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.
CVSS Details
- CVSS 3.1 Base Score: 8.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade perf-debuginfoUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-toolsUpgrade kernel-livepatch-5.15.86-53.137Upgrade perfUpgrade kernel-livepatch-5.10.162-141.675Upgrade bpftoolUpgrade kernel-livepatch-4.14.304-226.531Upgrade bpftool-debuginfoUpgrade python-perfUpgrade kernel-debuginfo-common-x86_64Upgrade python-perf-debuginfoUpgrade kernel-tools-debuginfoUpgrade kernel-tools-develUpgrade kernel-develUpgrade kernel-debuginfoUpgrade kernel-headersUpgrade kernel | 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-lowlatency-hwe-5.15Upgrade linux-nvidia-tegra-5.15Upgrade linux-oracle-5.4Upgrade linux-aws-hweUpgrade linux-bluefieldUpgrade linux-ibm-5.4Upgrade linux-azure-fdeUpgrade linux-gkeUpgrade linux-riscv-5.15Upgrade linux-awsUpgrade linux-aws-5.4Upgrade linux-raspiUpgrade linux-raspi-5.4Upgrade linux-realtimeUpgrade linux-aws-5.15Upgrade linux-lowlatencyUpgrade linuxUpgrade linux-fipsUpgrade linux-nvidiaUpgrade linux-oracle-5.15Upgrade linux-aws-fipsUpgrade linux-hwe-5.4Upgrade linux-intel-iot-realtimeUpgrade linux-ibmUpgrade linux-gcp-fipsUpgrade linux-gcp-5.4Upgrade linux-oracleUpgrade linux-azure-5.4Upgrade linux-gcp-4.15Upgrade linux-hweUpgrade linux-azure-fipsUpgrade linux-gcpUpgrade linux-intel-iotg-5.15Upgrade linux-gcp-5.15Upgrade linux-iotUpgrade linux-azure-5.15Upgrade linux-azure-4.15Upgrade linux-intel-iotgUpgrade linux-gkeopUpgrade linux-azureUpgrade linux-xilinx-zynqmpUpgrade linux-hwe-5.15Upgrade linux-kvmUpgrade linux-gkeop-5.15 | 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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