CVE-2022-50508 (GCVE-0-2022-50508)

Vulnerability from cvelistv5 – Published: 2025-10-04 15:43 – Updated: 2026-08-05 08:59
VLAI
Title
wifi: mt76: mt76x0: fix oob access in mt76x0_phy_get_target_power
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: mt76: mt76x0: fix oob access in mt76x0_phy_get_target_power After 'commit ba45841ca5eb ("wifi: mt76: mt76x02: simplify struct mt76x02_rate_power")', mt76x02 relies on ht[0-7] rate_power data for vht mcs{0,7}, while it uses vth[0-1] rate_power for vht mcs {8,9}. Fix a possible out-of-bound access in mt76x0_phy_get_target_power routine.
Severity
7.1 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: ba45841ca5eb29245f9c9f452a39586d9d68bc12 , < bf425c5d7ef6fb4083c1e0d46440f886127b5ee5 (git)
Affected: ba45841ca5eb29245f9c9f452a39586d9d68bc12 , < 6e1abc51c945663bddebfa1beb9590ff5b250eb7 (git)
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Linux Linux Affected: 6.2
Unaffected: 0 , < 6.2 (semver)
Unaffected: 6.2.3 , ≤ 6.2.* (semver)
Unaffected: 6.3 , ≤ * (original_commit_for_fix)
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          "programFiles": [
            "drivers/net/wireless/mediatek/mt76/mt76x0/phy.c"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mt76: mt76x0: fix oob access in mt76x0_phy_get_target_power\n\nAfter \u0027commit ba45841ca5eb (\"wifi: mt76: mt76x02: simplify struct\nmt76x02_rate_power\")\u0027, mt76x02 relies on ht[0-7] rate_power data for\nvht mcs{0,7}, while it uses vth[0-1] rate_power for vht mcs {8,9}.\nFix a possible out-of-bound access in mt76x0_phy_get_target_power routine."
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              "value": "AV:A - The bug is in mt76x0 TSSI TX-power calibration after the device itself transmits VHT frames; the highest-impact case is an mt76x0 SoftAP/hotspot where an adjacent WiFi peer\u2019s traffic drives VHT TX and the periodic cal_work path, matching Adjacent WiFi reachability used for similar mt76 SoftAP bugs.\nAC:L - On TSSI-enabled mt76x0 hardware, calibration runs on a fixed delayed-work interval and VHT MCS 2\u20139 indexing of the shrunk vht[2] array is deterministic once the radio is serving ordinary 802.11ac traffic; no attacker-uncontrollable race or rare debug config is required.\nPR:N - An adjacent client needs no host OS account or capability: open SoftAP/hotspot association plus data traffic is enough to cause the AP to TX VHT and exercise mt76x0_phy_get_target_power without authentication on the victim host.\nUI:N - Once SoftAP/hotspot is already running, the attacker triggers the path solely by associating and exchanging frames; no separate victim mount, open, or interactive step is required.\nS:U - The out-of-bounds access and resulting TX ALC mis-programming stay inside the host kernel WiFi driver authority and do not cross a VM, IOMMU, or sandbox boundary.\nC:L - This is a strictly bounded single-byte OOB read (vht[tx_rate] with tx_rate\u22649 into a 2-element array, at most ~7 bytes past rate_power into the adjacent cal fields). Per guidance that is not C:H, but the stale byte is folded into HW-visible TX power, so confidentiality is Low rather than None.\nI:N - The defect is a pure out-of-bounds read; the derived value only updates in-bounds cal.tssi_target and a clamped TX ALC register write, with no OOB write, UAF, or control-flow hijack primitive.\nA:H - The wrong VHT rate-power byte can swing TX ALC compensation across its full clamped range on a live SoftAP, which can severely disrupt or deny wireless availability for associated clients, and under the required upward rule this is scored High."
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}



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