221 lines
12 KiB
JSON
221 lines
12 KiB
JSON
{
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"cveId": "CVE-2021-47028",
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"dateReserved": "2024-02-27T18:42:55.961Z",
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"datePublished": "2024-02-28T08:13:39.004Z",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmt76: mt7915: fix txrate reporting\n\nProperly check rate_info to fix unexpected reporting.\n\n[ 1215.161863] Call trace:\n[ 1215.164307] cfg80211_calculate_bitrate+0x124/0x200 [cfg80211]\n[ 1215.170139] ieee80211s_update_metric+0x80/0xc0 [mac80211]\n[ 1215.175624] ieee80211_tx_status_ext+0x508/0x838 [mac80211]\n[ 1215.181190] mt7915_mcu_get_rx_rate+0x28c/0x8d0 [mt7915e]\n[ 1215.186580] mt7915_mac_tx_free+0x324/0x7c0 [mt7915e]\n[ 1215.191623] mt7915_queue_rx_skb+0xa8/0xd0 [mt7915e]\n[ 1215.196582] mt76_dma_cleanup+0x7b0/0x11d0 [mt76]\n[ 1215.201276] __napi_poll+0x38/0xf8\n[ 1215.204668] napi_workfn+0x40/0x80\n[ 1215.208062] process_one_work+0x1fc/0x390\n[ 1215.212062] worker_thread+0x48/0x4d0\n[ 1215.215715] kthread+0x120/0x128\n[ 1215.218935] ret_from_fork+0x10/0x1c"
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"value": "AV:A - The vulnerable mt7915 TX-rate parse path runs while an MT7915 AP/client exchanges traffic with wireless peers and consumes MCU rate-report events generated for those stations. An attacker in WiFi radio range is the highest reasonable reachability, not a routable IP service or local-only syscall.\nAC:L - On 5 GHz, firmware OFDM rate encodings use hw_values 8–15 that the old code indexed directly into an 8-entry bitrates array, so the out-of-bounds read occurs during ordinary legacy rate reporting. Invalid HT/VHT/HE fields likewise reach cfg80211_calculate_bitrate without attacker-independent races.\nPR:N - An adjacent wireless peer needs no account or capability on the victim host; rate reports and TX completion are driven by normal WiFi traffic to that peer. Association/auth on the air is not an OS privilege held by the attacker.\nUI:N - Once the MT7915 interface is operating, firmware rate events and TX-status handling run asynchronously in the driver NAPI/work path. No victim action such as opening a file or mounting a filesystem is required.\nS:U - Impact stays inside the host kernel wireless stack and does not cross a VM, IOMMU, or other separate security authority.\nC:L - The CCK/OFDM path performs a strictly bounded out-of-bounds read past sband->bitrates (at most a few ieee80211_rate slots of static module data) and stores the result in tx_rate.legacy exposed via station bitrate reporting. This is a small bounded leak, not an arbitrary read primitive.\nI:N - The bug only mis-parses and stores rate_info and can WARN in bitrate calculation; there is no out-of-bounds write, UAF, or other modification/control-flow primitive.\nA:H - Unchecked HT/VHT/HE MCS and HE GI values are passed into cfg80211_calculate_bitrate, which hits WARN_ON/WARN_ONCE as shown in the CVE call trace, and on panic_on_warn or similar hardened setups this is a kernel panic-class denial of service."
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}
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]
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}
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