{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-38408",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2025-38408"
  ],
  "published": "2025-07-25T13:09:05Z",
  "summary": "genirq/irq_sim: Initialize work context pointers properly",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ngenirq/irq_sim: Initialize work context pointers properly\n\nInitialize `ops` member's pointers properly by using kzalloc() instead of\nkmalloc() when allocating the simulation work context. Otherwise the\npointers contain random content leading to invalid dereferencing.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-38408"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/186df821de0f34490ed5fc0861243748b2483861"
    },
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      "url": "https://git.kernel.org/stable/c/c71aa4bb528ae6f8fd7577a0a39e5a03c60b04fb"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ec3656a8cb428d763def32bc2fa695f94be23629"
    },
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      "url": "https://git.kernel.org/stable/c/19bd7597858dd15802c1d99fcc38e528f469080a"
    },
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      "url": "https://git.kernel.org/stable/c/7f73d1def72532bac4d55ea8838f457a6bed955c"
    },
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      "url": "https://git.kernel.org/stable/c/8a2277a3c9e4cc5398f80821afe7ecbe9bdf2819"
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  "database_specific": {
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    "upstream_modified": "2026-08-05T12:19:11Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The vulnerable code is reached through a local ioctl on the GPIO character device (/dev/gpiochipN) exposed by the gpio-mockup simulator, or via the local iio-dummy device; there is no network-facing path to irq_sim.\nAC:L - A single GPIO_V2_GET_LINE_IOCTL with an edge-detect flag deterministically drives request_threaded_irq() into irq_sim_request_resources(), which unconditionally tests and calls the uninitialized ops pointer on every request; the attacker can additionally groom the kmalloc-96 slab to shape the stale contents.\nPR:L - An unprivileged local account with access to the GPIO chardev \u2014 routinely granted via the \"gpio\" group udev rule on embedded, IoT and automation systems \u2014 can request an edge-triggered line and reach the wild call; no root or capability is required for the triggering ioctl.\nUI:N - The attacker triggers the faulty indirect call entirely through their own ioctl/close sequence; no action by another user or administrator is needed.\nS:U - The uninitialized function-pointer call executes in kernel context on the same host and does not cross a virtualization, IOMMU, or sandbox authority boundary.\nC:H - Branching to an attacker-groomable stale heap value is a direct control-flow hijack primitive that can be leveraged into arbitrary kernel memory disclosure; the call also leaks the state of recycled slab memory into control flow.\nI:H - Calling through an uninitialized function pointer whose backing slab object can be sprayed with attacker-controlled data yields instruction-pointer control and hence arbitrary kernel code execution and memory modification.\nA:H - Even without successful grooming, the indirect branch to stale garbage causes an immediate kernel oops or CFI panic, and it can be triggered repeatedly."
    }
  }
}