CVE-2026-45968
published 2026-05-27CVE-2026-45968: In the Linux kernel, the following vulnerability has been resolved: cpuidle: Skip governor when only one idle state is available On certain platforms (PowerNV…
medium5.5
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.
Affected
10 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| linux | linux | — | — |
| linux | linux | >= dc2251bf98c66db3f4e055b751968f0871037ae4 < a0f7e804edc82e513d1ccb7c95ed8b351522ec81 | a0f7e804edc82e513d1ccb7c95ed8b351522ec81 |
| linux | linux | >= dc2251bf98c66db3f4e055b751968f0871037ae4 < 5d103a38e2ae96eca57fd17161bcd29bd4622d1c | 5d103a38e2ae96eca57fd17161bcd29bd4622d1c |
| linux | linux | >= dc2251bf98c66db3f4e055b751968f0871037ae4 < 4da2b897283c39980d6ae09dc1560fcd937879e5 | 4da2b897283c39980d6ae09dc1560fcd937879e5 |
| linux | linux | >= dc2251bf98c66db3f4e055b751968f0871037ae4 < 5c577ac939bca486cb02069505cfe47a5312ce02 | 5c577ac939bca486cb02069505cfe47a5312ce02 |
| linux | linux | >= dc2251bf98c66db3f4e055b751968f0871037ae4 < 8f6833d919bae915ead6c599a53e81e19b32da52 | 8f6833d919bae915ead6c599a53e81e19b32da52 |
| linux | linux | >= dc2251bf98c66db3f4e055b751968f0871037ae4 < 63ae78336f40bcd9a44952a7c6bafb9c88a8effd | 63ae78336f40bcd9a44952a7c6bafb9c88a8effd |
| linux | linux | >= dc2251bf98c66db3f4e055b751968f0871037ae4 < a0724e40a58a0e323c59707edeae5b71d15800dc | a0724e40a58a0e323c59707edeae5b71d15800dc |
| linux | linux | >= dc2251bf98c66db3f4e055b751968f0871037ae4 < e5c9ffc6ae1bcdb1062527d611043681ac301aca | e5c9ffc6ae1bcdb1062527d611043681ac301aca |
| linux | linux_kernel | — | — |