In the Linux kernel, the following vulnerability has been resolved:
iommu/amd/iommu_v2: Fix pasid_state refcount dec hit 0 warning on pasid unbind
When unbinding pasid - a race condition exists vs outstanding page faults.
To prevent this, the pasid_state object contains a refcount. * set to 1 on pasid bind * incremented on each ppr notification start * decremented on each ppr notification done * decremented on pasid unbind
Since refcount_dec assumes that refcount will never reach 0: the current implementation causes the following to be invoked on pasid unbind: REFCOUNT_WARN("decrement hit 0; leaking memory")
Fix this issue by changing refcount_dec to refcount_dec_and_test to explicitly handle refcount=1.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade kernel-toolsUpgrade kernel-livepatch-5.15.133-86.144Upgrade python-perfUpgrade python-perf-debuginfoUpgrade kernel-headersUpgrade kernel-debuginfo-common-x86_64Upgrade bpftool-debuginfoUpgrade kernel-debuginfoUpgrade kernel-tools-debuginfoUpgrade kernel-develUpgrade perf-debuginfoUpgrade kernel-tools-develUpgrade kernel-debuginfo-common-aarch64Upgrade kernelUpgrade perfUpgrade bpftool | May 20, 2026 | May 20, 2026 |
| Amazon_linux_2023 | — | Upgrade kernel-develUpgrade perfUpgrade kernel-debuginfo-common-aarch64Upgrade perf-debuginfoUpgrade kernel-toolsUpgrade bpftool-debuginfoUpgrade bpftoolUpgrade kernelUpgrade kernel-libbpf-develUpgrade kernel-tools-develUpgrade kernel-headersUpgrade python3-perf-debuginfoUpgrade python3-perfUpgrade kernel-libbpfUpgrade kernel-tools-debuginfoUpgrade kernel-livepatch-6.1.55-75.123Upgrade kernel-libbpf-staticUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-debuginfo | Oct 24, 2025 | Oct 1, 2025 |
| Debian | — | Upgrade linux | Oct 3, 2025 | Oct 3, 2025 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Oct 1, 2025 |
| Ubuntu | — | Upgrade linux-hwe-5.15Upgrade linux-raspiUpgrade linux-nvidia-tegra-5.15Upgrade linux-awsUpgrade linux-bluefieldUpgrade linux-azureUpgrade linuxUpgrade linux-gcp-fipsUpgrade linux-aws-fipsUpgrade linux-kvmUpgrade linux-riscv-5.15Upgrade linux-intel-iot-realtimeUpgrade linux-nvidia-tegraUpgrade linux-fipsUpgrade linux-lowlatency-hwe-5.15Upgrade linux-azure-5.15Upgrade linux-oracleUpgrade linux-nvidia-tegra-igxUpgrade linux-ibmUpgrade linux-gkeUpgrade linux-oracle-5.15Upgrade linux-azure-fdeUpgrade linux-aws-5.15Upgrade linux-nvidiaUpgrade linux-gkeopUpgrade linux-xilinx-zynqmpUpgrade linux-ibm-5.15Upgrade linux-intel-iotgUpgrade linux-gcp-5.15Upgrade linux-lowlatencyUpgrade linux-intel-iotg-5.15Upgrade linux-gcpUpgrade linux-realtime | Oct 10, 2025 | Oct 1, 2025 |
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