GHSA-H63C-9R2V-9CMW

Vulnerability from github – Published: 2026-05-27 15:33 – Updated: 2026-05-27 15:33
VLAI
Details

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

power: supply: bq256xx: Fix use-after-free in power_supply_changed()

Using the devm_ variant for requesting IRQ before the devm_ variant for allocating/registering the power_supply handle, means that the power_supply handle will be deallocated/unregistered before the interrupt handler (since devm_ naturally deallocates in reverse allocation order). This means that during removal, there is a race condition where an interrupt can fire just after the power_supply handle has been freed, but just before the corresponding unregistration of the IRQ handler has run.

This will lead to the IRQ handler calling power_supply_changed() with a freed power_supply handle. Which usually crashes the system or otherwise silently corrupts the memory...

Note that there is a similar situation which can also happen during probe(); the possibility of an interrupt firing before registering the power_supply handle. This would then lead to the nasty situation of using the power_supply handle uninitialized in power_supply_changed().

Fix this racy use-after-free by making sure the IRQ is requested after the registration of the power_supply handle.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-45902"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-27T14:17:04Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\npower: supply: bq256xx: Fix use-after-free in power_supply_changed()\n\nUsing the `devm_` variant for requesting IRQ _before_ the `devm_`\nvariant for allocating/registering the `power_supply` handle, means that\nthe `power_supply` handle will be deallocated/unregistered _before_ the\ninterrupt handler (since `devm_` naturally deallocates in reverse\nallocation order). This means that during removal, there is a race\ncondition where an interrupt can fire just _after_ the `power_supply`\nhandle has been freed, *but* just _before_ the corresponding\nunregistration of the IRQ handler has run.\n\nThis will lead to the IRQ handler calling `power_supply_changed()` with\na freed `power_supply` handle. Which usually crashes the system or\notherwise silently corrupts the memory...\n\nNote that there is a similar situation which can also happen during\n`probe()`; the possibility of an interrupt firing _before_ registering\nthe `power_supply` handle. This would then lead to the nasty situation\nof using the `power_supply` handle *uninitialized* in\n`power_supply_changed()`.\n\nFix this racy use-after-free by making sure the IRQ is requested _after_\nthe registration of the `power_supply` handle.",
  "id": "GHSA-h63c-9r2v-9cmw",
  "modified": "2026-05-27T15:33:15Z",
  "published": "2026-05-27T15:33:15Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-45902"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4b6fb0b6124f558131e502e3ffd03e6583b3ace6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/74b5a88318db97d51bb40f774736553c2acd1514"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8005843369723d9c8975b7c4202d1b85d6125302"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/81d3688c9a2158329391e08f2d0b8ba204216044"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/83c27fdd696ac13d023ef7a0345301be93209c53"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8796910131a32ff29275052df768ef022929a394"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cb5c743936edcebc51880eeb6bf04979b5c9438b"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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