In the Linux kernel, the following vulnerability has been resolved:
regulator: core: fix use_count leakage when handling boot-on
I found a use_count leakage towards supply regulator of rdev with boot-on option.
┌───────────────────┐ ┌───────────────────┐ │ regulator_dev A │ │ regulator_dev B │ │ (boot-on) │ │ (boot-on) │ │ use_count=0 │◀──supply──│ use_count=1 │ │ │ │ │ └───────────────────┘ └───────────────────┘
In case of rdev(A) configured with `regulator-boot-on', the use_count of supplying regulator(B) will increment inside regulator_enable(rdev->supply).
Thus, B will acts like always-on, and further balanced regulator_enable/disable cannot actually disable it anymore.
However, B was also configured with `regulator-boot-on', we wish it could be disabled afterwards.
CVSS Details
- CVSS 3.1 Base Score: 5.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade kernel-tools-debuginfoUpgrade kernel-headersUpgrade kernel-toolsUpgrade bpftool-debuginfoUpgrade bpftoolUpgrade python-perf-debuginfoUpgrade python-perfUpgrade kernel-debuginfo-common-x86_64Upgrade kernelUpgrade kernel-develUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-tools-develUpgrade perfUpgrade kernel-livepatch-5.10.165-143.735Upgrade perf-debuginfoUpgrade kernel-debuginfo | May 20, 2026 | May 20, 2026 |
| Debian | — | Upgrade linux | Sep 17, 2025 | Sep 17, 2025 |
| Huawei Euleros 2_0_sp13 | — | Upgrade bpftoolUpgrade kernelUpgrade kernel-tools-libsUpgrade python3-perfUpgrade kernel-toolsUpgrade kernel-abi-stablelists | Feb 3, 2026 | Feb 2, 2026 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Sep 15, 2025 |
| Ubuntu | — | Upgrade linux-lowlatency-hwe-5.15Upgrade linux-oracleUpgrade linux-realtimeUpgrade linux-aws-fipsUpgrade linux-kvmUpgrade linux-raspi-5.4Upgrade linux-aws-5.15Upgrade linux-gcp-5.15Upgrade linux-hwe-5.4Upgrade linux-intel-iotgUpgrade linux-ibmUpgrade linux-xilinx-zynqmpUpgrade linux-oracle-5.15Upgrade linux-bluefieldUpgrade linux-intel-iot-realtimeUpgrade linux-oracle-5.4Upgrade linux-gcpUpgrade linux-intel-iotg-5.15Upgrade linux-riscv-5.15Upgrade linux-azure-5.15Upgrade linux-gkeUpgrade linux-fipsUpgrade linux-nvidiaUpgrade linux-lowlatencyUpgrade linux-gkeopUpgrade linux-azure-fde-5.15Upgrade linux-azure-fipsUpgrade linux-gcp-fipsUpgrade linux-aws-5.4Upgrade linux-iotUpgrade linux-nvidia-tegra-5.15Upgrade linux-ibm-5.4Upgrade linux-azureUpgrade linux-raspiUpgrade linuxUpgrade linux-gcp-5.4Upgrade linux-azure-5.4Upgrade linux-awsUpgrade linux-hwe-5.15 | Sep 19, 2025 | Sep 16, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Oct 15, 2025 | Sep 15, 2025 |
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