Description
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.)
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Linux | Linux | 6.0 | 6.1.191 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | linux | 6.12.15-1 | — |
| Debian 13 | linux | 6.12.15-1 | — |
| Debian 12 | linux | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | linux | 6.8.0-64.67 | USN-7651-1 |
| Ubuntu 24.04 LTS | linux-aws | 6.8.0-1032.34 | USN-7651-1 |
| Ubuntu 24.04 LTS | linux-azure | 6.8.0-1034.39 | USN-7737-1 |
| Ubuntu 24.04 LTS | linux-azure-nvidia | 6.8.0-1022.23 | USN-7737-1 |
| Ubuntu 24.04 LTS | linux-gcp | 6.8.0-1033.35 | USN-7651-4 |
| Ubuntu 24.04 LTS | linux-gcp-6.11 +1 | 6.11.0-1015.15~24.04.1 | USN-7521-1 |
| Ubuntu 24.04 LTS | linux-gke | 6.8.0-1028.32 | USN-7651-3 |
| Ubuntu 24.04 LTS | linux-gkeop | 6.8.0-1015.17 | USN-7651-3 |
| Ubuntu 24.04 LTS | linux-hwe-6.11 | 6.11.0-26.26~24.04.1 | USN-7521-1 |
| Ubuntu 24.04 LTS | linux-ibm | 6.8.0-1029.29 | USN-7651-2 |
| Ubuntu 24.04 LTS | linux-lowlatency | 6.8.0-64.67.1 | USN-7651-2 |
| Ubuntu 24.04 LTS | linux-lowlatency-hwe-6.11 | 6.11.0-1014.15~24.04.1 | USN-7521-3 |
| Ubuntu 24.04 LTS | linux-nvidia | 6.8.0-1031.34 | USN-7651-3 |
| Ubuntu 24.04 LTS | linux-nvidia-6.11 | 6.11.0-1010.10 | — |
| Ubuntu 24.04 LTS | linux-nvidia-lowlatency | 6.8.0-1031.34.1 | USN-7651-3 |
| Ubuntu 24.04 LTS | linux-nvidia-tegra | 6.8.0-1008.8 | — |
| Ubuntu 24.04 LTS | linux-oem-6.11 | 6.11.0-1022.22 | USN-7521-1 |
| Ubuntu 24.04 LTS | linux-oem-6.8 | 6.8.0-1031.31 | USN-7651-1 |
| Ubuntu 24.04 LTS | linux-oracle | 6.8.0-1029.30 | USN-7651-3 |
| Ubuntu 24.04 LTS | linux-raspi | 6.8.0-1031.35 | USN-7651-6 |
| Ubuntu 24.04 LTS | linux-riscv +2 | No fix yet | — |
| Ubuntu 24.04 LTS | linux-xilinx | 6.8.0-1017.18 | — |
| Ubuntu 22.04 LTS | linux-aws-6.8 | 6.8.0-1032.34~22.04.1 | USN-7651-3 |
| Ubuntu 22.04 LTS | linux-azure-6.8 | 6.8.0-1034.39~22.04.1 | USN-7737-1 |
| Ubuntu 22.04 LTS | linux-gcp-6.8 | 6.8.0-1033.35~22.04.1 | USN-7651-4 |
| Ubuntu 22.04 LTS | linux-hwe-6.8 +1 | 6.8.0-64.67~22.04.1 | USN-7653-1 |
| Ubuntu 22.04 LTS | linux-ibm-6.8 | 6.8.0-1029.29~22.04.1 | USN-7651-2 |
| Ubuntu 22.04 LTS | linux-lowlatency-hwe-6.8 | 6.8.0-64.67.1~22.04.1 | USN-7651-2 |
| Ubuntu 22.04 LTS | linux-nvidia-6.8 | 6.8.0-1031.34~22.04.1 | USN-7651-3 |
| Ubuntu 22.04 LTS | linux-oracle-6.8 | 6.8.0-1029.30~22.04.1 | USN-7651-3 |
| Ubuntu 22.04 LTS | linux-riscv +32 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-gke +28 | No fix yet | — |
| Ubuntu 18.04 LTS | linux-gcp +14 | No fix yet | — |
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro Realtime 24.04 LTS | linux-raspi-realtime | 6.8.0-2026.27 | USN-7651-5 |
| Ubuntu Pro Realtime 24.04 LTS | linux-realtime | 6.8.1-1025.26 | USN-7652-1 |
| Ubuntu Pro Realtime 22.04 LTS | linux-realtime-6.8 | 6.8.1-1025.26~22.04.1 | — |
| Ubuntu Pro FIPS-updates 24.04 LTS | linux-fips | 6.8.0-78.78+fips1 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | rv +76 | 6.12.0-124.8.1.el10_1 | RHSA-2025:20095 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | rv +74 | 6.12.0-124.8.1.el10_1 | ALSA-2025:20095 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | kernel | 6.12.0-124.8.1.el10_1 | RLSA-2025:20095 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP6 | kernel-64kb +3 | 6.4.0-150600.23.47.2 | SUSE-SU-2025:1180-1 |
| SLES 15 SP6 | kernel-azure +1 | 6.4.0-150600.8.34.2 | SUSE-SU-2025:1177-1 |
| SLES 15 SP6 | kernel-coco +3 | 6.4.0-15061.21.coco15sp6.1 | SUSE-SU-2025:01919-1 |
| SLES 15 SP6 | kernel-default-base | 6.4.0-150600.23.47.2.150600.12.20.2 | SUSE-SU-2025:1180-1 |
| SLES 15 SP6 | kernel-docs +2 | 6.4.0-150600.23.47.1 | SUSE-SU-2025:1180-1 |
| SLES 15 SP6 | kernel-syms-azure | 6.4.0-150600.8.34.1 | SUSE-SU-2025:1177-1 |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLE Micro 6.1 | kernel-default-base | 6.4.0-28.1.21.6 | SUSE-SU-2025:20270-1 |
| SLE Micro 6.1 | kernel-livepatch-MICRO-6-0_Update_6 +1 | 1-3.1 | SUSE-SU-2025:20270-1, SUSE-SU-2025:20260-1 |
| SLE Micro 6.1 | kernel-rt +4 | 6.4.0-28.1 | SUSE-SU-2025:20270-1, SUSE-SU-2025:20260-1 |
| SLE Micro 6.0 | kernel-default-base | 6.4.0-28.1.21.6 | SUSE-SU-2025:20192-1 |
| SLE Micro 6.0 | kernel-livepatch-MICRO-6-0_Update_6 +1 | 1-3.1 | SUSE-SU-2025:20192-1, SUSE-SU-2025:20190-1 |
| SLE Micro 6.0 | kernel-rt +4 | 6.4.0-28.1 | SUSE-SU-2025:20192-1, SUSE-SU-2025:20190-1 |
| SLE Live Patching 15 SP6 | kernel-default | 6.4.0-150600.23.47.2 | SUSE-SU-2025:1180-1 |
| SLE Live Patching 15 SP6 | kernel-livepatch-SLE15-SP6-RT_Update_10 | 1-150600.1.5.1 | SUSE-SU-2025:1178-1 |
| SLE Live Patching 15 SP6 | kernel-livepatch-SLE15-SP6_Update_10 | 1-150600.13.5.1 | SUSE-SU-2025:1180-1 |
| SUSE Real Time Module 15 SP6 | kernel-rt +3 | 6.4.0-150600.10.34.1 | SUSE-SU-2025:1178-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.6 | dtb-aarch64 +4 | 6.4.0-150600.23.47.1 | SUSE-SU-2025:1180-1 |
| openSUSE Leap 15.6 | kernel-64kb +5 | 6.4.0-150600.23.47.2 | SUSE-SU-2025:1180-1 |
| openSUSE Leap 15.6 | kernel-azure +1 | 6.4.0-150600.8.34.2 | SUSE-SU-2025:1177-1 |
| openSUSE Leap 15.6 | kernel-default-base | 6.4.0-150600.23.47.2.150600.12.20.2 | SUSE-SU-2025:1180-1 |
| openSUSE Leap 15.6 | kernel-rt +3 | 6.4.0-150600.10.34.1 | SUSE-SU-2025:1178-1 |
| openSUSE Leap 15.6 | kernel-syms-azure | 6.4.0-150600.8.34.1 | SUSE-SU-2025:1177-1 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | kernel | No fix yet | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | kernel-uek +34 | 6.12.0-101.33.4.3.el10uek | ELSA-2025-20530, ELSA-2025-20480 |
Advisories 26
- WID-SEC-2025-0453 Linux Kernel: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 11, 2026
- USN-7737-1 linux-azure, linux-azure-6.8, linux-azure-nvidia vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-7653-1 linux-hwe-6.8 vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-7651-3 linux-aws-6.8, linux-gke, linux-gkeop, linux-nvidia, linux-nvidia-6.8, linux-nvidia-lowlatency, linux-oracle, linux-oracle-6.8 vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7651-2 linux-ibm, linux-ibm-6.8, linux-lowlatency, linux-lowlatency-hwe-6.8 vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7651-4 linux-gcp, linux-gcp-6.8 vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7651-6 linux-raspi vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7651-5 linux-raspi-realtime vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7652-1 linux-realtime vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7521-1 linux, linux-azure, linux-azure-6.11, linux-gcp, linux-gcp-6.11, linux-hwe-6.11, linux-oem-6.11, linux-raspi, linux-realtime vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7521-3 linux-lowlatency, linux-lowlatency-hwe-6.11, linux-oracle vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7651-1 linux, linux-aws, linux-oem-6.8 vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- ALSA-2025:20095 Moderate: kernel security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2025:20095 Red Hat Security Advisory: kernel security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- WID-SEC-2025-1439 Dell Secure Connect Gateway: Mehrere Schwachstellen ermöglichen nicht spezifizierten Angriff BSI CERT-Bund (WID) · Oct 11, 2026
- SUSE-SU-2025:20270-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:20192-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:20260-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:20190-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:01919-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:1177-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:1180-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:1178-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- RLSA-2025:20095 Moderate: kernel security update Rocky Linux Security Advisories · Nov 27, 2025
- ELSA-2025-20530 Important: Unbreakable Enterprise kernel security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Aug 18, 2025
- ELSA-2025-20480 Important: Unbreakable Enterprise kernel security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Jul 17, 2025
References
- https://git.kernel.org/stable/c/8dbc2d9e6b8612b9d5f41c0ea875e86183ff9617
- https://git.kernel.org/stable/c/01aaa7935af3050fd1e1e7de50001247c75baeab
- https://git.kernel.org/stable/c/b5cacfd067060c75088363ed3e19779078be2755
- https://git.kernel.org/stable/c/3229c15d6267de8e704b4085df8a82a5af2d63eb
- https://git.kernel.org/stable/c/3708acbd5f169ebafe1faa519cb28adc56295546