CVE-2021-47083 (GCVE-0-2021-47083)

Vulnerability from cvelistv5 – Published: 2024-03-04 18:06 – Updated: 2026-08-05 08:45
VLAI
Title
pinctrl: mediatek: fix global-out-of-bounds issue
Summary
In the Linux kernel, the following vulnerability has been resolved: pinctrl: mediatek: fix global-out-of-bounds issue When eint virtual eint number is greater than gpio number, it maybe produce 'desc[eint_n]' size globle-out-of-bounds issue.
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-03-04 19:54 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6856 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: fb5fa8dc151b2364c975a9070eedb28a354a995a , < f373298e1bf0c6ea097c0bcc558dc43ad53e421f (git)
Affected: fb5fa8dc151b2364c975a9070eedb28a354a995a , < 441d3873664d170982922c5d2fc01fa89d9439ed (git)
Affected: fb5fa8dc151b2364c975a9070eedb28a354a995a , < fb563baa3eb8e7a15f2cff3c2695e2cca0493e69 (git)
Affected: fb5fa8dc151b2364c975a9070eedb28a354a995a , < 2d5446da5acecf9c67db1c9d55ae2c3e5de01f8d (git)
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Linux Linux Affected: 4.20
Unaffected: 0 , < 4.20 (semver)
Unaffected: 5.4.169 , ≤ 5.4.* (semver)
Unaffected: 5.10.89 , ≤ 5.10.* (semver)
Unaffected: 5.15.12 , ≤ 5.15.* (semver)
Unaffected: 5.16 , ≤ * (original_commit_for_fix)
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      "cve": "CVE-2021-47083",
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      "initial_release_date": "2021-01-01T00:00:00+00:00",
      "product_status:known_affected": "42",
      "product_status:known_not_affected": "156",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: pinctrl: mediatek: fix global-out-of-bounds issue",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47083.json",
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                    "id": "CVE-2021-47083",
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                    "timestamp": "2024-03-04T19:54:49.113562Z",
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                  "version": "0",
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                  "status": "unaffected",
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                  "status": "unaffected",
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                  "versionType": "original_commit_for_fix"
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              "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 \u0027desc[eint_n]\u0027 size globle-out-of-bounds issue."
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                  "value": "AV:L - The OOB is in MediaTek pinctrl EINT\u2192GPIO translation (`mtk_xt_get_gpio_n`), reached when a local caller requests an IRQ on a virtual GPIO (eint_n \u2265 npins) via `/dev/gpiochipN` line-event ioctls \u2192 `gpiod_to_irq` \u2192 `request_threaded_irq` \u2192 `mtk_eint_irq_request_resources`, not via network or physical plug-in paths.\nAC:L - On SoCs with virtual EINTs (e.g. mt8195 GPIO156\u2192eint 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\u2014only 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 \u2265 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."
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        "assignerShortName": "Linux",
        "cveId": "CVE-2021-47083",
        "datePublished": "2024-03-04T18:06:20.100Z",
        "dateReserved": "2024-02-29T22:33:44.298Z",
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}



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