GHSA-852J-FQFH-MMQJ

Vulnerability from github – Published: 2026-10-18 18:31 – Updated: 2026-10-30 15:33
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

iio: adc: ad_sigma_delta: fix use-after-free on unbind

ad_sd_buffer_postenable() allocates sigma_delta->samples_buf with devm_krealloc() at runtime, so its devres entry sits after all probe-time entries of the driver. devm resources are released in reverse allocation order, which means unbind frees samples_buf before iio_device_unregister() disables the buffers and detaches the trigger pollfunc. The data ready IRQ is still enabled at that point, so ad_sd_trigger_handler() can still run and memcpy() incoming samples into the freed samples_buf.

Fix this by preallocating the buffer in devm_ad_sd_setup_buffer_and_trigger(), before the triggered buffer and the IRQ are set up, so it is freed only after iio_device_unregister() has drained the trigger handler via free_irq(). Size it for the worst case of all sequencer slots being active; ad_sd_validate_scan_mask() already caps the number of active channels at num_slots.

This issue was found by an in-house static analysis tool.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-98677"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-18T16:17:21Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\niio: adc: ad_sigma_delta: fix use-after-free on unbind\n\nad_sd_buffer_postenable() allocates sigma_delta-\u003esamples_buf with\ndevm_krealloc() at runtime, so its devres entry sits after all\nprobe-time entries of the driver. devm resources are released in\nreverse allocation order, which means unbind frees samples_buf before\niio_device_unregister() disables the buffers and detaches the trigger\npollfunc. The data ready IRQ is still enabled at that point, so\nad_sd_trigger_handler() can still run and memcpy() incoming samples\ninto the freed samples_buf.\n\nFix this by preallocating the buffer in\ndevm_ad_sd_setup_buffer_and_trigger(), before the triggered buffer and\nthe IRQ are set up, so it is freed only after iio_device_unregister()\nhas drained the trigger handler via free_irq(). Size it for the worst\ncase of all sequencer slots being active; ad_sd_validate_scan_mask()\nalready caps the number of active channels at num_slots.\n\nThis issue was found by an in-house static analysis tool.",
  "id": "GHSA-852j-fqfh-mmqj",
  "modified": "2026-10-30T15:33:55Z",
  "published": "2026-10-18T18:31:59Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98677"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5663c72bf400231e90777982216797191887a6b9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/84500ae0d976995a6870cb1dca2d124b6b2d6e5a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/975b09bc680acc60903777b766cdb53b0bf9c9f6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9ee8306121495d2a25aa5d1bfd519f2748786b83"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b2a991d33f1e2207052fe745d1fe459db8b365e2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f20b94a7dc1ff9ade191ce839c984210fdbdc653"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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