In the Linux kernel, the following vulnerability has been resolved:
rcu: Fix __this_cpu_read() lockdep warning in rcu_force_quiescent_state()
Running rcutorture with non-zero fqs_duration module parameter in a kernel built with CONFIG_PREEMPTION=y results in the following splat:
BUG: using __this_cpu_read() in preemptible [00000000] code: rcu_torture_fqs/398 caller is __this_cpu_preempt_check+0x13/0x20 CPU: 3 PID: 398 Comm: rcu_torture_fqs Not tainted 6.0.0-rc1-yoctodev-standard+ Call Trace: <TASK> dump_stack_lvl+0x5b/0x86 dump_stack+0x10/0x16 check_preemption_disabled+0xe5/0xf0 __this_cpu_preempt_check+0x13/0x20 rcu_force_quiescent_state.part.0+0x1c/0x170 rcu_force_quiescent_state+0x1e/0x30 rcu_torture_fqs+0xca/0x160 ? rcu_torture_boost+0x430/0x430 kthread+0x192/0x1d0 ? kthread_complete_and_exit+0x30/0x30 ret_from_fork+0x22/0x30 </TASK>
The problem is that rcu_force_quiescent_state() uses __this_cpu_read() in preemptible code instead of the proper raw_cpu_read(). This commit therefore changes __this_cpu_read() to raw_cpu_read().
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade python-perfUpgrade kernel-headersUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-livepatch-5.15.86-53.137Upgrade bpftool-debuginfoUpgrade kernel-tools-debuginfoUpgrade python-perf-debuginfoUpgrade perf-debuginfoUpgrade kernel-debuginfoUpgrade kernel-develUpgrade kernel-tools-develUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-livepatch-5.10.165-143.735Upgrade kernelUpgrade perfUpgrade kernel-toolsUpgrade bpftool | May 20, 2026 | May 20, 2026 |
| Debian | — | Upgrade linux | Dec 29, 2025 | Dec 29, 2025 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Dec 24, 2025 |
| Ubuntu | — | Upgrade linux-gcp-fipsUpgrade linux-aws-fipsUpgrade linux-hwe-5.4Upgrade linux-nvidiaUpgrade linux-kvmUpgrade linux-gkeopUpgrade linuxUpgrade linux-oracleUpgrade linux-azure-fipsUpgrade linux-azure-5.15Upgrade linux-azure-fde-5.15Upgrade linux-ibm-5.4Upgrade linux-riscv-5.15Upgrade linux-ibmUpgrade linux-gcp-5.4Upgrade linux-xilinx-zynqmpUpgrade linux-azure-5.4Upgrade linux-oracle-5.15Upgrade linux-gcpUpgrade linux-intel-iot-realtimeUpgrade linux-lowlatencyUpgrade linux-realtimeUpgrade linux-awsUpgrade linux-raspi-5.4Upgrade linux-intel-iotg-5.15Upgrade linux-oracle-5.4Upgrade linux-bluefieldUpgrade linux-aws-5.15Upgrade linux-azureUpgrade linux-iotUpgrade linux-raspiUpgrade linux-azure-fdeUpgrade linux-nvidia-tegra-5.15Upgrade linux-aws-5.4Upgrade linux-hwe-5.15Upgrade linux-intel-iotgUpgrade linux-gcp-5.15Upgrade linux-gkeUpgrade linux-fipsUpgrade linux-lowlatency-hwe-5.15 | Jan 6, 2026 | Dec 24, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | Dec 24, 2025 |
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