CVE-2026-45968 (GCVE-0-2026-45968)

Vulnerability from cvelistv5 – Published: 2026-05-27 12:18 – Updated: 2026-05-27 12:18
VLAI
Title
cpuidle: Skip governor when only one idle state is available
Summary
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: dc2251bf98c66db3f4e055b751968f0871037ae4 , < a0f7e804edc82e513d1ccb7c95ed8b351522ec81 (git)
Affected: dc2251bf98c66db3f4e055b751968f0871037ae4 , < 5d103a38e2ae96eca57fd17161bcd29bd4622d1c (git)
Affected: dc2251bf98c66db3f4e055b751968f0871037ae4 , < 4da2b897283c39980d6ae09dc1560fcd937879e5 (git)
Affected: dc2251bf98c66db3f4e055b751968f0871037ae4 , < 5c577ac939bca486cb02069505cfe47a5312ce02 (git)
Affected: dc2251bf98c66db3f4e055b751968f0871037ae4 , < 8f6833d919bae915ead6c599a53e81e19b32da52 (git)
Affected: dc2251bf98c66db3f4e055b751968f0871037ae4 , < 63ae78336f40bcd9a44952a7c6bafb9c88a8effd (git)
Affected: dc2251bf98c66db3f4e055b751968f0871037ae4 , < a0724e40a58a0e323c59707edeae5b71d15800dc (git)
Affected: dc2251bf98c66db3f4e055b751968f0871037ae4 , < e5c9ffc6ae1bcdb1062527d611043681ac301aca (git)
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Linux Linux Affected: 4.14
Unaffected: 0 , < 4.14 (semver)
Unaffected: 5.10.252 , ≤ 5.10.* (semver)
Unaffected: 5.15.202 , ≤ 5.15.* (semver)
Unaffected: 6.1.165 , ≤ 6.1.* (semver)
Unaffected: 6.6.128 , ≤ 6.6.* (semver)
Unaffected: 6.12.75 , ≤ 6.12.* (semver)
Unaffected: 6.18.14 , ≤ 6.18.* (semver)
Unaffected: 6.19.4 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
            "drivers/cpuidle/cpuidle.c"
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          "value": "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-27T12:18:27.247Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "datePublished": "2026-05-27T12:18:27.247Z",
    "dateReserved": "2026-05-13T15:03:33.089Z",
    "dateUpdated": "2026-05-27T12:18:27.247Z",
    "state": "PUBLISHED"
  },
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      "date": "2026-05-29",
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  }
}


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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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