{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2021-47135","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-03-04T18:12:48.840Z","datePublished":"2024-03-15T20:14:37.589Z","dateUpdated":"2026-08-05T08:46:15.392Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T08:46:15.392Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nmt76: mt7921: fix possible AOOB issue in mt7921_mcu_tx_rate_report\n\nFix possible array out of bound access in mt7921_mcu_tx_rate_report.\nRemove unnecessary varibable in mt7921_mcu_tx_rate_report"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The OOB access is in parsing an MCU firmware GET_WTBL response inside mt7921_mcu_tx_rate_report, not in processing injected WiFi frames or remote packets; exploitation requires local reachability of the mt7921 driver path on the host.\nAC:L - When rate_idx is out of range the out-of-bounds read is deterministic with no race or other condition outside the attacker’s influence once the MCU returns the malformed index.\nPR:L - An unprivileged local user can generate traffic on an already-associated mt7921 client interface, causing TX-free handling to queue the STA for mt7921_mac_sta_stats_work and the vulnerable MCU query without needing root.\nUI:N - The vulnerable path runs from kernel mac_work/watchdog after normal TX activity; no additional victim interaction is required.\nS:U - Impact stays within the host kernel’s authority; this is not a VM escape, IOMMU bypass, or other cross-boundary compromise.\nC:H - rate_idx is a u8 indexing rate[8], so large values read hundreds of bytes past the event into RX/heap memory, and derived fields are stored in STA tx_rate stats that can be exposed via nl80211 station reporting.\nI:H - Kernel array-index memory unsafety here yields corrupted kernel state (stats written from OOB-derived data) and, under the higher-severity rule for memory-corruption primitives, is treated as enabling integrity compromise rather than a pure crash.\nA:H - Large out-of-bounds reads can fault on invalid kernel addresses and oops/panic the host, so availability impact is complete loss of the system."}]}],"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/mt7921/mcu.c"],"versions":[{"version":"1c099ab44727c8e42fe4de4d91b53cec3ef02860","lessThan":"6919e8a24e70b6ba148fe07f44f835bcdd1a8d02","status":"affected","versionType":"git"},{"version":"1c099ab44727c8e42fe4de4d91b53cec3ef02860","lessThan":"d874e6c06952382897d35bf4094193cd44ae91bd","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/mt7921/mcu.c"],"versions":[{"version":"5.12","status":"affected"},{"version":"0","lessThan":"5.12","status":"unaffected","versionType":"semver"},{"version":"5.12.10","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":"5.12","versionEndExcluding":"5.12.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.12","versionEndExcluding":"5.13"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/6919e8a24e70b6ba148fe07f44f835bcdd1a8d02"},{"url":"https://git.kernel.org/stable/c/d874e6c06952382897d35bf4094193cd44ae91bd"}],"title":"mt76: mt7921: fix possible AOOB issue in mt7921_mcu_tx_rate_report","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2021-47135","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2024-03-18T15:32:01.197382Z"}}}],"providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2024-06-04T17:15:22.896Z"}},{"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2024-08-04T05:24:39.911Z"},"title":"CVE Program Container","references":[{"url":"https://git.kernel.org/stable/c/6919e8a24e70b6ba148fe07f44f835bcdd1a8d02","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/d874e6c06952382897d35bf4094193cd44ae91bd","tags":["x_transferred"]}]}]}}