wifi: mwifiex: use the subframe length when parsing A-MSDU TDLS frames
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
CVE-2026-74488
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-74488
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "776f742040ca5eb6242c60f29ac73d5752a5b621",
"lessThan": "707664027bb9307f7268eda403af7c4ccd9b8644",
"versionType": "git"
},
{
"status": "affected",
"version": "776f742040ca5eb6242c60f29ac73d5752a5b621",
"lessThan": "3b02275833a0d3e6583627995d614fa99bdf364f",
"versionType": "git"
},
{
"status": "affected",
"version": "776f742040ca5eb6242c60f29ac73d5752a5b621",
"lessThan": "a1f0f7dc7eb15754e6931b433edb7beb754c996a",
"versionType": "git"
},
{
"status": "affected",
"version": "776f742040ca5eb6242c60f29ac73d5752a5b621",
"lessThan": "25e5a3fe4f15e30f74eca42cbf3bcc3a3fbeda79",
"versionType": "git"
},
{
"status": "affected",
"version": "776f742040ca5eb6242c60f29ac73d5752a5b621",
"lessThan": "ece2ebb34247d573142617dfc534a9dc11ba59be",
"versionType": "git"
},
{
"status": "affected",
"version": "776f742040ca5eb6242c60f29ac73d5752a5b621",
"lessThan": "c9dcfe6b8b71369e1d732e2ff622c3696a2f032c",
"versionType": "git"
},
{
"status": "affected",
"version": "776f742040ca5eb6242c60f29ac73d5752a5b621",
"lessThan": "5a21ab03829cb6d2682c127f22e2b9cd63b4393f",
"versionType": "git"
},
{
"status": "affected",
"version": "776f742040ca5eb6242c60f29ac73d5752a5b621",
"lessThan": "99a948382af8a225e2d5e54a7052158cd6281cc6",
"versionType": "git"
}
],
"programFiles": [
"drivers/net/wireless/marvell/mwifiex/11n_rxreorder.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.5"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.5",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.265",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.216",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.183",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.151",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.103",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.44",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.8",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/net/wireless/marvell/mwifiex/11n_rxreorder.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-74488
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #33176 · Revision 1
- Added to Heist Feed
- Publisher date