{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2021-47083","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-02-29T22:33:44.298Z","datePublished":"2024-03-04T18:06:20.100Z","dateUpdated":"2026-08-05T08:45:54.954Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T08:45:54.954Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\npinctrl: mediatek: fix global-out-of-bounds issue\n\nWhen eint virtual eint number is greater than gpio number,\nit maybe produce 'desc[eint_n]' size globle-out-of-bounds issue."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","baseScore":7.1,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The OOB is in MediaTek pinctrl EINT→GPIO translation (`mtk_xt_get_gpio_n`), reached when a local caller requests an IRQ on a virtual GPIO (eint_n ≥ npins) via `/dev/gpiochipN` line-event ioctls → `gpiod_to_irq` → `request_threaded_irq` → `mtk_eint_irq_request_resources`, not via network or physical plug-in paths.\nAC:L - On SoCs with virtual EINTs (e.g. mt8195 GPIO156→eint 216 with npins=165), requesting edge detection on that line always indexes `desc[eint_n]` past the pin table; the attacker fully controls the trigger with no race or uncontrollable layout dependency.\nPR:L - The gpio chardev ioctl path has no capability check—only DAC on `/dev/gpiochipN`, which on MediaTek phones, Chromebooks, IoT, and factory systems is commonly granted to non-root (gpio group/seat), matching prior gpiochip scoring (e.g. CVE-2022-48660); user-namespace root is not required.\nUI:N - The attacker opens the gpiochip device and issues the line-event/edge ioctl themselves; no separate victim action is required.\nS:U - Impact is confined to host-kernel memory safety within the same OS privilege domain; this is not a VM escape, IOMMU bypass, or other cross-authority boundary crossing.\nC:H - The bug is a global out-of-bounds read of `desc[eint_n]` (and follow-on pin-desc fields on the false-match path); per kernel OOB-read guidance this is Confidentiality High.\nI:N - The defect itself is an OOB read with no OOB write; a false greedy match yields gpio_n ≥ ngpio and fails `gpiochip_lock_as_irq` before `set_gpio_as_eint`/`mtk_hw_set_value`, so there is no write or control-flow integrity primitive.\nA:H - Global OOB access is a kernel memory-safety violation that KASAN/hardened builds treat as oops-class failures, and a false-match path can drive `mtk_hw_get_value` with garbage register indices producing further faults, so availability impact is High."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c"],"versions":[{"version":"fb5fa8dc151b2364c975a9070eedb28a354a995a","lessThan":"f373298e1bf0c6ea097c0bcc558dc43ad53e421f","status":"affected","versionType":"git"},{"version":"fb5fa8dc151b2364c975a9070eedb28a354a995a","lessThan":"441d3873664d170982922c5d2fc01fa89d9439ed","status":"affected","versionType":"git"},{"version":"fb5fa8dc151b2364c975a9070eedb28a354a995a","lessThan":"fb563baa3eb8e7a15f2cff3c2695e2cca0493e69","status":"affected","versionType":"git"},{"version":"fb5fa8dc151b2364c975a9070eedb28a354a995a","lessThan":"2d5446da5acecf9c67db1c9d55ae2c3e5de01f8d","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/pinctrl/mediatek/pinctrl-mtk-common-v2.c"],"versions":[{"version":"4.20","status":"affected"},{"version":"0","lessThan":"4.20","status":"unaffected","versionType":"semver"},{"version":"5.4.169","lessThanOrEqual":"5.4.*","status":"unaffected","versionType":"semver"},{"version":"5.10.89","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.12","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"5.16","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":"4.20","versionEndExcluding":"5.4.169"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"5.10.89"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"5.15.12"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"5.16"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/f373298e1bf0c6ea097c0bcc558dc43ad53e421f"},{"url":"https://git.kernel.org/stable/c/441d3873664d170982922c5d2fc01fa89d9439ed"},{"url":"https://git.kernel.org/stable/c/fb563baa3eb8e7a15f2cff3c2695e2cca0493e69"},{"url":"https://git.kernel.org/stable/c/2d5446da5acecf9c67db1c9d55ae2c3e5de01f8d"}],"title":"pinctrl: mediatek: fix global-out-of-bounds issue","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2021-47083","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2024-03-04T19:54:49.113562Z"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2024-07-05T17:22:07.207Z"}},{"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2024-08-04T05:24:39.666Z"},"title":"CVE Program Container","references":[{"url":"https://git.kernel.org/stable/c/f373298e1bf0c6ea097c0bcc558dc43ad53e421f","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/441d3873664d170982922c5d2fc01fa89d9439ed","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/fb563baa3eb8e7a15f2cff3c2695e2cca0493e69","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/2d5446da5acecf9c67db1c9d55ae2c3e5de01f8d","tags":["x_transferred"]}]}]}}