CVE-2021-47028 (GCVE-0-2021-47028)

Vulnerability from cvelistv5 – Published: 2024-02-28 08:13 – Updated: 2026-08-05 08:45
VLAI
Title
mt76: mt7915: fix txrate reporting
Summary
In the Linux kernel, the following vulnerability has been resolved: mt76: mt7915: fix txrate reporting Properly check rate_info to fix unexpected reporting. [ 1215.161863] Call trace: [ 1215.164307] cfg80211_calculate_bitrate+0x124/0x200 [cfg80211] [ 1215.170139] ieee80211s_update_metric+0x80/0xc0 [mac80211] [ 1215.175624] ieee80211_tx_status_ext+0x508/0x838 [mac80211] [ 1215.181190] mt7915_mcu_get_rx_rate+0x28c/0x8d0 [mt7915e] [ 1215.186580] mt7915_mac_tx_free+0x324/0x7c0 [mt7915e] [ 1215.191623] mt7915_queue_rx_skb+0xa8/0xd0 [mt7915e] [ 1215.196582] mt76_dma_cleanup+0x7b0/0x11d0 [mt76] [ 1215.201276] __napi_poll+0x38/0xf8 [ 1215.204668] napi_workfn+0x40/0x80 [ 1215.208062] process_one_work+0x1fc/0x390 [ 1215.212062] worker_thread+0x48/0x4d0 [ 1215.215715] kthread+0x120/0x128 [ 1215.218935] ret_from_fork+0x10/0x1c
Severity
7.1 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 15:58 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6641 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: e57b7901469fc0b021930b83a8094baaf3d81b09 , < dfc8a71448c7d4fec38fb22bdc8a76d79c14b6da (git)
Affected: e57b7901469fc0b021930b83a8094baaf3d81b09 , < 4bd926e5ca88eac4d95eacb806b229f8729bc62e (git)
Affected: e57b7901469fc0b021930b83a8094baaf3d81b09 , < f43b941fd61003659a3f0e039595e5e525917aa8 (git)
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Linux Linux Affected: 5.8
Unaffected: 0 , < 5.8 (semver)
Unaffected: 5.11.21 , ≤ 5.11.* (semver)
Unaffected: 5.12.4 , ≤ 5.12.* (semver)
Unaffected: 5.13 , ≤ * (original_commit_for_fix)
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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\u201315 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-\u003ebitrates (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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        "assignerShortName": "Linux",
        "cveId": "CVE-2021-47028",
        "datePublished": "2024-02-28T08:13:39.004Z",
        "dateReserved": "2024-02-27T18:42:55.961Z",
        "dateUpdated": "2026-08-05T08:45:37.722Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
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  }
}



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