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-6.8.0-1024-oemUpgrade linux-image-5.15.0-1071-oracleUpgrade linux-image-6.8.0-1019-raspiUpgrade linux-image-lowlatency-hwe-22.04Upgrade linux-image-intelUpgrade linux-image-xilinx-zynqmpUpgrade linux-image-generic-64k-hwe-22.04Upgrade linux-image-6.8.0-1020-oracle-64kUpgrade linux-image-5.15.0-1073-awsUpgrade linux-image-oem-22.04dUpgrade linux-image-oracleUpgrade linux-image-5.15.0-1070-kvmUpgrade linux-image-6.8.0-1025-azureUpgrade linux-image-6.8.0-1023-awsUpgrade linux-image-generic-hwe-20.04Upgrade linux-image-6.11.0-18-generic-64kUpgrade linux-image-gkeUpgrade linux-image-lowlatency-64k-hwe-22.04Upgrade linux-image-azure-cvmUpgrade linux-image-gcp-lts-22.04Upgrade linux-image-6.8.0-57-genericUpgrade linux-image-oem-22.04Upgrade linux-image-6.11.0-1009-awsUpgrade linux-image-raspiUpgrade linux-image-oracle-lts-22.04Upgrade linux-image-raspi-nolpaeUpgrade linux-image-5.15.0-1039-xilinx-zynqmpUpgrade linux-image-6.8.0-1020-oracleUpgrade linux-image-6.11.0-18-genericUpgrade linux-image-generic-lpae-hwe-20.04Upgrade linux-image-5.15.0-127-generic-lpaeUpgrade linux-image-gkeopUpgrade linux-image-lowlatency-64kUpgrade linux-image-5.15.0-1056-gkeopUpgrade linux-image-6.11.0-1010-lowlatency-64kUpgrade linux-image-gcp-lts-24.04Upgrade linux-image-oem-20.04Upgrade linux-image-nvidia-6.8Upgrade linux-image-azureUpgrade linux-image-nvidia-hwe-22.04Upgrade linux-image-realtimeUpgrade linux-image-virtual-hwe-20.04Upgrade linux-image-gcp-64k-lts-24.04Upgrade linux-image-lowlatency-64k-hwe-20.04Upgrade linux-image-oracle-lts-24.04Upgrade linux-image-genericUpgrade linux-image-gkeop-5.15Upgrade linux-image-5.15.0-1078-azureUpgrade linux-image-5.15.0-1072-gcpUpgrade linux-image-6.11.0-1008-raspiUpgrade linux-image-azure-lts-22.04Upgrade linux-image-gcp-64kUpgrade linux-image-nvidia-lowlatency-64kUpgrade linux-image-aws-lts-24.04Upgrade linux-image-6.11.0-1015-oemUpgrade linux-image-6.8.0-1022-nvidia-lowlatencyUpgrade linux-image-5.15.0-127-genericUpgrade linux-image-oem-24.04Upgrade linux-image-5.15.0-1071-intel-iotgUpgrade linux-image-intel-iotgUpgrade linux-image-5.15.0-1066-ibmUpgrade linux-image-generic-64kUpgrade linux-image-6.8.0-54-genericUpgrade linux-image-6.11.0-1011-oracle-64kUpgrade linux-image-nvidiaUpgrade linux-image-nvidia-64k-6.8Upgrade linux-image-oem-22.04cUpgrade linux-image-6.11.0-1009-azureUpgrade linux-image-azure-lts-24.04Upgrade linux-image-6.11.0-1011-oracleUpgrade linux-image-aws-lts-22.04Upgrade linux-image-5.15.0-1068-nvidia-lowlatencyUpgrade linux-image-virtual-hwe-22.04Upgrade linux-image-virtualUpgrade linux-image-ibmUpgrade linux-image-lowlatency-hwe-20.04Upgrade linux-image-oracle-64k-lts-24.04Upgrade linux-image-ibm-lts-24.04Upgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-oem-20.04cUpgrade linux-image-6.8.0-1022-nvidia-lowlatency-64kUpgrade linux-image-6.8.0-1022-nvidia-64kUpgrade linux-image-generic-hwe-22.04Upgrade linux-image-oracle-64kUpgrade linux-image-gkeop-6.8Upgrade linux-image-nvidia-64kUpgrade linux-image-6.8.0-1022-ibmUpgrade linux-image-6.8.0-1006-gkeopUpgrade linux-image-5.15.0-127-generic-64kUpgrade linux-image-6.11.0-1009-azure-fdeUpgrade linux-image-realtime-hwe-24.04Upgrade linux-image-5.15.0-1068-nvidiaUpgrade linux-image-nvidia-64k-hwe-22.04Upgrade linux-image-6.11.0-1009-gcpUpgrade linux-image-6.8.0-1014-azure-nvidiaUpgrade linux-image-azure-fde-lts-24.04Upgrade linux-image-6.8.0-1024-gcpUpgrade linux-image-generic-64k-hwe-20.04Upgrade linux-image-oem-20.04dUpgrade linux-image-oem-24.04aUpgrade linux-image-6.8.0-1025-azure-fdeUpgrade linux-image-6.11.0-1005-realtimeUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-ibm-classicUpgrade linux-image-oem-22.04bUpgrade linux-image-5.15.0-1066-raspiUpgrade linux-image-oem-24.04bUpgrade linux-image-nvidia-lowlatencyUpgrade linux-image-kvmUpgrade linux-image-5.15.0-1070-gkeUpgrade linux-image-oem-20.04bUpgrade linux-image-6.8.0-1022-nvidiaUpgrade linux-image-6.8.0-1024-gcp-64kUpgrade linux-image-6.8.0-54-lowlatency-64kUpgrade linux-image-azure-nvidiaUpgrade linux-image-lowlatencyUpgrade linux-image-6.8.0-54-lowlatencyUpgrade linux-image-5.15.0-127-lowlatency-64kUpgrade linux-image-gcpUpgrade linux-image-awsUpgrade linux-image-azure-fdeUpgrade linux-image-6.8.0-1019-gkeUpgrade linux-image-6.8.0-54-generic-64kUpgrade linux-image-5.15.0-127-lowlatencyUpgrade linux-image-6.8.0-57-generic-64kUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-gke-5.15Upgrade linux-image-6.11.0-1010-lowlatencyUpgrade linux-image-oem-22.04aUpgrade linux-image-generic-lpae | 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 |
Prioritise with Active Threat Intelligence
With curated Threat Intelligence, you can see which vulnerabilities truly put you at risk, prioritize what matters most, and act before attackers do.
Explore Intelligence Hub