In the Linux kernel, the following vulnerability has been resolved:
rcu-tasks: Fix access non-existent percpu rtpcp variable in rcu_tasks_need_gpcb()
For kernels built with CONFIG_FORCE_NR_CPUS=y, the nr_cpu_ids is defined as NR_CPUS instead of the number of possible cpus, this will cause the following system panic:
smpboot: Allowing 4 CPUs, 0 hotplug CPUs ... setup_percpu: NR_CPUS:512 nr_cpumask_bits:512 nr_cpu_ids:512 nr_node_ids:1 ... BUG: unable to handle page fault for address: ffffffff9911c8c8 Oops: 0000 [#1] PREEMPT SMP PTI CPU: 0 PID: 15 Comm: rcu_tasks_trace Tainted: G W 6.6.21 #1 5dc7acf91a5e8e9ac9dcfc35bee0245691283ea6 RIP: 0010:rcu_tasks_need_gpcb+0x25d/0x2c0 RSP: 0018:ffffa371c00a3e60 EFLAGS: 00010082 CR2: ffffffff9911c8c8 CR3: 000000040fa20005 CR4: 00000000001706f0 Call Trace: <TASK> ? __die+0x23/0x80 ? page_fault_oops+0xa4/0x180 ? exc_page_fault+0x152/0x180 ? asm_exc_page_fault+0x26/0x40 ? rcu_tasks_need_gpcb+0x25d/0x2c0 ? __pfx_rcu_tasks_kthread+0x40/0x40 rcu_tasks_one_gp+0x69/0x180 rcu_tasks_kthread+0x94/0xc0 kthread+0xe8/0x140 ? __pfx_kthread+0x40/0x40 ret_from_fork+0x34/0x80 ? __pfx_kthread+0x40/0x40 ret_from_fork_asm+0x1b/0x80 </TASK>
Considering that there may be holes in the CPU numbers, use the maximum possible cpu number, instead of nr_cpu_ids, for configuring enqueue and dequeue limits.
[ neeraj.upadhyay: Fix htmldocs build error reported by Stephen Rothwell ]
CVSS Details
- CVSS 3.1 Base Score: 5.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade kernel-toolsUpgrade bpftool-debuginfoUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-debuginfo-common-x86_64Upgrade kernel-modules-extra-commonUpgrade perf-debuginfoUpgrade bpftoolUpgrade kernel-modules-extraUpgrade kernel-livepatch-6.1.124-134.200Upgrade python3-perf-debuginfoUpgrade kernel-tools-develUpgrade kernel-libbpf-develUpgrade kernel-libbpfUpgrade kernel-headersUpgrade python3-perfUpgrade kernelUpgrade kernel-debuginfoUpgrade perfUpgrade kernel-tools-debuginfoUpgrade kernel-libbpf-staticUpgrade kernel-devel | Feb 17, 2025 | Oct 21, 2024 |
| Debian | — | Upgrade linux | May 15, 2025 | Oct 21, 2024 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Oct 21, 2024 |
| Ubuntu | — | Upgrade linux-image-6.11.0-1010-lowlatencyUpgrade linux-image-6.8.0-1025-azureUpgrade linux-image-6.8.0-57-genericUpgrade linux-image-oem-22.04dUpgrade linux-image-gcp-lts-24.04Upgrade linux-image-6.11.0-18-genericUpgrade linux-image-nvidia-6.8Upgrade linux-image-azureUpgrade linux-image-6.8.0-1014-azure-nvidiaUpgrade linux-image-6.8.0-1022-nvidia-64kUpgrade linux-image-gcp-64kUpgrade linux-image-6.11.0-18-generic-64kUpgrade linux-image-6.8.0-1019-raspiUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-6.8.0-1022-ibmUpgrade linux-image-6.11.0-1008-raspiUpgrade linux-image-raspiUpgrade linux-image-6.11.0-1010-lowlatency-64kUpgrade linux-image-realtimeUpgrade linux-image-virtual-hwe-22.04Upgrade linux-image-generic-64k-hwe-22.04Upgrade linux-image-6.8.0-1020-oracle-64kUpgrade linux-image-6.11.0-1015-oemUpgrade linux-image-oracle-64k-lts-24.04Upgrade linux-image-nvidia-hwe-22.04Upgrade linux-image-generic-hwe-22.04Upgrade linux-image-aws-lts-24.04Upgrade linux-image-6.8.0-1019-gkeUpgrade linux-image-realtime-hwe-24.04Upgrade linux-image-nvidia-lowlatencyUpgrade linux-image-awsUpgrade linux-image-6.8.0-54-lowlatencyUpgrade linux-image-kvmUpgrade linux-image-oem-22.04cUpgrade linux-image-6.8.0-1023-awsUpgrade linux-image-oem-24.04Upgrade linux-image-nvidia-64kUpgrade linux-image-6.8.0-1020-oracleUpgrade linux-image-6.8.0-1025-azure-fdeUpgrade linux-image-6.11.0-1009-awsUpgrade linux-image-gkeUpgrade linux-image-nvidia-64k-6.8Upgrade linux-image-oem-24.04aUpgrade linux-image-6.8.0-1022-nvidia-lowlatencyUpgrade linux-image-6.8.0-1024-gcpUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-lowlatency-hwe-22.04Upgrade linux-image-ibm-lts-24.04Upgrade linux-image-6.8.0-57-generic-64kUpgrade linux-image-6.11.0-1009-azureUpgrade linux-image-oracleUpgrade linux-image-6.8.0-54-lowlatency-64kUpgrade linux-image-genericUpgrade linux-image-6.8.0-1024-oemUpgrade linux-image-oem-22.04Upgrade linux-image-6.8.0-1024-gcp-64kUpgrade linux-image-ibm-classicUpgrade linux-image-6.11.0-1009-azure-fdeUpgrade linux-image-6.8.0-1022-nvidiaUpgrade linux-image-oem-24.04bUpgrade linux-image-azure-fdeUpgrade linux-image-oracle-64kUpgrade linux-image-virtualUpgrade linux-image-6.8.0-54-generic-64kUpgrade linux-image-generic-lpaeUpgrade linux-image-nvidia-64k-hwe-22.04Upgrade linux-image-oracle-lts-24.04Upgrade linux-image-oem-22.04bUpgrade linux-image-nvidia-lowlatency-64kUpgrade linux-image-ibmUpgrade linux-image-nvidiaUpgrade linux-image-6.8.0-1006-gkeopUpgrade linux-image-lowlatency-64k-hwe-22.04Upgrade linux-image-azure-fde-lts-24.04Upgrade linux-image-gkeopUpgrade linux-image-oem-22.04aUpgrade linux-image-lowlatencyUpgrade linux-image-azure-lts-24.04Upgrade linux-image-6.11.0-1009-gcpUpgrade linux-image-lowlatency-64kUpgrade linux-image-6.11.0-1011-oracle-64kUpgrade linux-image-generic-64kUpgrade linux-image-gcpUpgrade linux-image-azure-nvidiaUpgrade linux-image-6.8.0-54-genericUpgrade linux-image-6.8.0-1022-nvidia-lowlatency-64kUpgrade linux-image-6.11.0-1005-realtimeUpgrade linux-image-6.11.0-1011-oracleUpgrade linux-image-gcp-64k-lts-24.04Upgrade linux-image-gkeop-6.8Upgrade linux-image-generic-64k-hwe-24.04 | Feb 20, 2025 | Oct 21, 2024 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Sep 22, 2025 | Oct 21, 2024 |
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