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-6.8.0-1022-ibmUpgrade linux-image-oem-20.04dUpgrade linux-image-oracle-64k-lts-24.04Upgrade linux-image-generic-lpaeUpgrade linux-image-generic-hwe-22.04Upgrade linux-image-ibm-lts-24.04Upgrade linux-image-6.8.0-1006-gkeopUpgrade linux-image-realtime-hwe-24.04Upgrade linux-image-6.8.0-1024-gcp-64kUpgrade linux-image-lowlatencyUpgrade linux-image-lowlatency-hwe-20.04Upgrade linux-image-5.15.0-1068-nvidia-lowlatencyUpgrade linux-image-ibmUpgrade linux-image-6.8.0-54-generic-64kUpgrade linux-image-5.15.0-127-lowlatency-64kUpgrade linux-image-6.11.0-1011-oracleUpgrade linux-image-azure-lts-24.04Upgrade linux-image-6.8.0-54-lowlatencyUpgrade linux-image-virtualUpgrade linux-image-aws-lts-22.04Upgrade linux-image-6.11.0-1011-oracle-64kUpgrade linux-image-6.8.0-54-lowlatency-64kUpgrade linux-image-azure-nvidiaUpgrade linux-image-virtual-hwe-22.04Upgrade linux-image-6.8.0-1025-azure-fdeUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-ibm-classicUpgrade linux-image-5.15.0-127-generic-64kUpgrade linux-image-oracle-64kUpgrade linux-image-nvidia-64kUpgrade linux-image-6.11.0-1009-gcpUpgrade linux-image-6.11.0-1009-azure-fdeUpgrade linux-image-6.11.0-1005-realtimeUpgrade linux-image-generic-64k-hwe-20.04Upgrade linux-image-5.15.0-1068-nvidiaUpgrade linux-image-gkeop-6.8Upgrade linux-image-5.15.0-127-lowlatencyUpgrade linux-image-nvidiaUpgrade linux-image-6.8.0-57-generic-64kUpgrade linux-image-6.8.0-54-genericUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-6.8.0-1014-azure-nvidiaUpgrade linux-image-azure-fde-lts-24.04Upgrade linux-image-6.8.0-1022-nvidia-64kUpgrade linux-image-oem-24.04aUpgrade linux-image-oem-20.04cUpgrade linux-image-6.8.0-1019-gkeUpgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-gke-5.15Upgrade linux-image-6.11.0-1009-azureUpgrade linux-image-6.8.0-1022-nvidia-lowlatency-64kUpgrade linux-image-oem-20.04bUpgrade linux-image-oem-22.04bUpgrade linux-image-6.11.0-1010-lowlatencyUpgrade linux-image-6.8.0-1022-nvidiaUpgrade linux-image-kvmUpgrade linux-image-oem-22.04aUpgrade linux-image-oem-24.04bUpgrade linux-image-6.8.0-1024-gcpUpgrade linux-image-gcpUpgrade linux-image-awsUpgrade linux-image-5.15.0-1070-gkeUpgrade linux-image-nvidia-64k-hwe-22.04Upgrade linux-image-oem-22.04cUpgrade linux-image-azure-fdeUpgrade linux-image-nvidia-64k-6.8Upgrade linux-image-5.15.0-1066-raspiUpgrade linux-image-nvidia-lowlatencyUpgrade linux-image-oem-20.04Upgrade linux-image-lowlatency-64k-hwe-20.04Upgrade linux-image-5.15.0-1071-intel-iotgUpgrade linux-image-lowlatency-64kUpgrade linux-image-5.15.0-1078-azureUpgrade linux-image-6.8.0-1025-azureUpgrade linux-image-5.15.0-1066-ibmUpgrade linux-image-nvidia-lowlatency-64kUpgrade linux-image-aws-lts-24.04Upgrade linux-image-nvidia-hwe-22.04Upgrade linux-image-6.11.0-1015-oemUpgrade linux-image-realtimeUpgrade linux-image-generic-64kUpgrade linux-image-6.8.0-1019-raspiUpgrade linux-image-lowlatency-hwe-22.04Upgrade linux-image-intelUpgrade linux-image-6.8.0-1024-oemUpgrade linux-image-gcp-64kUpgrade linux-image-5.15.0-1071-oracleUpgrade linux-image-generic-64k-hwe-22.04Upgrade linux-image-xilinx-zynqmpUpgrade linux-image-azure-cvmUpgrade linux-image-6.8.0-1020-oracle-64kUpgrade linux-image-5.15.0-1073-awsUpgrade linux-image-5.15.0-1070-kvmUpgrade linux-image-oem-22.04dUpgrade linux-image-generic-hwe-20.04Upgrade linux-image-6.8.0-1020-oracleUpgrade linux-image-raspiUpgrade linux-image-gkeUpgrade linux-image-5.15.0-1056-gkeopUpgrade linux-image-6.8.0-1023-awsUpgrade linux-image-6.11.0-1010-lowlatency-64kUpgrade linux-image-lowlatency-64k-hwe-22.04Upgrade linux-image-oracleUpgrade linux-image-6.11.0-18-generic-64kUpgrade linux-image-intel-iotgUpgrade linux-image-6.8.0-1022-nvidia-lowlatencyUpgrade linux-image-gcp-lts-24.04Upgrade linux-image-gcp-lts-22.04Upgrade linux-image-6.11.0-1008-raspiUpgrade linux-image-oem-24.04Upgrade linux-image-5.15.0-127-genericUpgrade linux-image-azure-lts-22.04Upgrade linux-image-oracle-lts-24.04Upgrade linux-image-gcp-64k-lts-24.04Upgrade linux-image-genericUpgrade linux-image-nvidia-6.8Upgrade linux-image-5.15.0-127-generic-lpaeUpgrade linux-image-gkeop-5.15Upgrade linux-image-raspi-nolpaeUpgrade linux-image-oracle-lts-22.04Upgrade linux-image-oem-22.04Upgrade linux-image-gkeopUpgrade linux-image-6.8.0-57-genericUpgrade linux-image-6.11.0-1009-awsUpgrade linux-image-generic-lpae-hwe-20.04Upgrade linux-image-6.11.0-18-genericUpgrade linux-image-5.15.0-1039-xilinx-zynqmpUpgrade linux-image-virtual-hwe-20.04Upgrade linux-image-5.15.0-1072-gcpUpgrade linux-image-azure | 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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