In the Linux kernel, the following vulnerability has been resolved:
mm: slub: avoid wake up kswapd in set_track_prepare
set_track_prepare() can incur lock recursion. The issue is that it is called from hrtimer_start_range_ns holding the per_cpu(hrtimer_bases)[n].lock, but when enabled CONFIG_DEBUG_OBJECTS_TIMERS, may wake up kswapd in set_track_prepare, and try to hold the per_cpu(hrtimer_bases)[n].lock.
Avoid deadlock caused by implicitly waking up kswapd by passing in allocation flags, which do not contain __GFP_KSWAPD_RECLAIM in the debug_objects_fill_pool() case. Inside stack depot they are processed by gfp_nested_mask(). Since ___slab_alloc() has preemption disabled, we mask out __GFP_DIRECT_RECLAIM from the flags there.
The oops looks something like:
BUG: spinlock recursion on CPU#3, swapper/3/0 lock: 0xffffff8a4bf29c80, .magic: dead4ead, .owner: swapper/3/0, .owner_cpu: 3 Hardware name: Qualcomm Technologies, Inc. Popsicle based on SM8850 (DT) Call trace: spin_bug+0x0 _raw_spin_lock_irqsave+0x80 hrtimer_try_to_cancel+0x94 task_contending+0x10c enqueue_dl_entity+0x2a4 dl_server_start+0x74 enqueue_task_fair+0x568 enqueue_task+0xac do_activate_task+0x14c ttwu_do_activate+0xcc try_to_wake_up+0x6c8 default_wake_function+0x20 autoremove_wake_function+0x1c __wake_up+0xac wakeup_kswapd+0x19c wake_all_kswapds+0x78 __alloc_pages_slowpath+0x1ac __alloc_pages_noprof+0x298 stack_depot_save_flags+0x6b0 stack_depot_save+0x14 set_track_prepare+0x5c ___slab_alloc+0xccc __kmalloc_cache_noprof+0x470 __set_page_owner+0x2bc post_alloc_hook[jt]+0x1b8 prep_new_page+0x28 get_page_from_freelist+0x1edc __alloc_pages_noprof+0x13c alloc_slab_page+0x244 allocate_slab+0x7c ___slab_alloc+0x8e8 kmem_cache_alloc_noprof+0x450 debug_objects_fill_pool+0x22c debug_object_activate+0x40 enqueue_hrtimer[jt]+0xdc hrtimer_start_range_ns+0x5f8 ...
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade rtlaUpgrade kernel-64k-devel-matchedUpgrade kernel-64k-debug-modulesUpgrade kernel-zfcpdump-devel-matchedUpgrade kernel-64k-modules-extraUpgrade kernel-docUpgrade kernel-64k-debug-develUpgrade kernel-develUpgrade kernel-devel-matchedUpgrade kernel-debug-develUpgrade perfUpgrade python3-perfUpgrade kernel-64k-debug-devel-matchedUpgrade kernel-debug-devel-matchedUpgrade kernel-64kUpgrade kernel-zfcpdump-develUpgrade kernel-64k-debug-modules-extraUpgrade kernel-headersUpgrade kernel-64k-debug-coreUpgrade kernel-abi-stablelistsUpgrade kernel-64k-develUpgrade rvUpgrade kernelUpgrade kernel-64k-coreUpgrade kernel-64k-debug | Dec 2, 2025 | Nov 24, 2025 |
| Amazon_linux_2023 | — | Upgrade kernel-modules-extraUpgrade kernel6.12-develUpgrade kernel-debuginfo-common-x86_64Upgrade kernel6.12-debuginfo-common-x86_64Upgrade kernel-libbpf-staticUpgrade kernel-debuginfoUpgrade perf6.12Upgrade bpftoolUpgrade python3-perf-debuginfoUpgrade kernelUpgrade kernel-tools-debuginfoUpgrade kernel-libbpfUpgrade kernel6.12-headersUpgrade bpftool-debuginfoUpgrade kernel-libbpf-develUpgrade kernel6.12-debuginfoUpgrade python3-perf6.12-debuginfoUpgrade kernel6.12-modules-extraUpgrade kernel-livepatch-6.1.153-175.280Upgrade kernel-libbpf-debuginfoUpgrade kernel6.12-debuginfo-common-aarch64Upgrade kernel6.12-modules-extra-commonUpgrade kernel-debuginfo-common-aarch64Upgrade perf6.12-debuginfoUpgrade kernel6.12-libbpf-develUpgrade kernel6.12-libbpfUpgrade kernel6.12Upgrade kernel-livepatch-6.12.46-66.121Upgrade kernel-develUpgrade python3-perf6.12Upgrade perf-debuginfoUpgrade kernel6.12-tools-debuginfoUpgrade kernel-livepatch-6.1.155-176.282Upgrade kernel-headersUpgrade kernel6.12-libbpf-debuginfoUpgrade kernel-modules-extra-commonUpgrade kernel6.12-tools-develUpgrade bpftool6.12Upgrade kernel-tools-develUpgrade python3-perfUpgrade bpftool6.12-debuginfoUpgrade kernel6.12-libbpf-staticUpgrade kernel-toolsUpgrade perfUpgrade kernel6.12-tools | Sep 30, 2025 | Sep 19, 2025 |
| Debian | — | Upgrade linux-6.1Upgrade linux | Sep 25, 2025 | Sep 25, 2025 |
| Oracle_linux | — | Upgrade kernel-uekUpgrade kernel | Nov 11, 2025 | Sep 19, 2025 |
| Redhat_linux | — | Upgrade kernel-rtUpgrade kernelNo solution exists | Nov 25, 2025 | Sep 19, 2025 |
| Rocky_linux | — | Upgrade perf-debuginfoUpgrade kernelUpgrade kernel-zfcpdump-modulesUpgrade kernel-zfcpdump-modules-coreUpgrade rvUpgrade python3-perfUpgrade kernel-toolsUpgrade kernel-zfcpdump-debuginfoUpgrade kernel-modules-coreUpgrade kernel-rtUpgrade libperf-debuginfoUpgrade kernel-tools-libs-develUpgrade kernel-debuginfo-common-s390xUpgrade kernel-uki-virt-addonsUpgrade kernel-rt-modules-extraUpgrade kernel-rt-debug-modules-extraUpgrade libperfUpgrade perfUpgrade kernel-rt-modules-coreUpgrade kernel-zfcpdump-coreUpgrade kernel-devel-matchedUpgrade kernel-debug-devel-matchedUpgrade kernel-zfcpdump-develUpgrade kernel-rt-debug-develUpgrade kernel-debug-uki-virtUpgrade kernel-debug-modules-coreUpgrade kernel-rt-debug-debuginfoUpgrade kernel-rt-debug-coreUpgrade kernel-develUpgrade kernel-rt-debug-modules-coreUpgrade kernel-debuginfoUpgrade kernel-debugUpgrade kernel-modulesUpgrade kernel-rt-debug-modulesUpgrade kernel-debug-coreUpgrade kernel-coreUpgrade kernel-zfcpdump-modules-extraUpgrade kernel-rt-develUpgrade python3-perf-debuginfoUpgrade kernel-zfcpdump-devel-matchedUpgrade kernel-uki-virtUpgrade kernel-debug-modules-extraUpgrade kernel-rt-debuginfoUpgrade kernel-modules-extra-matchedUpgrade kernel-debug-modulesUpgrade rtlaUpgrade kernel-tools-libsUpgrade kernel-rt-modulesUpgrade kernel-rt-coreUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-debug-develUpgrade kernel-tools-debuginfoUpgrade kernel-rt-debugUpgrade kernel-zfcpdumpUpgrade kernel-debug-debuginfoUpgrade kernel-modules-extra | Jan 19, 2026 | Jan 17, 2026 |
| Ubuntu | — | Upgrade linux-image-xilinxUpgrade linux-image-6.8.0-106-fipsUpgrade linux-image-oracle-6.8Upgrade linux-image-nvidia-6.8Upgrade linux-image-oem-22.04cUpgrade linux-image-6.8.0-1049-nvidia-64kUpgrade linux-image-oem-22.04dUpgrade linux-image-6.8.0-106-generic-64kUpgrade linux-image-nvidia-64k-hwe-22.04Upgrade linux-image-xilinx-zynqmpUpgrade linux-image-intel-iot-realtimeUpgrade linux-image-6.8.0-106-lowlatencyUpgrade linux-image-gkeopUpgrade linux-image-nvidia-64kUpgrade linux-image-6.8.0-1049-ibmUpgrade linux-image-gcp-6.8Upgrade linux-image-6.8.0-1052-azure-fipsUpgrade linux-image-oracle-64kUpgrade linux-image-6.8.0-1052-gcp-64kUpgrade linux-image-fipsUpgrade linux-image-gcp-64k-lts-24.04Upgrade linux-image-generic-64k-hwe-22.04Upgrade linux-image-generic-lpaeUpgrade linux-image-generic-64kUpgrade linux-image-oracle-lts-24.04Upgrade linux-image-gcpUpgrade linux-image-gcp-fips-6.8Upgrade linux-image-virtual-hwe-22.04Upgrade linux-image-6.8.0-1050-aws-64kUpgrade linux-image-realtimeUpgrade linux-image-lowlatency-64k-6.8Upgrade linux-image-nvidia-lowlatency-64k-6.8Upgrade linux-image-aws-64kUpgrade linux-image-nvidia-lowlatency-6.8Upgrade linux-image-oem-22.04Upgrade linux-image-6.8.0-1035-gkeopUpgrade linux-image-6.8.0-1047-oracleUpgrade linux-image-gkeUpgrade linux-image-6.8.0-1051-azureUpgrade linux-image-gcp-64k-6.8Upgrade linux-image-gke-6.8Upgrade linux-image-lowlatency-64kUpgrade linux-image-nvidiaUpgrade linux-image-azure-6.8Upgrade linux-image-6.8.0-1049-nvidia-lowlatency-64kUpgrade linux-image-6.8.1-1045-realtimeUpgrade linux-image-oracleUpgrade linux-image-genericUpgrade linux-image-lowlatency-64k-hwe-22.04Upgrade linux-image-raspi-realtimeUpgrade linux-image-nvidia-hwe-22.04Upgrade linux-image-6.8.0-1029-xilinxUpgrade linux-image-6.8.0-1049-nvidiaUpgrade linux-image-virtualUpgrade linux-image-6.8.0-1049-nvidia-lowlatencyUpgrade linux-image-intel-iotgUpgrade linux-image-realtime-hwe-22.04Upgrade linux-image-gke-64k-6.8Upgrade linux-image-nvidia-64k-6.8Upgrade linux-image-aws-lts-24.04Upgrade linux-image-fips-6.8Upgrade linux-image-xilinx-6.8Upgrade linux-image-oem-22.04bUpgrade linux-image-realtime-6.8.1Upgrade linux-image-raspi-6.8Upgrade linux-image-aws-fipsUpgrade linux-image-raspiUpgrade linux-image-6.8.0-1052-gcp-fipsUpgrade linux-image-oem-22.04aUpgrade linux-image-6.8.0-1052-gcpUpgrade linux-image-6.8.0-1050-raspiUpgrade linux-image-ibm-6.8Upgrade linux-image-lowlatency-6.8Upgrade linux-image-6.8.0-1050-aws-fipsUpgrade linux-image-6.8.0-1048-gke-64kUpgrade linux-image-raspi-realtime-6.8Upgrade linux-image-oracle-64k-lts-24.04Upgrade linux-image-gke-64kUpgrade linux-image-gkeop-6.8Upgrade linux-image-6.8.0-1048-gkeUpgrade linux-image-gcp-64kUpgrade linux-image-azure-fips-6.8Upgrade linux-image-aws-64k-lts-24.04Upgrade linux-image-6.8.0-1050-awsUpgrade linux-image-ibm-lts-24.04Upgrade linux-image-generic-hwe-22.04Upgrade linux-image-generic-6.8Upgrade linux-image-ibm-classicUpgrade linux-image-awsUpgrade linux-image-azureUpgrade linux-image-azure-fipsUpgrade linux-image-ibmUpgrade linux-image-nvidia-lowlatency-64kUpgrade linux-image-aws-6.8Upgrade linux-image-6.8.0-2040-raspi-realtimeUpgrade linux-image-nvidia-lowlatencyUpgrade linux-image-lowlatency-hwe-22.04Upgrade linux-image-aws-fips-6.8Upgrade linux-image-6.8.0-106-lowlatency-64kUpgrade linux-image-virtual-6.8Upgrade linux-image-oracle-64k-6.8Upgrade linux-image-6.8.0-106-genericUpgrade linux-image-lowlatencyUpgrade linux-image-azure-lts-24.04Upgrade linux-image-aws-64k-6.8Upgrade linux-image-kvmUpgrade linux-image-gcp-lts-24.04Upgrade linux-image-generic-64k-6.8Upgrade linux-image-gcp-fipsUpgrade linux-image-6.8.0-1047-oracle-64k | Mar 17, 2026 | Sep 19, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Oct 10, 2025 | Sep 19, 2025 |
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