{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-74488","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-08-15T05:44:03.905Z","datePublished":"2026-08-15T12:27:18.867Z","dateUpdated":"2026-08-19T16:37:43.361Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-19T16:37:43.361Z"},"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->len, the\nlength of the A-MSDU parent, instead of rx_skb->len:\n\n\trx_skb = __skb_dequeue(&list);\n\trx_hdr = (struct rx_packet_hdr *)rx_skb->data;\n\tif (ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info) &&\n\t    ntohs(rx_hdr->eth803_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->len);\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->len is a use-after-free. When it is reused, skb->len 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 < end; pos += 2 + pos[1]) {\n\t\tu8 ie_len = pos[1];\n\n\t\tif (pos + 2 + ie_len > 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->len, the length of the subframe actually being parsed."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH"},"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->len 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."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/wireless/marvell/mwifiex/11n_rxreorder.c"],"versions":[{"version":"776f742040ca5eb6242c60f29ac73d5752a5b621","lessThan":"707664027bb9307f7268eda403af7c4ccd9b8644","status":"affected","versionType":"git"},{"version":"776f742040ca5eb6242c60f29ac73d5752a5b621","lessThan":"3b02275833a0d3e6583627995d614fa99bdf364f","status":"affected","versionType":"git"},{"version":"776f742040ca5eb6242c60f29ac73d5752a5b621","lessThan":"a1f0f7dc7eb15754e6931b433edb7beb754c996a","status":"affected","versionType":"git"},{"version":"776f742040ca5eb6242c60f29ac73d5752a5b621","lessThan":"25e5a3fe4f15e30f74eca42cbf3bcc3a3fbeda79","status":"affected","versionType":"git"},{"version":"776f742040ca5eb6242c60f29ac73d5752a5b621","lessThan":"ece2ebb34247d573142617dfc534a9dc11ba59be","status":"affected","versionType":"git"},{"version":"776f742040ca5eb6242c60f29ac73d5752a5b621","lessThan":"c9dcfe6b8b71369e1d732e2ff622c3696a2f032c","status":"affected","versionType":"git"},{"version":"776f742040ca5eb6242c60f29ac73d5752a5b621","lessThan":"5a21ab03829cb6d2682c127f22e2b9cd63b4393f","status":"affected","versionType":"git"},{"version":"776f742040ca5eb6242c60f29ac73d5752a5b621","lessThan":"99a948382af8a225e2d5e54a7052158cd6281cc6","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/wireless/marvell/mwifiex/11n_rxreorder.c"],"versions":[{"version":"4.5","status":"affected"},{"version":"0","lessThan":"4.5","status":"unaffected","versionType":"semver"},{"version":"5.10.265","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.216","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.183","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.151","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.103","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.44","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.1.8","lessThanOrEqual":"7.1.*","status":"unaffected","versionType":"semver"},{"version":"7.2","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.5","versionEndExcluding":"5.10.265"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.5","versionEndExcluding":"5.15.216"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.5","versionEndExcluding":"6.1.183"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.5","versionEndExcluding":"6.6.151"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.5","versionEndExcluding":"6.12.103"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.5","versionEndExcluding":"6.18.44"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.5","versionEndExcluding":"7.1.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.5","versionEndExcluding":"7.2"}]}]}],"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"}}}}