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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
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
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)
guessed Create a notification for this product.
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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."
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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-06-28T11:22:57+00:00",
      "cve": "CVE-2026-45968",
      "id": "CVE-2026-45968",
      "initial_release_date": "2026-05-27T00:00:00+00:00",
      "product_status:known_affected": "246",
      "product_status:known_not_affected": "28",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: cpuidle: Skip governor when only one idle state is available",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45968.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T02:05:20Z",
      "cve": "CVE-2026-45968",
      "id": "CVE-2026-45968",
      "initial_release_date": "2026-05-28T03:55:14Z",
      "product_status:first_fixed": "165",
      "product_status:known_affected": "640",
      "product_status:known_not_affected": "125",
      "product_status:recommended": "42",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-45968",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-45968.json",
      "version": "10"
    }
  }
}



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  • 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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • 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.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.