In the Linux kernel, the following vulnerability has been resolved:
dax: Fix dax_mapping_release() use after free
A CONFIG_DEBUG_KOBJECT_RELEASE test of removing a device-dax region provider (like modprobe -r dax_hmem) yields:
kobject: 'mapping0' (ffff93eb460e8800): kobject_release, parent 0000000000000000 (delayed 2000) [..] DEBUG_LOCKS_WARN_ON(1) WARNING: CPU: 23 PID: 282 at kernel/locking/lockdep.c:232 __lock_acquire+0x9fc/0x2260 [..] RIP: 0010:__lock_acquire+0x9fc/0x2260 [..] Call Trace: <TASK> [..] lock_acquire+0xd4/0x2c0 ? ida_free+0x62/0x130 _raw_spin_lock_irqsave+0x47/0x70 ? ida_free+0x62/0x130 ida_free+0x62/0x130 dax_mapping_release+0x1f/0x30 device_release+0x36/0x90 kobject_delayed_cleanup+0x46/0x150
Due to attempting ida_free() on an ida object that has already been freed. Devices typically only hold a reference on their parent while registered. If a child needs a parent object to complete its release it needs to hold a reference that it drops from its release callback. Arrange for a dax_mapping to pin its parent dev_dax instance until dax_mapping_release().
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade kernel-tools-debuginfoUpgrade python-perfUpgrade kernel-livepatch-5.15.122-77.145Upgrade bpftoolUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-livepatch-5.10.192-182.736Upgrade kernel-toolsUpgrade python-perf-debuginfoUpgrade kernel-debuginfoUpgrade bpftool-debuginfoUpgrade perf-debuginfoUpgrade kernel-tools-develUpgrade perfUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-headersUpgrade kernelUpgrade kernel-devel | May 20, 2026 | May 20, 2026 |
| Amazon_linux_2023 | — | Upgrade python3-perfUpgrade kernel-headersUpgrade kernel-toolsUpgrade kernel-tools-develUpgrade kernel-libbpfUpgrade perfUpgrade kernel-debuginfoUpgrade kernel-develUpgrade perf-debuginfoUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-livepatch-6.1.41-63.109Upgrade kernel-libbpf-staticUpgrade kernelUpgrade bpftool-debuginfoUpgrade bpftoolUpgrade python3-perf-debuginfoUpgrade kernel-tools-debuginfoUpgrade kernel-libbpf-develUpgrade kernel-debuginfo-common-x86_64 | Oct 24, 2025 | Oct 4, 2025 |
| Debian | — | Upgrade linux | Oct 6, 2025 | Oct 6, 2025 |
| Huawei Euleros 2_0_sp13 | — | Upgrade kernelUpgrade kernel-abi-stablelistsUpgrade python3-perfUpgrade bpftoolUpgrade kernel-toolsUpgrade kernel-tools-libs | Feb 3, 2026 | Feb 2, 2026 |
| Redhat_linux | — | Upgrade kernel-rtNo solution existsUpgrade kernel | Nov 14, 2025 | Oct 4, 2025 |
| Ubuntu | — | Upgrade linux-xilinx-zynqmpUpgrade linux-azureUpgrade linux-kvmUpgrade linux-intel-iotg-5.15Upgrade linux-oracleUpgrade linux-hwe-5.15Upgrade linux-gkeopUpgrade linux-intel-iotgUpgrade linux-azure-5.15Upgrade linux-gcpUpgrade linux-ibmUpgrade linux-intel-iot-realtimeUpgrade linux-oracle-5.15Upgrade linux-nvidiaUpgrade linux-gcp-5.15Upgrade linux-nvidia-tegra-igxUpgrade linux-awsUpgrade linux-riscv-5.15Upgrade linux-realtimeUpgrade linux-raspiUpgrade linux-azure-fdeUpgrade linuxUpgrade linux-nvidia-tegra-5.15Upgrade linux-nvidia-tegraUpgrade linux-bluefieldUpgrade linux-ibm-5.15Upgrade linux-lowlatency-hwe-5.15Upgrade linux-gkeUpgrade linux-lowlatencyUpgrade linux-aws-5.15 | Oct 10, 2025 | Oct 4, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Oct 15, 2025 | Oct 4, 2025 |
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