confined to kernel memory corruption and driver state within the host kernel security authority; it does not by itself cross a VM, container, or IOMMU boundary to affect a separate security domain.\nC:H - The skb use-after-free reads freed sk_buff metadata and the inflated length drives an out-of-bounds IE walk that reads kernel memory beyond the subframe, including attacker-positioned bytes from subsequent A-MSDU subframes, enabling substantial information disclosure.\nI:H - The same out-of-bounds parse copies attacker-controlled IE data from beyond the subframe into heap-allocated sta_node/tdls_cap structures via memcpy, providing a memory-corruption primitive that can be developed into arbitrary kernel write or code execution.\nA:H - Reading skb-\u003elen after the parent A-MSDU skb may already be freed can immediately fault or corrupt memory, and the out-of-bounds TDLS element parsing can provoke kernel oopses or panics even when full exploitation is not attempted."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-19T16:37:43.361Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/707664027bb9307f7268eda403af7c4ccd9b8644"
},
{
"url": "https://git.kernel.org/stable/c/3b02275833a0d3e6583627995d614fa99bdf364f"
},
{
"url": "https://git.kernel.org/stable/c/a1f0f7dc7eb15754e6931b433edb7beb754c996a"
},
{
"url": "https://git.kernel.org/stable/c/25e5a3fe4f15e30f74eca42cbf3bcc3a3fbeda79"
},
{
"url": "https://git.kernel.org/stable/c/ece2ebb34247d573142617dfc534a9dc11ba59be"
},
{
"url": "https://git.kernel.org/stable/c/c9dcfe6b8b71369e1d732e2ff622c3696a2f032c"
},
{
"url": "https://git.kernel.org/stable/c/5a21ab03829cb6d2682c127f22e2b9cd63b4393f"
},
{
"url": "https://git.kernel.org/stable/c/99a948382af8a225e2d5e54a7052158cd6281cc6"
}
],
"title": "wifi: mwifiex: use the subframe length when parsing A-MSDU TDLS frames",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-74488",
"datePublished": "2026-08-15T12:27:18.867Z",
"dateReserved": "2026-08-15T05:44:03.905Z",
"dateUpdated": "2026-08-19T16:37:43.361Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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