{ "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" } } ] } }