CVE-2026-80751 (GCVE-0-2026-80751)

Vulnerability from cvelistv5 – Published: 2026-09-03 08:26 – Updated: 2026-09-04 04:58
VLAI
Title
pmdomain: mediatek: mfg: initialize prev_o in mtk_mfg_attach_dev()
Summary
In the Linux kernel, the following vulnerability has been resolved: pmdomain: mediatek: mfg: initialize prev_o in mtk_mfg_attach_dev() mtk_mfg_attach_dev() reads prev_o on the first iteration of its loop, in "if (prev_o && prev_o->freq == o->freq)", before prev_o is assigned at the end of the loop body. On that first iteration, evaluating prev_o reads an indeterminate value. If it is non-NULL, the condition dereferences a stale or invalid pointer, potentially faulting or incorrectly skipping the first OPP. Initialize prev_o to NULL. This matches the intent as well: there is no previous OPP to compare against on the first iteration. Found with Clang's -Wconditional-uninitialized.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f08e7a4e8d6ac4de677727af352ea33c6ce9f444 , < de4eec0dfde8c0e27f8915bbb244d17ff68f2fb4 (git)
Affected: f08e7a4e8d6ac4de677727af352ea33c6ce9f444 , < 090a95dbe13df9965279b588d97eda134831769c (git)
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Linux Linux Affected: 6.19
Unaffected: 0 , < 6.19 (semver)
Unaffected: 7.1.10 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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          "product": "Linux",
          "programFiles": [
            "drivers/pmdomain/mediatek/mtk-mfg-pmdomain.c"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npmdomain: mediatek: mfg: initialize prev_o in mtk_mfg_attach_dev()\n\nmtk_mfg_attach_dev() reads prev_o on the first iteration of its loop,\nin \"if (prev_o \u0026\u0026 prev_o-\u003efreq == o-\u003efreq)\", before prev_o is assigned\nat the end of the loop body. On that first iteration, evaluating prev_o\nreads an indeterminate value. If it is non-NULL, the condition\ndereferences a stale or invalid pointer, potentially faulting or\nincorrectly skipping the first OPP.\n\nInitialize prev_o to NULL. This matches the intent as well: there is no\nprevious OPP to compare against on the first iteration.\n\nFound with Clang\u0027s -Wconditional-uninitialized."
        }
      ],
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
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              "value": "AV:L - mtk_mfg_attach_dev() is only reached from the local kernel genpd attach path (panthor/Mali GPU probe \u2192 devm_pm_domain_attach_list \u2192 genpd_add_device) on MediaTek MT8196/MT6991 SoCs; there is no network, Bluetooth, or USB/physical-bus packet handler into this MFlexGraphics pmdomain code.\nAC:L - On the first loop iteration prev_o is read before assignment; on typical ARM64 kernel stacks the uninitialized slot frequently holds non-zero garbage, so the stale prev_o-\u003efreq dereference is reached deterministically during GPU power-domain attach at boot without races or attacker-uncontrollable timing.\nPR:L - The vulnerable path runs automatically when the Mali/panthor GPU binds to the MediaTek MFG genpd during boot on MT8196/MT6991 phones, Chromebooks, and embedded boards; sysfs driver rebind also reaches it with only local administrator access, not init-namespace root beyond ordinary local privilege.\nUI:N - No victim interaction such as opening files, mounting filesystems, or clicking prompts is required; GPU power-domain attachment and OPP registration occur automatically as part of normal platform driver probe during system bring-up.\nS:U - Impact is confined to kernel GPU power-domain and OPP setup on the same host; it does not cross VM, container, IOMMU, or firmware trust boundaries in a way that changes CVSS scope.\nC:H - When the uninitialized prev_o is non-NULL the kernel dereferences a stale stack-derived pointer to read dev_pm_opp_data.freq, exposing contents from an attacker-uncontrolled kernel address; CNA guidance treats invalid-pointer reads as high confidentiality impact.\nI:H - Beyond the stray read, incorrectly skipping the first OPP corrupts the dynamically built GPU dev_pm_opp table used by devfreq and DVFS consumers, constituting kernel memory integrity compromise that can be leveraged for further exploitation on Mali GPU deployments.\nA:H - Dereferencing a stale or invalid prev_o during GPU attach can cause an immediate kernel OOPS/panic, failing Mali/panthor probe and denying GPU availability on affected MediaTek devices until reboot or driver recovery."
            }
          ]
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      "providerMetadata": {
        "dateUpdated": "2026-09-04T04:58:31.507Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/de4eec0dfde8c0e27f8915bbb244d17ff68f2fb4"
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          "url": "https://git.kernel.org/stable/c/090a95dbe13df9965279b588d97eda134831769c"
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    "cveId": "CVE-2026-80751",
    "datePublished": "2026-09-03T08:26:31.347Z",
    "dateReserved": "2026-08-26T14:34:25.790Z",
    "dateUpdated": "2026-09-04T04:58:31.507Z",
    "state": "PUBLISHED"
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      "date": "2026-09-21",
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          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npmdomain: mediatek: mfg: initialize prev_o in mtk_mfg_attach_dev()\n\nmtk_mfg_attach_dev() reads prev_o on the first iteration of its loop,\nin \"if (prev_o \u0026\u0026 prev_o-\u003efreq == o-\u003efreq)\", before prev_o is assigned\nat the end of the loop body. On that first iteration, evaluating prev_o\nreads an indeterminate value. If it is non-NULL, the condition\ndereferences a stale or invalid pointer, potentially faulting or\nincorrectly skipping the first OPP.\n\nInitialize prev_o to NULL. This matches the intent as well: there is no\nprevious OPP to compare against on the first iteration.\n\nFound with Clang\u0027s -Wconditional-uninitialized."
          }
        ],
        "id": "CVE-2026-80751",
        "lastModified": "2026-09-04T05:17:15.100",
        "metrics": {
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                "attackVector": "LOCAL",
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                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
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              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    }
  }
}



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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

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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.
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  • 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.


Detection rules are retrieved from Rulezet.


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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.