In the Linux kernel, the following vulnerability has been resolved:
powerpc/perf: fix preempt count underflow in fsl_emb_pmu_del
fsl_emb_pmu_del() unconditionally calls put_cpu_var(cpu_hw_events) at the 'out:' label, but only calls the matching get_cpu_var() after the 'i < 0' early-return check. When event->hw.idx is negative the function jumps to 'out:' without having taken get_cpu_var(), and the trailing put_cpu_var() then issues an unmatched preempt_enable(), underflowing preempt_count.
On a CONFIG_PREEMPT=y kernel preempt_count would underflow and eventually present as a 'scheduling while atomic' BUG.
Move put_cpu_var() to pair with get_cpu_var() so the percpu access is correctly bracketed and the 'out:' label only handles perf_pmu_enable.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Aug 30, 2026 | Aug 30, 2026 |
| Ubuntu | — | Upgrade linux-image-gcp-7.0Upgrade linux-image-lowlatency-64k-5.15Upgrade linux-image-5.15.0-198-generic-64kUpgrade linux-image-oracle-64kUpgrade linux-image-intelUpgrade linux-image-oracle-64k-7.0Upgrade linux-image-oracle-7.0Upgrade linux-image-5.15.0-1123-azureUpgrade linux-image-azure-fde-7.0Upgrade linux-image-gkeUpgrade linux-image-oem-20.04Upgrade linux-image-realtime-64k-7.0Upgrade linux-image-azure-7.0Upgrade linux-image-gke-5.15Upgrade linux-image-generic-lpaeUpgrade linux-image-awsUpgrade linux-image-aws-5.15Upgrade linux-image-virtual-7.0Upgrade linux-image-aws-64k-lts-22.04Upgrade linux-image-gke-hwe-26.04Upgrade linux-image-lowlatency-64kUpgrade linux-image-oracle-lts-22.04Upgrade linux-image-azure-fde-lts-26.04Upgrade linux-image-ibmUpgrade linux-image-kvmUpgrade linux-image-generic-64k-7.0Upgrade linux-image-5.15.0-1100-gkeopUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-fips-5.15Upgrade linux-image-oracleUpgrade linux-image-virtualUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-5.15.0-1118-gcp-fipsUpgrade linux-image-xilinx-zynqmp-5.15Upgrade linux-image-realtime-64k-hwe-26.04Upgrade linux-image-realtime-hwe-26.04Upgrade linux-image-5.15.0-1109-intel-iot-realtimeUpgrade linux-image-gcpUpgrade linux-image-5.15.0-1114-oracleUpgrade linux-image-7.0.0-1015-ibmUpgrade linux-image-5.15.0-1109-kvmUpgrade linux-image-fipsUpgrade linux-image-gcp-lts-22.04Upgrade linux-image-intel-iot-realtimeUpgrade linux-image-realtimeUpgrade linux-image-azure-cvmUpgrade linux-image-intel-iot-realtime-5.15Upgrade linux-image-7.0.0-1008-gke-64kUpgrade linux-image-7.0.0-38-generic-64kUpgrade linux-image-azure-lts-26.04Upgrade linux-image-nvidiaUpgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-generic-64k-hwe-20.04Upgrade linux-image-7.0.0-38-genericUpgrade linux-image-gke-64k-hwe-26.04Upgrade linux-image-7.0.0-1014-aws-64kUpgrade linux-image-lowlatencyUpgrade linux-image-oem-20.04dUpgrade linux-image-7.0.0-1013-oracleUpgrade linux-image-lowlatency-hwe-20.04Upgrade linux-image-7.0.0-1017-azureUpgrade linux-image-5.15.0-1080-xilinx-zynqmpUpgrade linux-image-5.15.0-1112-nvidia-lowlatencyUpgrade linux-image-intel-iotgUpgrade linux-image-5.15.0-1117-aws-64kUpgrade linux-image-5.15.0-195-lowlatency-64kUpgrade linux-image-gcp-5.15Upgrade linux-image-aws-64kUpgrade linux-image-5.15.0-198-genericUpgrade linux-image-aws-lts-22.04Upgrade linux-image-oem-20.04bUpgrade linux-image-azure-fips-5.15Upgrade linux-image-5.15.0-1111-ibmUpgrade linux-image-nvidia-lowlatency-5.15Upgrade linux-image-nvidia-lowlatencyUpgrade linux-image-virtual-hwe-20.04Upgrade linux-image-7.0.0-1015-oemUpgrade linux-image-5.15.0-1123-azure-fipsUpgrade linux-image-7.0.0-1013-oracle-64kUpgrade linux-image-gke-64k-7.0Upgrade linux-image-5.15.0-1117-awsUpgrade linux-image-oem-20.04cUpgrade linux-image-realtime-5.15Upgrade linux-image-oracle-5.15Upgrade linux-image-generic-lpae-hwe-20.04Upgrade linux-image-generic-hwe-20.04Upgrade linux-image-7.0.0-1008-gkeUpgrade linux-image-gkeopUpgrade linux-image-gke-7.0Upgrade linux-image-gke-64kUpgrade linux-image-generic-64k-hwe-26.04Upgrade linux-image-generic-64k-5.15Upgrade linux-image-gcp-fipsUpgrade linux-image-7.0.0-38-realtimeUpgrade linux-image-gcp-64kUpgrade linux-image-aws-64k-5.15Upgrade linux-image-oem-7.0Upgrade linux-image-gkeop-5.15Upgrade linux-image-generic-lpae-5.15Upgrade linux-image-genericUpgrade linux-image-gcp-64k-7.0Upgrade linux-image-7.0.0-1014-awsUpgrade linux-image-5.15.0-1116-realtimeUpgrade linux-image-5.15.0-1112-nvidiaUpgrade linux-image-realtime-7.0Upgrade linux-image-virtual-hwe-26.04Upgrade linux-image-5.15.0-198-fipsUpgrade linux-image-lowlatency-64k-hwe-20.04Upgrade linux-image-generic-5.15Upgrade linux-image-azureUpgrade linux-image-7.0.0-38-realtime-64kUpgrade linux-image-xilinx-zynqmpUpgrade linux-image-realtime-64kUpgrade linux-image-5.15.0-198-generic-lpaeUpgrade linux-image-generic-7.0Upgrade linux-image-7.0.0-1014-gcp-64kUpgrade linux-image-7.0.0-1014-gcpUpgrade linux-image-5.15.0-1113-gkeUpgrade linux-image-virtual-5.15Upgrade linux-image-ibm-5.15Upgrade linux-image-azure-lts-22.04Upgrade linux-image-azure-fdeUpgrade linux-image-5.15.0-1117-aws-fipsUpgrade linux-image-aws-fips-5.15Upgrade linux-image-azure-fde-5.15Upgrade linux-image-5.15.0-1112-intel-iotgUpgrade linux-image-5.15.0-1122-azure-fdeUpgrade linux-image-nvidia-5.15Upgrade linux-image-intel-iotg-5.15Upgrade linux-image-gcp-fips-5.15Upgrade linux-image-aws-fipsUpgrade linux-image-aws-64k-7.0Upgrade linux-image-5.15.0-195-lowlatencyUpgrade linux-image-azure-fipsUpgrade linux-image-oem-26.04aUpgrade linux-image-oem-26.04Upgrade linux-image-lowlatency-5.15Upgrade linux-image-generic-hwe-26.04Upgrade linux-image-generic-64kUpgrade linux-image-ibm-7.0Upgrade linux-image-azure-5.15Upgrade linux-image-aws-7.0Upgrade linux-image-7.0.0-1016-azure-fdeUpgrade linux-image-5.15.0-1118-gcpUpgrade linux-image-kvm-5.15 | Oct 6, 2026 | Oct 6, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Sep 15, 2026 | Aug 28, 2026 |
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