In the Linux kernel, the following vulnerability has been resolved:
ACPI: CPPC: Suppress UBSAN warning caused by field misuse
The definition of reg->access_width changes depending on the reg->space_id type. Type ACPI_ADR_SPACE_PLATFORM_COMM uses access_width to indicate the PCC region, which can result in a UBSAN if the value is greater than 4.
For example:
UBSAN: shift-out-of-bounds in drivers/acpi/cppc_acpi.c:1090:9 shift exponent 32 is too large for 32-bit type 'int' CPU: 61 UID: 0 PID: 1220 Comm: (udev-worker) Not tainted 7.0.10-201.fc44.aarch64 #1 PREEMPT(lazy) Hardware name: To be filled by O.E.M. Call trace: ...(trimming) ubsan_epilogue+0x10/0x48 __ubsan_handle_shift_out_of_bounds+0xdc/0x1e0 cpc_write+0x4d0/0x670 cppc_set_perf+0x18c/0x490 cppc_cpufreq_cpu_init+0x1c8/0x380 [cppc_cpufreq] ... (trimming)
Lets fix this by validating the region type, as well as whether access_width has a value. Then since we are returning bit_width directly for ACPI_ADR_SPACE_PLATFORM_COMM, drop the code correcting the size.
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade kernel-debuginfoUpgrade kernel-toolsUpgrade kernel6.12-debuginfo-common-aarch64Upgrade bpftool-debuginfoUpgrade kernel6.12-headersUpgrade kernel6.18-modules-extra-commonUpgrade kernel6.12Upgrade kernel-livepatch-6.12.100-125.179Upgrade kernel-livepatch-6.18.39-79.141Upgrade kernel-debuginfo-common-x86_64Upgrade kernel6.18-debuginfo-common-aarch64Upgrade python3-perf6.18-debuginfoUpgrade kernel6.12-modules-extra-commonUpgrade bpftool6.18Upgrade kernel6.12-modules-extraUpgrade bpftoolUpgrade perf-debuginfoUpgrade kernel6.12-debuginfo-common-x86_64Upgrade kernel-headersUpgrade kernel-tools-debuginfoUpgrade perf6.18-debuginfoUpgrade python3-perf6.18Upgrade kernel-modules-extraUpgrade perf6.12Upgrade kernel6.12-develUpgrade kernel6.18Upgrade kernel6.18-tools-debuginfoUpgrade perf6.18Upgrade python3-perf-debuginfoUpgrade bpftool6.12-debuginfoUpgrade kernel6.12-tools-debuginfoUpgrade perfUpgrade bpftool6.12Upgrade perf6.12-debuginfoUpgrade kernel6.12-tools-develUpgrade python3-perfUpgrade kernel-livepatch-6.1.180-225.360Upgrade python3-perf6.12-debuginfoUpgrade kernel6.18-develUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-tools-develUpgrade kernel6.18-tools-develUpgrade kernel6.12-toolsUpgrade kernel-develUpgrade kernelUpgrade kernel6.18-toolsUpgrade python3-perf6.12Upgrade microvm-kernel6.18Upgrade kernel6.18-headersUpgrade kernel6.18-debuginfo-common-x86_64Upgrade kernel-modules-extra-commonUpgrade bpftool6.18-debuginfoUpgrade kernel6.18-modules-extraUpgrade kernel6.12-debuginfoUpgrade kernel6.18-debuginfo | Aug 18, 2026 | Jul 25, 2026 |
| Debian | — | Upgrade linux-6.1Upgrade linux-6.12Upgrade linux | Jul 28, 2026 | Jul 28, 2026 |
| Redhat_linux | — | No solution exists | Jul 29, 2026 | Jul 25, 2026 |
| Ubuntu | — | Upgrade linux-image-oracle-64k-7.0Upgrade linux-image-oem-26.04bUpgrade linux-image-aws-64kUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-oracleUpgrade linux-image-7.0.0-31-generic-64kUpgrade linux-image-awsUpgrade linux-image-7.0.0-1013-ibmUpgrade linux-image-7.0.0-31-realtime-64kUpgrade linux-image-virtualUpgrade linux-image-7.0.0-1013-oemUpgrade linux-image-gcpUpgrade linux-image-generic-64k-7.0Upgrade linux-image-gke-64k-hwe-26.04Upgrade linux-image-7.0.0-1011-oracleUpgrade linux-image-7.0.0-1006-gke-64kUpgrade linux-image-7.0.0-1011-gcpUpgrade linux-image-gcp-7.0Upgrade linux-image-7.0.0-31-genericUpgrade linux-image-7.0.0-1014-azureUpgrade linux-image-gkeUpgrade linux-image-raspi-realtimeUpgrade linux-image-realtime-hwe-26.04Upgrade linux-image-azure-lts-26.04Upgrade linux-image-realtimeUpgrade linux-image-virtual-7.0Upgrade linux-image-realtime-64k-7.0Upgrade linux-image-7.0.0-1006-gkeUpgrade linux-image-oracle-64kUpgrade linux-image-7.0.0-1019-raspi-realtimeUpgrade linux-image-raspi-7.0Upgrade linux-image-gke-hwe-26.04Upgrade linux-image-7.0.0-1011-oracle-64kUpgrade linux-image-realtime-64kUpgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-7.0.0-1018-nvidiaUpgrade linux-image-azureUpgrade linux-image-gcp-64k-7.0Upgrade linux-image-virtual-hwe-26.04Upgrade linux-image-7.0.0-2018-nvidia-bos-64kUpgrade linux-image-gke-64kUpgrade linux-image-gke-64k-7.0Upgrade linux-image-7.0.0-31-realtimeUpgrade linux-image-aws-64k-7.0Upgrade linux-image-7.0.0-1019-raspiUpgrade linux-image-7.0.0-1018-nvidia-64kUpgrade linux-image-7.0.0-1012-awsUpgrade linux-image-nvidia-bos-64k-7.0Upgrade linux-image-generic-7.0Upgrade linux-image-genericUpgrade linux-image-oracle-7.0Upgrade linux-image-nvidia-7.0Upgrade linux-image-nvidia-64k-7.0Upgrade linux-image-generic-hwe-24.04Upgrade linux-image-7.0.0-1011-gcp-64kUpgrade linux-image-ibmUpgrade linux-image-generic-64k-hwe-26.04Upgrade linux-image-nvidia-bos-7.0Upgrade linux-image-nvidia-64k-hwe-26.04Upgrade linux-image-raspi-realtime-7.0Upgrade linux-image-nvidiaUpgrade linux-image-realtime-64k-hwe-26.04Upgrade linux-image-oem-26.04aUpgrade linux-image-oem-7.0Upgrade linux-image-generic-64kUpgrade linux-image-oem-26.04Upgrade linux-image-realtime-7.0Upgrade linux-image-azure-7.0Upgrade linux-image-ibm-7.0Upgrade linux-image-7.0.0-2018-nvidia-bosUpgrade linux-image-gcp-64kUpgrade linux-image-aws-7.0Upgrade linux-image-nvidia-hwe-26.04Upgrade linux-image-gke-7.0Upgrade linux-image-raspiUpgrade linux-image-nvidia-bos-64kUpgrade linux-image-nvidia-bosUpgrade linux-image-nvidia-64kUpgrade linux-image-generic-hwe-26.04Upgrade linux-image-7.0.0-1012-aws-64k | Sep 14, 2026 | Sep 7, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Jul 31, 2026 | Jul 25, 2026 |
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