hwmon: (pmbus/q54sj108a2) fix stack overflow in debugfs read_CVE-2026-43380

{
    "lastseen": "",
    "description": "In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (pmbus/q54sj108a2) fix stack overflow in debugfs read\n\nThe q54sj108a2_debugfs_read function suffers from a stack buffer overflow\ndue to incorrect arguments passed to bin2hex(). The function currently\npasses 'data' as the destination and 'data_char' as the source.\n\nBecause bin2hex() converts each input byte into two hex characters, a\n32-byte block read results in 64 bytes of output. Since 'data' is only\n34 bytes (I2C_SMBUS_BLOCK_MAX + 2), this writes 30 bytes past the end\nof the buffer onto the stack.\n\nAdditionally, the arguments were swapped: it was reading from the\nzero-initialized 'data_char' and writing to 'data', resulting in\nall-zero output regardless of the actual I2C read.\n\nFix this by:\n1. Expanding 'data_char' to 66 bytes to safely hold the hex output.\n2. Correcting the bin2hex() argument order and using the actual read count.\n3. Using a pointer to select the correct output buffer for the final\n   simple_read_from_buffer call.",
    "published": "2026-05-08T14:21:28.702Z",
    "modified": "2026-05-20T16:08:07.058Z",
    "type": "cve",
    "title": "hwmon: (pmbus/q54sj108a2) fix stack overflow in debugfs read",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/a0fc1b9c738fba231f190ab960c83202722efee5\nhttps://git.kernel.org/stable/c/c59090c50f62a17129fc4c5407bc4071305a9e82\nhttps://git.kernel.org/stable/c/52db5ef163c96f916d424e472fb17aadc35a9f7a\nhttps://git.kernel.org/stable/c/b48a0f8d4541a4f6651dc9a64430ce9fdf5c120b\nhttps://git.kernel.org/stable/c/73a7a345816946d276ad2c46c8bb771de67cfc46\nhttps://git.kernel.org/stable/c/24a7b9daa103fa963b3fd37d8805b23e01621976\nhttps://git.kernel.org/stable/c/25dd70a03b1f5f3aa71e1a5091ecd9cd2a13ee43",
    "id": "CVE-2026-43380",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux d014538aa38561cd24c5eb228223585f26c5ec71\nLinux Linux d014538aa38561cd24c5eb228223585f26c5ec71\nLinux Linux d014538aa38561cd24c5eb228223585f26c5ec71\nLinux Linux d014538aa38561cd24c5eb228223585f26c5ec71\nLinux Linux d014538aa38561cd24c5eb228223585f26c5ec71\nLinux Linux d014538aa38561cd24c5eb228223585f26c5ec71\nLinux Linux d014538aa38561cd24c5eb228223585f26c5ec71\nLinux Linux 5.11",
    "sourceHref": "",
    "cvss": {
        "score": 7.8,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
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        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
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            "baseScore": 0,
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            "privilegesRequired": "",
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            "confidentialityImpact": "",
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            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Linux",
    "version": "d014538aa38561cd24c5eb228223585f26c5ec71",
    "vendor": "Linux",
    "ai_description": "",
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    "ai_score": 0
}