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vuln-cve/data/2024/35xxx/CVE-2024-35789.json
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{
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"cveId": "CVE-2024-35789",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2024-05-17T12:19:12.338Z",
"datePublished": "2024-05-17T12:24:42.323Z",
"dateUpdated": "2026-10-15T00:40:48.629Z"
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: check/clear fast rx for non-4addr sta VLAN changes\n\nWhen moving a station out of a VLAN and deleting the VLAN afterwards, the\nfast_rx entry still holds a pointer to the VLAN's netdev, which can cause\nuse-after-free bugs. Fix this by immediately calling ieee80211_check_fast_rx\nafter the VLAN change."
}
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"value": "AV:A - The stale `fast_rx->dev` is dereferenced in the 802.11 receive fast path (`ieee80211_rx_8023`) when processing a data frame from the affected station, so the attacker must be an associated WiFi client within radio range of the AP. This is link-local 802.11 reachability, not routable network reach, hence Adjacent.\nAC:L - Once the station has been moved out of a VLAN that is subsequently deleted, every subsequent data frame the attacker transmits deterministically dereferences the freed netdev — there is no race to win and no memory layout the attacker cannot influence. In a hostapd dynamic-VLAN deployment the attacker induces the move itself by reauthenticating into a different RADIUS-assigned VLAN, and can repeat the sequence at will.\nPR:L - `ieee80211_check_fast_rx` only installs a `fast_rx` entry for a station with `WLAN_STA_AUTHORIZED` and a CCMP/GCMP PTK, so the attacker must be an authenticated, authorized client of the WLAN. That is an ordinary low-privileged network user, not an administrator.\nUI:N - No victim action is needed — the VLAN reassignment and teardown are performed automatically by hostapd in response to the attacker's own (re)authentication, and the attacker's own transmitted frames trigger the dereference.\nS:U - The use-after-free corrupts kernel memory and is exploited within the kernel's own security authority on the AP; there is no hypervisor, IOMMU, or sandbox boundary crossed.\nC:H - The freed `struct net_device` is read for `->tstats`, `->dev_addr` and `->nd_net`, and the skb is delivered into the stack using that stale pointer, so a groomed reclaim yields controlled kernel reads and misdirected traffic delivery; if the slot is reused by a live netdev, the station's frames leak into a different VLAN, defeating the segmentation the VLAN exists to enforce.\nI:H - `dev_sw_netstats_rx_add(fast_rx->dev, skb->len)` reads a per-CPU pointer out of the freed object and writes `rx_bytes += skb->len` (attacker-chosen length) plus `rx_packets++` through it, giving a repeatable, attacker-influenced arbitrary-increment write primitive; combined with the UAF read this is exploitable for control-flow hijacking, and the stale `dev` also permits frame injection into the wrong VLAN.\nA:H - Dereferencing a freed `net_device` from RX softirq context — including an indirect write through a dangling `->tstats` and passing the freed device to `eth_type_trans`/`netif_receive_skb` — reliably oopses or panics the access point kernel on the first frame after VLAN teardown."
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