{"id":"CVE-2026-45968","title":"cpuidle: Skip governor when only one idle state is available","summary":"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 idl…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= dc2251bf98c66db3f4e055b751968f0871037ae4 < a0f7e804edc82e513d1ccb7c95ed8b351522ec81","Linux >= dc2251bf98c66db3f4e055b751968f0871037ae4 < 5d103a38e2ae96eca57fd17161bcd29bd4622d1c","Linux >= dc2251bf98c66db3f4e055b751968f0871037ae4 < 4da2b897283c39980d6ae09dc1560fcd937879e5","Linux >= dc2251bf98c66db3f4e055b751968f0871037ae4 < 5c577ac939bca486cb02069505cfe47a5312ce02","Linux >= dc2251bf98c66db3f4e055b751968f0871037ae4 < 8f6833d919bae915ead6c599a53e81e19b32da52","Linux >= dc2251bf98c66db3f4e055b751968f0871037ae4 < 63ae78336f40bcd9a44952a7c6bafb9c88a8effd","Linux >= dc2251bf98c66db3f4e055b751968f0871037ae4 < a0724e40a58a0e323c59707edeae5b71d15800dc","Linux >= dc2251bf98c66db3f4e055b751968f0871037ae4 < e5c9ffc6ae1bcdb1062527d611043681ac301aca","Linux 4.14"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-06T16:03:23.657004Z"},"published":"2026-05-27","updated":"2026-11-06","sourceUpdated":"2026-11-06T16:13:28.911Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-45968","references":[{"url":"https://git.kernel.org/stable/c/a0f7e804edc82e513d1ccb7c95ed8b351522ec81"},{"url":"https://git.kernel.org/stable/c/5d103a38e2ae96eca57fd17161bcd29bd4622d1c"},{"url":"https://git.kernel.org/stable/c/4da2b897283c39980d6ae09dc1560fcd937879e5"},{"url":"https://git.kernel.org/stable/c/5c577ac939bca486cb02069505cfe47a5312ce02"},{"url":"https://git.kernel.org/stable/c/8f6833d919bae915ead6c599a53e81e19b32da52"},{"url":"https://git.kernel.org/stable/c/63ae78336f40bcd9a44952a7c6bafb9c88a8effd"},{"url":"https://git.kernel.org/stable/c/a0724e40a58a0e323c59707edeae5b71d15800dc"},{"url":"https://git.kernel.org/stable/c/e5c9ffc6ae1bcdb1062527d611043681ac301aca"}],"tags":["cve.org"],"epss":0.0013,"epssPercentile":0.02675,"ingestedAt":"2026-11-06T16:57:43.358Z","slug":"CVE-2026-45968","body":"## Overview\n\nIn 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 <= 1, bypassing the governor and keeping the\ntick running.\n\n## Affected\n\n- `Linux >= dc2251bf98c66db3f4e055b751968f0871037ae4 < a0f7e804edc82e513d1ccb7c95ed8b351522ec81`\n- `Linux >= dc2251bf98c66db3f4e055b751968f0871037ae4 < 5d103a38e2ae96eca57fd17161bcd29bd4622d1c`\n- `Linux >= dc2251bf98c66db3f4e055b751968f0871037ae4 < 4da2b897283c39980d6ae09dc1560fcd937879e5`\n- `Linux >= dc2251bf98c66db3f4e055b751968f0871037ae4 < 5c577ac939bca486cb02069505cfe47a5312ce02`\n- `Linux >= dc2251bf98c66db3f4e055b751968f0871037ae4 < 8f6833d919bae915ead6c599a53e81e19b32da52`\n- `Linux >= dc2251bf98c66db3f4e055b751968f0871037ae4 < 63ae78336f40bcd9a44952a7c6bafb9c88a8effd`\n- `Linux >= dc2251bf98c66db3f4e055b751968f0871037ae4 < a0724e40a58a0e323c59707edeae5b71d15800dc`\n- `Linux >= dc2251bf98c66db3f4e055b751968f0871037ae4 < e5c9ffc6ae1bcdb1062527d611043681ac301aca`\n- `Linux 4.14`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}