{"id":"CVE-2026-45968","state":"PUBLISHED","title":"cpuidle: Skip governor when only one idle state is available","description":"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 <= 1, bypassing the governor and keeping the\ntick running.","publishedAt":"2026-05-27T12:18:27.247Z","updatedAt":"2026-05-27T12:18:27.247Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"dc2251bf98c66db3f4e055b751968f0871037ae4","status":"affected","lessThan":"a0f7e804edc82e513d1ccb7c95ed8b351522ec81","versionType":"git"},{"version":"dc2251bf98c66db3f4e055b751968f0871037ae4","status":"affected","lessThan":"5d103a38e2ae96eca57fd17161bcd29bd4622d1c","versionType":"git"},{"version":"dc2251bf98c66db3f4e055b751968f0871037ae4","status":"affected","lessThan":"4da2b897283c39980d6ae09dc1560fcd937879e5","versionType":"git"},{"version":"dc2251bf98c66db3f4e055b751968f0871037ae4","status":"affected","lessThan":"5c577ac939bca486cb02069505cfe47a5312ce02","versionType":"git"},{"version":"dc2251bf98c66db3f4e055b751968f0871037ae4","status":"affected","lessThan":"8f6833d919bae915ead6c599a53e81e19b32da52","versionType":"git"},{"version":"dc2251bf98c66db3f4e055b751968f0871037ae4","status":"affected","lessThan":"63ae78336f40bcd9a44952a7c6bafb9c88a8effd","versionType":"git"},{"version":"dc2251bf98c66db3f4e055b751968f0871037ae4","status":"affected","lessThan":"a0724e40a58a0e323c59707edeae5b71d15800dc","versionType":"git"},{"version":"dc2251bf98c66db3f4e055b751968f0871037ae4","status":"affected","lessThan":"e5c9ffc6ae1bcdb1062527d611043681ac301aca","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/cpuidle/cpuidle.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.14","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.14","versionType":"semver"},{"version":"5.10.252","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.202","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.165","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.128","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.75","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.14","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.4","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/cpuidle/cpuidle.c"]}],"references":["https://git.kernel.org/stable/c/a0f7e804edc82e513d1ccb7c95ed8b351522ec81","https://git.kernel.org/stable/c/5d103a38e2ae96eca57fd17161bcd29bd4622d1c","https://git.kernel.org/stable/c/4da2b897283c39980d6ae09dc1560fcd937879e5","https://git.kernel.org/stable/c/5c577ac939bca486cb02069505cfe47a5312ce02","https://git.kernel.org/stable/c/8f6833d919bae915ead6c599a53e81e19b32da52","https://git.kernel.org/stable/c/63ae78336f40bcd9a44952a7c6bafb9c88a8effd","https://git.kernel.org/stable/c/a0724e40a58a0e323c59707edeae5b71d15800dc","https://git.kernel.org/stable/c/e5c9ffc6ae1bcdb1062527d611043681ac301aca"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:07.131Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/45xxx/CVE-2026-45968.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-45968","state":"PUBLISHED","datePublished":"2026-05-27T12:18:27.247Z","dateUpdated":"2026-05-27T12:18:27.247Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-05-13T15:03:33.089Z"},"containers":{"cna":{"title":"cpuidle: Skip governor when only one idle state is available","descriptions":[{"lang":"en","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 <= 1, bypassing the governor and keeping the\ntick running."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"dc2251bf98c66db3f4e055b751968f0871037ae4","status":"affected","lessThan":"a0f7e804edc82e513d1ccb7c95ed8b351522ec81","versionType":"git"},{"version":"dc2251bf98c66db3f4e055b751968f0871037ae4","status":"affected","lessThan":"5d103a38e2ae96eca57fd17161bcd29bd4622d1c","versionType":"git"},{"version":"dc2251bf98c66db3f4e055b751968f0871037ae4","status":"affected","lessThan":"4da2b897283c39980d6ae09dc1560fcd937879e5","versionType":"git"},{"version":"dc2251bf98c66db3f4e055b751968f0871037ae4","status":"affected","lessThan":"5c577ac939bca486cb02069505cfe47a5312ce02","versionType":"git"},{"version":"dc2251bf98c66db3f4e055b751968f0871037ae4","status":"affected","lessThan":"8f6833d919bae915ead6c599a53e81e19b32da52","versionType":"git"},{"version":"dc2251bf98c66db3f4e055b751968f0871037ae4","status":"affected","lessThan":"63ae78336f40bcd9a44952a7c6bafb9c88a8effd","versionType":"git"},{"version":"dc2251bf98c66db3f4e055b751968f0871037ae4","status":"affected","lessThan":"a0724e40a58a0e323c59707edeae5b71d15800dc","versionType":"git"},{"version":"dc2251bf98c66db3f4e055b751968f0871037ae4","status":"affected","lessThan":"e5c9ffc6ae1bcdb1062527d611043681ac301aca","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/cpuidle/cpuidle.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.14","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.14","versionType":"semver"},{"version":"5.10.252","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.202","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.165","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.128","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.75","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.14","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.4","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/cpuidle/cpuidle.c"]}],"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"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-27T12:18:27.247Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14","versionEndExcluding":"5.10.252"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14","versionEndExcluding":"5.15.202"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14","versionEndExcluding":"6.1.165"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14","versionEndExcluding":"6.6.128"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14","versionEndExcluding":"6.12.75"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14","versionEndExcluding":"6.18.14"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14","versionEndExcluding":"6.19.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14","versionEndExcluding":"7.0"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}