{
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  "id": "RPI-CVE-2025-68167",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2025-68167"
  ],
  "published": "2025-12-16T13:43:51Z",
  "summary": "gpiolib: fix invalid pointer access in debugfs",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ngpiolib: fix invalid pointer access in debugfs\n\nIf the memory allocation in gpiolib_seq_start() fails, the s->private\nfield remains uninitialized and is later dereferenced without checking\nin gpiolib_seq_stop(). Initialize s->private to NULL before calling\nkzalloc() and check it before dereferencing it.",
  "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-2025-68167"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/70180a6031056096c93ed2f47c41803268bdd91c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3c91c8f424d3e44c8645ab765a38773e58afb07d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2f6115ad8864cf3f48598f26c74c7c8e5c391919"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T12:19:11Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The vulnerability is reached only by reading the local debugfs file /sys/kernel/debug/gpio; there is no network or remote path into gpiolib's seq_file handlers.\nAC:L - The attacker fully controls both required conditions \u2014 memory pressure to make the small GFP_KERNEL kzalloc fail, and unbounded repetition of read()/lseek() on the file, each of which drives multiple start/stop cycles \u2014 so the failure can simply be retried until it lands.\nPR:L - The gpio debugfs file is explicitly created world-readable (mode 0444) and needs no capability, so any unprivileged local user reaches it on the many embedded, automotive, industrial and Android deployments that mount debugfs traversable (mode=755 or uid/gid options), which is common precisely because GPIO debugging is the reason debugfs is mounted there.\nUI:N - The attacker triggers the bug entirely through their own read() calls on the debugfs file; no action by any other user or victim process is needed.\nS:U - The corruption stays within the kernel's own security authority \u2014 freed slab memory and per-CPU SRCU counters \u2014 with no crossing of a VM, IOMMU or sandbox boundary.\nC:H - gpiolib_seq_stop() reads priv->idx out of an already-freed kmalloc-16 object, and the accompanying double free corrupts the slab freelist, enabling overlapping allocations that yield arbitrary kernel memory disclosure.\nI:H - The stale idx is fed unvalidated into __srcu_read_unlock(), producing this_cpu_inc() at an attacker-influenced out-of-bounds offset from the per-CPU srcu_data, and the subsequent kfree() of an object owned by another allocation is a classic double-free write primitive.\nA:H - On the first iteration s->private is NULL, so gpiolib_seq_stop() dereferences NULL and oopses; on later iterations the use-after-free, wild per-CPU increment and double free reliably panic the kernel."
    }
  }
}