In the Linux kernel, the following vulnerability has been resolved:
tracing/timerlat: Fix a race during cpuhp processing
There is another found exception that the "timerlat/1" thread was scheduled on CPU0, and lead to timer corruption finally:
``` ODEBUG: init active (active state 0) object: ffff888237c2e108 object type: hrtimer hint: timerlat_irq+0x0/0x220 WARNING: CPU: 0 PID: 426 at lib/debugobjects.c:518 debug_print_object+0x7d/0xb0 Modules linked in: CPU: 0 UID: 0 PID: 426 Comm: timerlat/1 Not tainted 6.11.0-rc7+ #45 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 RIP: 0010:debug_print_object+0x7d/0xb0 ... Call Trace: <TASK> ? __warn+0x7c/0x110 ? debug_print_object+0x7d/0xb0 ? report_bug+0xf1/0x1d0 ? prb_read_valid+0x17/0x20 ? handle_bug+0x3f/0x70 ? exc_invalid_op+0x13/0x60 ? asm_exc_invalid_op+0x16/0x20 ? debug_print_object+0x7d/0xb0 ? debug_print_object+0x7d/0xb0 ? __pfx_timerlat_irq+0x10/0x10 __debug_object_init+0x110/0x150 hrtimer_init+0x1d/0x60 timerlat_main+0xab/0x2d0 ? __pfx_timerlat_main+0x10/0x10 kthread+0xb7/0xe0 ? __pfx_kthread+0x10/0x10 ret_from_fork+0x2d/0x40 ? __pfx_kthread+0x10/0x10 ret_from_fork_asm+0x1a/0x30 </TASK> ```
After tracing the scheduling event, it was discovered that the migration of the "timerlat/1" thread was performed during thread creation. Further analysis confirmed that it is because the CPU online processing for osnoise is implemented through workers, which is asynchronous with the offline processing. When the worker was scheduled to create a thread, the CPU may has already been removed from the cpu_online_mask during the offline process, resulting in the inability to select the right CPU:
T1 | T2 [CPUHP_ONLINE] | cpu_device_down() osnoise_hotplug_workfn() | | cpus_write_lock() | takedown_cpu(1) | cpus_write_unlock() [CPUHP_OFFLINE] | cpus_read_lock() | start_kthread(1) | cpus_read_unlock() |
To fix this, skip online processing if the CPU is already offline.
CVSS Details
- CVSS 3.1 Base Score: 7.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux-6.1Upgrade linux | Nov 11, 2024 | Oct 21, 2024 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Oct 21, 2024 |
| Ubuntu | — | Upgrade linux-image-lowlatency-64k-hwe-22.04Upgrade linux-image-6.8.0-1020-oracleUpgrade linux-image-6.11.0-18-generic-64kUpgrade linux-image-aws-lts-24.04Upgrade linux-image-6.11.0-1010-lowlatency-64kUpgrade linux-image-6.8.0-1023-awsUpgrade linux-image-generic-hwe-20.04Upgrade linux-image-oracleUpgrade linux-image-oem-22.04dUpgrade linux-image-genericUpgrade linux-image-virtual-hwe-20.04Upgrade linux-image-gkeop-5.15Upgrade linux-image-gcp-lts-24.04Upgrade linux-image-gcp-64kUpgrade linux-image-lowlatency-hwe-22.04Upgrade linux-image-5.15.0-1071-intel-iotgUpgrade linux-image-6.11.0-1008-raspiUpgrade linux-image-6.8.0-1024-oemUpgrade linux-image-5.15.0-1071-oracleUpgrade linux-image-realtimeUpgrade linux-image-6.8.0-1019-raspiUpgrade linux-image-5.15.0-127-generic-lpaeUpgrade linux-image-lowlatency-64k-hwe-20.04Upgrade linux-image-nvidia-lowlatency-64kUpgrade linux-image-intelUpgrade linux-image-gcp-64k-lts-24.04Upgrade linux-image-azure-lts-22.04Upgrade linux-image-gkeUpgrade linux-image-5.15.0-1056-gkeopUpgrade linux-image-5.15.0-1066-ibmUpgrade linux-image-generic-64kUpgrade linux-image-5.15.0-127-genericUpgrade linux-image-6.8.0-1022-nvidia-lowlatencyUpgrade linux-image-gkeopUpgrade linux-image-oem-24.04Upgrade linux-image-raspiUpgrade linux-image-intel-iotgUpgrade linux-image-lowlatency-64kUpgrade linux-image-5.15.0-1039-xilinx-zynqmpUpgrade linux-image-gcp-lts-22.04Upgrade linux-image-oracle-lts-22.04Upgrade linux-image-nvidia-6.8Upgrade linux-image-5.15.0-1072-gcpUpgrade linux-image-oracle-lts-24.04Upgrade linux-image-azureUpgrade linux-image-5.15.0-1078-azureUpgrade linux-image-generic-lpae-hwe-20.04Upgrade linux-image-nvidia-hwe-22.04Upgrade linux-image-6.8.0-57-genericUpgrade linux-image-5.15.0-1073-awsUpgrade linux-image-raspi-nolpaeUpgrade linux-image-6.11.0-18-genericUpgrade linux-image-xilinx-zynqmpUpgrade linux-image-oem-20.04Upgrade linux-image-oem-22.04Upgrade linux-image-generic-64k-hwe-22.04Upgrade linux-image-5.15.0-1070-kvmUpgrade linux-image-6.11.0-1015-oemUpgrade linux-image-azure-cvmUpgrade linux-image-6.8.0-1025-azureUpgrade linux-image-6.11.0-1009-awsUpgrade linux-image-6.8.0-1020-oracle-64kUpgrade linux-image-gkeop-6.8Upgrade linux-image-6.8.0-1025-azure-fdeUpgrade linux-image-6.8.0-1006-gkeopUpgrade linux-image-generic-64k-hwe-20.04Upgrade linux-image-nvidia-64k-hwe-22.04Upgrade linux-image-oracle-64kUpgrade linux-image-6.8.0-54-genericUpgrade linux-image-6.8.0-1022-ibmUpgrade linux-image-nvidiaUpgrade linux-image-5.15.0-127-generic-64kUpgrade linux-image-6.11.0-1009-azure-fdeUpgrade linux-image-nvidia-64kUpgrade linux-image-oem-22.04bUpgrade linux-image-oem-22.04cUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-oem-24.04bUpgrade linux-image-5.15.0-1066-raspiUpgrade linux-image-generic-lpaeUpgrade linux-image-ibm-lts-24.04Upgrade linux-image-generic-hwe-24.04Upgrade linux-image-6.11.0-1010-lowlatencyUpgrade linux-image-6.8.0-54-generic-64kUpgrade linux-image-kvmUpgrade linux-image-oem-22.04aUpgrade linux-image-generic-hwe-22.04Upgrade linux-image-gcpUpgrade linux-image-ibm-classicUpgrade linux-image-realtime-hwe-24.04Upgrade linux-image-azure-fdeUpgrade linux-image-awsUpgrade linux-image-nvidia-64k-6.8Upgrade linux-image-nvidia-lowlatencyUpgrade linux-image-oracle-64k-lts-24.04Upgrade linux-image-lowlatency-hwe-20.04Upgrade linux-image-ibmUpgrade linux-image-6.11.0-1009-gcpUpgrade linux-image-6.8.0-1024-gcpUpgrade linux-image-6.8.0-1014-azure-nvidiaUpgrade linux-image-azure-fde-lts-24.04Upgrade linux-image-5.15.0-1068-nvidiaUpgrade linux-image-6.11.0-1005-realtimeUpgrade linux-image-oem-20.04dUpgrade linux-image-6.8.0-1022-nvidia-64kUpgrade linux-image-6.11.0-1009-azureUpgrade linux-image-oem-20.04cUpgrade linux-image-6.8.0-1022-nvidia-lowlatency-64kUpgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-oem-24.04aUpgrade linux-image-5.15.0-1070-gkeUpgrade linux-image-6.8.0-1022-nvidiaUpgrade linux-image-oem-20.04bUpgrade linux-image-gke-5.15Upgrade linux-image-6.8.0-1019-gkeUpgrade linux-image-azure-lts-24.04Upgrade linux-image-6.8.0-57-generic-64kUpgrade linux-image-5.15.0-127-lowlatencyUpgrade linux-image-virtual-hwe-22.04Upgrade linux-image-5.15.0-1068-nvidia-lowlatencyUpgrade linux-image-6.8.0-1024-gcp-64kUpgrade linux-image-lowlatencyUpgrade linux-image-virtualUpgrade linux-image-6.11.0-1011-oracleUpgrade linux-image-6.11.0-1011-oracle-64kUpgrade linux-image-5.15.0-127-lowlatency-64kUpgrade linux-image-aws-lts-22.04Upgrade linux-image-6.8.0-54-lowlatencyUpgrade linux-image-6.8.0-54-lowlatency-64kUpgrade linux-image-azure-nvidia | Dec 18, 2024 | Oct 21, 2024 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Oct 14, 2025 | Oct 21, 2024 |
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