CVE-2021-47083 (GCVE-0-2021-47083)
Vulnerability from cvelistv5 – Published: 2024-03-04 18:06 – Updated: 2026-08-05 08:45
VLAI
EPSS
VEX
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)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-03-04 19:54 UTC
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
fb5fa8dc151b2364c975a9070eedb28a354a995a , < f373298e1bf0c6ea097c0bcc558dc43ad53e421f
(git)
Affected: fb5fa8dc151b2364c975a9070eedb28a354a995a , < 441d3873664d170982922c5d2fc01fa89d9439ed (git) Affected: fb5fa8dc151b2364c975a9070eedb28a354a995a , < fb563baa3eb8e7a15f2cff3c2695e2cca0493e69 (git) Affected: fb5fa8dc151b2364c975a9070eedb28a354a995a , < 2d5446da5acecf9c67db1c9d55ae2c3e5de01f8d (git) |
guessed | |
| 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) |
guessed |
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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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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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