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In the Linux kernel, the following vulnerability has been resolved:
mm/khugepaged: invoke MMU notifiers in shmem/file collapse paths
Any codepath that zaps page table entries must invoke MMU notifiers to ensure that secondary MMUs (like KVM) don't keep accessing pages which aren't mapped anymore. Secondary MMUs don't hold their own references to pages that are mirrored over, so failing to notify them can lead to page use-after-free.
I'm marking this as addressing an issue introduced in commit f3f0e1d2150b ("khugepaged: add support of collapse for tmpfs/shmem pages"), but most of the security impact of this only came in commit 27e1f8273113 ("khugepaged: enable collapse pmd for pte-mapped THP"), which actually omitted flushes for the removal of present PTEs, not just for the removal of empty page tables.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade kernel-develUpgrade kernel-debuginfoUpgrade kernel-tools-develUpgrade kernelUpgrade kernel-headersUpgrade python-perf-debuginfoUpgrade kernel-tools-debuginfoUpgrade kernel-debuginfo-common-x86_64Upgrade perf-debuginfoUpgrade kernel-livepatch-5.10.162-141.675Upgrade perfUpgrade bpftool-debuginfoUpgrade kernel-livepatch-5.15.86-53.137Upgrade bpftoolUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-toolsUpgrade kernel-livepatch-4.14.304-226.531Upgrade python-perf | Jan 22, 2025 | Oct 21, 2024 |
| Amazon_linux | — | Upgrade kernel | Jan 23, 2025 | Mar 20, 2023 |
| Debian | — | Upgrade linux | Oct 23, 2024 | Oct 23, 2024 |
| Dell Powerstore Dsa2025223 | — | Upgrade Dell PowerStoreOS to the latest version | Oct 23, 2025 | May 27, 2025 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Oct 21, 2024 |
| Ubuntu | — | Upgrade linux-aws-5.4Upgrade linux-fipsUpgrade linux-riscv-5.15Upgrade linux-aws-hweUpgrade linuxUpgrade linux-raspiUpgrade linux-bluefieldUpgrade linux-realtimeUpgrade linux-aws-5.15Upgrade linux-gkeUpgrade linux-azure-fdeUpgrade linux-lowlatencyUpgrade linux-nvidia-tegra-5.15Upgrade linux-lowlatency-hwe-5.15Upgrade linux-raspi-5.4Upgrade linux-ibm-5.4Upgrade linux-oracle-5.4Upgrade linux-awsUpgrade linux-gkeop-5.15Upgrade linux-hwe-5.4Upgrade linux-xilinx-zynqmpUpgrade linux-hwe-5.15Upgrade linux-gkeopUpgrade linux-intel-iot-realtimeUpgrade linux-ibmUpgrade linux-azureUpgrade linux-gcp-5.4Upgrade linux-azure-fipsUpgrade linux-nvidiaUpgrade linux-intel-iotg-5.15Upgrade linux-intel-iotgUpgrade linux-iotUpgrade linux-azure-5.4Upgrade linux-gcp-4.15Upgrade linux-azure-5.15Upgrade linux-azure-4.15Upgrade linux-gcp-5.15Upgrade linux-hweUpgrade linux-gcpUpgrade linux-oracle-5.15Upgrade linux-aws-fipsUpgrade linux-gcp-fipsUpgrade linux-oracleUpgrade linux-kvm | Nov 19, 2024 | Oct 21, 2024 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | Oct 21, 2024 |
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