GHSA-2G8G-2643-4335

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:

cpuidle: Skip governor when only one idle state is available

On certain platforms (PowerNV systems without a power-mgt DT node), cpuidle may register only a single idle state. In cases where that single state is a polling state (state 0), the ladder governor may incorrectly treat state 1 as the first usable state and pass an out-of-bounds index. This can lead to a NULL enter callback being invoked, ultimately resulting in a system crash.

[ 13.342636] cpuidle-powernv : Only Snooze is available [ 13.351854] Faulting instruction address: 0x00000000 [ 13.376489] NIP [0000000000000000] 0x0 [ 13.378351] LR [c000000001e01974] cpuidle_enter_state+0x2c4/0x668

Fix this by adding a bail-out in cpuidle_select() that returns state 0 directly when state_count <= 1, bypassing the governor and keeping the tick running.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-45968"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-27T14:17:13Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncpuidle: Skip governor when only one idle state is available\n\nOn certain platforms (PowerNV systems without a power-mgt DT node),\ncpuidle may register only a single idle state. In cases where that\nsingle state is a polling state (state 0), the ladder governor may\nincorrectly treat state 1 as the first usable state and pass an\nout-of-bounds index. This can lead to a NULL enter callback being\ninvoked, ultimately resulting in a system crash.\n\n[   13.342636] cpuidle-powernv : Only Snooze is available\n[   13.351854] Faulting instruction address: 0x00000000\n[   13.376489] NIP [0000000000000000] 0x0\n[   13.378351] LR  [c000000001e01974] cpuidle_enter_state+0x2c4/0x668\n\nFix this by adding a bail-out in cpuidle_select() that returns state 0\ndirectly when state_count \u003c= 1, bypassing the governor and keeping the\ntick running.",
  "id": "GHSA-2g8g-2643-4335",
  "modified": "2026-05-27T15:33:18Z",
  "published": "2026-05-27T15:33:18Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-45968"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4da2b897283c39980d6ae09dc1560fcd937879e5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5c577ac939bca486cb02069505cfe47a5312ce02"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5d103a38e2ae96eca57fd17161bcd29bd4622d1c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/63ae78336f40bcd9a44952a7c6bafb9c88a8effd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8f6833d919bae915ead6c599a53e81e19b32da52"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a0724e40a58a0e323c59707edeae5b71d15800dc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a0f7e804edc82e513d1ccb7c95ed8b351522ec81"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e5c9ffc6ae1bcdb1062527d611043681ac301aca"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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