cpuidle: Skip governor when only one idle state is available
Summary
| CVE | CVE-2026-45968 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-05-27 14:17:13 UTC |
| Updated | 2026-05-27 14:48:03 UTC |
| Description | 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. |
Risk And Classification
EPSS: 0.000240000 probability, percentile 0.073930000 (date 2026-05-29)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected dc2251bf98c66db3f4e055b751968f0871037ae4 a0f7e804edc82e513d1ccb7c95ed8b351522ec81 git | Not specified |
| CNA | Linux | Linux | affected dc2251bf98c66db3f4e055b751968f0871037ae4 5d103a38e2ae96eca57fd17161bcd29bd4622d1c git | Not specified |
| CNA | Linux | Linux | affected dc2251bf98c66db3f4e055b751968f0871037ae4 4da2b897283c39980d6ae09dc1560fcd937879e5 git | Not specified |
| CNA | Linux | Linux | affected dc2251bf98c66db3f4e055b751968f0871037ae4 5c577ac939bca486cb02069505cfe47a5312ce02 git | Not specified |
| CNA | Linux | Linux | affected dc2251bf98c66db3f4e055b751968f0871037ae4 8f6833d919bae915ead6c599a53e81e19b32da52 git | Not specified |
| CNA | Linux | Linux | affected dc2251bf98c66db3f4e055b751968f0871037ae4 63ae78336f40bcd9a44952a7c6bafb9c88a8effd git | Not specified |
| CNA | Linux | Linux | affected dc2251bf98c66db3f4e055b751968f0871037ae4 a0724e40a58a0e323c59707edeae5b71d15800dc git | Not specified |
| CNA | Linux | Linux | affected dc2251bf98c66db3f4e055b751968f0871037ae4 e5c9ffc6ae1bcdb1062527d611043681ac301aca git | Not specified |
| CNA | Linux | Linux | affected 4.14 | Not specified |
| CNA | Linux | Linux | unaffected 4.14 semver | Not specified |
| CNA | Linux | Linux | unaffected 5.10.252 5.10.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.15.202 5.15.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.165 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.128 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.75 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.14 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.19.4 6.19.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.0 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/8f6833d919bae915ead6c599a53e81e19b32da52 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/5d103a38e2ae96eca57fd17161bcd29bd4622d1c | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/63ae78336f40bcd9a44952a7c6bafb9c88a8effd | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/5c577ac939bca486cb02069505cfe47a5312ce02 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/a0724e40a58a0e323c59707edeae5b71d15800dc | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/e5c9ffc6ae1bcdb1062527d611043681ac301aca | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/4da2b897283c39980d6ae09dc1560fcd937879e5 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/a0f7e804edc82e513d1ccb7c95ed8b351522ec81 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.