In the Linux kernel, the following vulnerability has been resolved:
PCI: dwc: ep: Prevent changing BAR size/flags in pci_epc_set_bar()
In commit 4284c88fff0e ("PCI: designware-ep: Allow pci_epc_set_bar() update inbound map address") set_bar() was modified to support dynamically changing the backing physical address of a BAR that was already configured.
This means that set_bar() can be called twice, without ever calling clear_bar() (as calling clear_bar() would clear the BAR's PCI address assigned by the host).
This can only be done if the new BAR size/flags does not differ from the existing BAR configuration. Add these missing checks.
If we allow set_bar() to set e.g. a new BAR size that differs from the existing BAR size, the new address translation range will be smaller than the BAR size already determined by the host, which would mean that a read past the new BAR size would pass the iATU untranslated, which could allow the host to read memory not belonging to the new struct pci_epf_bar.
While at it, add comments which clarifies the support for dynamically changing the physical address of a BAR. (Which was also missing.)
CVSS Details
- CVSS 3.1 Base Score: 9.6
- CVSS 3.1 Vector: (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | May 15, 2025 | Feb 27, 2025 |
| Oracle_linux | — | Upgrade kernel | Dec 3, 2025 | Feb 27, 2025 |
| Redhat_linux | — | Upgrade kernelUpgrade kernel-rt | Jan 27, 2026 | Feb 27, 2025 |
| Rocky_linux | — | Upgrade python3-perf-debuginfoUpgrade kernel-rt-develUpgrade kernel-rt-debug-modulesUpgrade kernel-toolsUpgrade kernel-debug-uki-virtUpgrade kernel-debug-coreUpgrade kernel-uki-virtUpgrade python3-perfUpgrade kernel-rt-debuginfoUpgrade kernel-rtUpgrade kernel-modules-extraUpgrade kernel-debuginfo-common-s390xUpgrade kernel-rt-debug-debuginfoUpgrade kernel-rt-debug-coreUpgrade kernel-rt-debug-modules-extraUpgrade kernel-develUpgrade kernel-rt-debug-modules-coreUpgrade kernel-uki-virt-addonsUpgrade kernel-tools-debuginfoUpgrade kernel-zfcpdumpUpgrade kernel-zfcpdump-devel-matchedUpgrade perfUpgrade kernel-tools-libsUpgrade rvUpgrade kernel-rt-coreUpgrade kernel-rt-debugUpgrade kernel-rt-modulesUpgrade kernel-debug-modules-extraUpgrade rtlaUpgrade kernel-tools-libs-develUpgrade libperfUpgrade kernel-modulesUpgrade kernel-rt-modules-extraUpgrade kernel-debuginfoUpgrade kernel-debug-debuginfoUpgrade kernel-devel-matchedUpgrade kernel-modules-extra-matchedUpgrade kernel-debug-develUpgrade kernel-zfcpdump-develUpgrade kernel-rt-modules-coreUpgrade kernel-debug-modules-coreUpgrade kernel-zfcpdump-coreUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-zfcpdump-modulesUpgrade kernel-debug-devel-matchedUpgrade kernel-coreUpgrade kernel-rt-debug-develUpgrade kernel-debug-modulesUpgrade kernel-zfcpdump-debuginfoUpgrade kernel-zfcpdump-modules-coreUpgrade kernel-zfcpdump-modules-extraUpgrade kernelUpgrade kernel-modules-coreUpgrade libperf-debuginfoUpgrade kernel-debugUpgrade perf-debuginfo | Feb 5, 2026 | Nov 27, 2025 |
| Ubuntu | — | Upgrade linux-image-generic-64k-hwe-22.04Upgrade linux-image-6.11.0-1014-lowlatencyUpgrade linux-image-6.8.0-1034-azureUpgrade linux-image-6.8.0-1032-aws-64kUpgrade linux-image-lowlatency-64k-6.8Upgrade linux-image-oem-24.04bUpgrade linux-image-6.8.0-1029-ibmUpgrade linux-image-nvidia-hwe-22.04Upgrade linux-image-6.11.0-1016-oracleUpgrade linux-image-nvidia-lowlatency-64kUpgrade linux-image-realtimeUpgrade linux-image-6.8.0-64-genericUpgrade linux-image-6.11.0-1015-azureUpgrade linux-image-oracleUpgrade linux-image-6.8.0-1032-awsUpgrade linux-image-6.8.0-1031-nvidia-lowlatency-64kUpgrade linux-image-raspi-realtimeUpgrade linux-image-gcp-64k-lts-24.04Upgrade linux-image-lowlatency-64k-hwe-24.04Upgrade linux-image-6.8.0-1028-gkeUpgrade linux-image-6.11.0-26-generic-64kUpgrade linux-image-oem-22.04dUpgrade linux-image-gkeUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-nvidia-64kUpgrade linux-image-6.11.0-1015-gcpUpgrade linux-image-6.8.0-1031-nvidia-64kUpgrade linux-image-virtualUpgrade linux-image-gcpUpgrade linux-image-6.8.0-1029-oracleUpgrade linux-image-6.8.0-1031-nvidiaUpgrade linux-image-azure-6.8Upgrade linux-image-aws-lts-24.04Upgrade linux-image-6.8.0-1029-oracle-64kUpgrade linux-image-azure-fde-6.8Upgrade linux-image-nvidia-64k-6.8Upgrade linux-image-6.11.0-26-genericUpgrade linux-image-6.8.0-64-generic-64kUpgrade linux-image-lowlatency-hwe-22.04Upgrade linux-image-generic-hwe-22.04Upgrade linux-image-oem-24.04Upgrade linux-image-6.8.0-1034-azure-fdeUpgrade linux-image-lowlatency-64k-hwe-22.04Upgrade linux-image-nvidia-lowlatency-64k-6.8Upgrade linux-image-6.11.0-1016-oracle-64kUpgrade linux-image-oracle-64kUpgrade linux-image-nvidia-64k-hwe-22.04Upgrade linux-image-aws-64kUpgrade linux-image-gcp-lts-24.04Upgrade linux-image-6.11.0-1013-raspiUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-gcp-6.8Upgrade linux-image-awsUpgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-gcp-64k-6.8Upgrade linux-image-oem-24.04aUpgrade linux-image-6.11.0-1014-lowlatency-64kUpgrade linux-image-6.8.1-1025-realtimeUpgrade linux-image-azure-nvidia-6.8Upgrade linux-image-raspi-realtime-6.8Upgrade linux-image-lowlatency-6.8Upgrade linux-image-6.8.0-1015-gkeopUpgrade linux-image-oem-22.04aUpgrade linux-image-nvidia-lowlatencyUpgrade linux-image-ibm-classicUpgrade linux-image-azure-fde-lts-24.04Upgrade linux-image-6.8.0-64-lowlatency-64kUpgrade linux-image-raspi-6.8Upgrade linux-image-azure-lts-24.04Upgrade linux-image-nvidia-lowlatency-6.8Upgrade linux-image-6.11.0-1015-azure-fdeUpgrade linux-image-6.8.0-1022-azure-nvidiaUpgrade linux-image-gke-6.8Upgrade linux-image-oracle-6.8Upgrade linux-image-nvidiaUpgrade linux-image-oracle-64k-lts-24.04Upgrade linux-image-kvmUpgrade linux-image-6.11.0-1015-gcp-64kUpgrade linux-image-6.8.0-1031-nvidia-lowlatencyUpgrade linux-image-azureUpgrade linux-image-6.8.0-1031-oemUpgrade linux-image-gkeop-6.8Upgrade linux-image-oem-22.04Upgrade linux-image-oem-6.8Upgrade linux-image-nvidia-6.8Upgrade linux-image-aws-64k-6.8Upgrade linux-image-6.11.0-1022-oemUpgrade linux-image-virtual-hwe-22.04Upgrade linux-image-6.8.0-64-lowlatencyUpgrade linux-image-aws-6.8Upgrade linux-image-oracle-64k-6.8Upgrade linux-image-6.8.0-1033-gcp-64kUpgrade linux-image-generic-lpaeUpgrade linux-image-generic-6.8Upgrade linux-image-azure-nvidia-lts-24.04Upgrade linux-image-6.8.0-2026-raspi-realtimeUpgrade linux-image-ibmUpgrade linux-image-genericUpgrade linux-image-lowlatencyUpgrade linux-image-virtual-6.8Upgrade linux-image-oem-22.04cUpgrade linux-image-gcp-64kUpgrade linux-image-6.11.0-1014-awsUpgrade linux-image-lowlatency-hwe-24.04Upgrade linux-image-oracle-lts-24.04Upgrade linux-image-realtime-6.8.1Upgrade linux-image-raspiUpgrade linux-image-lowlatency-64kUpgrade linux-image-generic-64k-6.8Upgrade linux-image-6.11.0-1010-realtimeUpgrade linux-image-6.8.0-1033-gcpUpgrade linux-image-azure-nvidiaUpgrade linux-image-ibm-6.8Upgrade linux-image-generic-64kUpgrade linux-image-azure-fdeUpgrade linux-image-aws-64k-lts-24.04Upgrade linux-image-6.8.0-1031-raspiUpgrade linux-image-oem-22.04bUpgrade linux-image-ibm-lts-24.04Upgrade linux-image-gkeop | May 21, 2025 | Feb 27, 2025 |
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