{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2021-47028","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-02-27T18:42:55.961Z","datePublished":"2024-02-28T08:13:39.004Z","dateUpdated":"2026-08-05T08:45:37.722Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T08:45:37.722Z"},"descriptions":[{"lang":"en","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"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H","baseScore":7.1,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","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."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/wireless/mediatek/mt76/mt7915/mcu.c"],"versions":[{"version":"e57b7901469fc0b021930b83a8094baaf3d81b09","lessThan":"dfc8a71448c7d4fec38fb22bdc8a76d79c14b6da","status":"affected","versionType":"git"},{"version":"e57b7901469fc0b021930b83a8094baaf3d81b09","lessThan":"4bd926e5ca88eac4d95eacb806b229f8729bc62e","status":"affected","versionType":"git"},{"version":"e57b7901469fc0b021930b83a8094baaf3d81b09","lessThan":"f43b941fd61003659a3f0e039595e5e525917aa8","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/mediatek/mt76/mt7915/mcu.c"],"versions":[{"version":"5.8","status":"affected"},{"version":"0","lessThan":"5.8","status":"unaffected","versionType":"semver"},{"version":"5.11.21","lessThanOrEqual":"5.11.*","status":"unaffected","versionType":"semver"},{"version":"5.12.4","lessThanOrEqual":"5.12.*","status":"unaffected","versionType":"semver"},{"version":"5.13","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":"5.8","versionEndExcluding":"5.11.21"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.8","versionEndExcluding":"5.12.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.8","versionEndExcluding":"5.13"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/dfc8a71448c7d4fec38fb22bdc8a76d79c14b6da"},{"url":"https://git.kernel.org/stable/c/4bd926e5ca88eac4d95eacb806b229f8729bc62e"},{"url":"https://git.kernel.org/stable/c/f43b941fd61003659a3f0e039595e5e525917aa8"}],"title":"mt76: mt7915: fix txrate reporting","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2024-08-04T05:24:39.908Z"},"title":"CVE Program Container","references":[{"url":"https://git.kernel.org/stable/c/dfc8a71448c7d4fec38fb22bdc8a76d79c14b6da","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/4bd926e5ca88eac4d95eacb806b229f8729bc62e","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/f43b941fd61003659a3f0e039595e5e525917aa8","tags":["x_transferred"]}]},{"metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2021-47028","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2024-09-10T15:58:03.010297Z"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2024-09-11T17:33:24.251Z"}}]}}