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"text":"In the Linux kernel, the following vulnerability has been resolved:\n\nrcu-tasks: Fix access non-existent percpu rtpcp variable in rcu_tasks_need_gpcb()\n\nFor kernels built with CONFIG_FORCE_NR_CPUS=y, the nr_cpu_ids is\ndefined as NR_CPUS instead of the number of possible cpus, this\nwill cause the following system panic:\n\nsmpboot: Allowing 4 CPUs, 0 hotplug CPUs\n...\nsetup_percpu: NR_CPUS:512 nr_cpumask_bits:512 nr_cpu_ids:512 nr_node_ids:1\n...\nBUG: unable to handle page fault for address: ffffffff9911c8c8\nOops: 0000 [#1] PREEMPT SMP PTI\nCPU: 0 PID: 15 Comm: rcu_tasks_trace Tainted: G W\n6.6.21 #1 5dc7acf91a5e8e9ac9dcfc35bee0245691283ea6\nRIP: 0010:rcu_tasks_need_gpcb+0x25d/0x2c0\nRSP: 0018:ffffa371c00a3e60 EFLAGS: 00010082\nCR2: ffffffff9911c8c8 CR3: 000000040fa20005 CR4: 00000000001706f0\nCall Trace:\n\n? __die+0x23/0x80\n? page_fault_oops+0xa4/0x180\n? exc_page_fault+0x152/0x180\n? asm_exc_page_fault+0x26/0x40\n? rcu_tasks_need_gpcb+0x25d/0x2c0\n? __pfx_rcu_tasks_kthread+0x40/0x40\nrcu_tasks_one_gp+0x69/0x180\nrcu_tasks_kthread+0x94/0xc0\nkthread+0xe8/0x140\n? __pfx_kthread+0x40/0x40\nret_from_fork+0x34/0x80\n? __pfx_kthread+0x40/0x40\nret_from_fork_asm+0x1b/0x80\n\n\nConsidering that there may be holes in the CPU numbers, use the\nmaximum possible cpu number, instead of nr_cpu_ids, for configuring\nenqueue and dequeue limits.\n\n[ neeraj.upadhyay: Fix htmldocs build error reported by Stephen Rothwell ]",
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"text":"In the Linux kernel, the following vulnerability has been resolved:\n\nrcu-tasks: Fix access non-existent percpu rtpcp variable in rcu_tasks_need_gpcb()\n\nFor kernels built with CONFIG_FORCE_NR_CPUS=y, the nr_cpu_ids is\ndefined as NR_CPUS instead of the number of possible cpus, this\nwill cause the following system panic:\n\nsmpboot: Allowing 4 CPUs, 0 hotplug CPUs\n...\nsetup_percpu: NR_CPUS:512 nr_cpumask_bits:512 nr_cpu_ids:512 nr_node_ids:1\n...\nBUG: unable to handle page fault for address: ffffffff9911c8c8\nOops: 0000 [#1] PREEMPT SMP PTI\nCPU: 0 PID: 15 Comm: rcu_tasks_trace Tainted: G W\n6.6.21 #1 5dc7acf91a5e8e9ac9dcfc35bee0245691283ea6\nRIP: 0010:rcu_tasks_need_gpcb+0x25d/0x2c0\nRSP: 0018:ffffa371c00a3e60 EFLAGS: 00010082\nCR2: ffffffff9911c8c8 CR3: 000000040fa20005 CR4: 00000000001706f0\nCall Trace:\n\n? __die+0x23/0x80\n? page_fault_oops+0xa4/0x180\n? exc_page_fault+0x152/0x180\n? asm_exc_page_fault+0x26/0x40\n? rcu_tasks_need_gpcb+0x25d/0x2c0\n? __pfx_rcu_tasks_kthread+0x40/0x40\nrcu_tasks_one_gp+0x69/0x180\nrcu_tasks_kthread+0x94/0xc0\nkthread+0xe8/0x140\n? __pfx_kthread+0x40/0x40\nret_from_fork+0x34/0x80\n? __pfx_kthread+0x40/0x40\nret_from_fork_asm+0x1b/0x80\n\n\nConsidering that there may be holes in the CPU numbers, use the\nmaximum possible cpu number, instead of nr_cpu_ids, for configuring\nenqueue and dequeue limits.\n\n[ neeraj.upadhyay: Fix htmldocs build error reported by Stephen Rothwell ]",
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"title":"Vulnerability Description"
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]
}
],
"threats":[
{
"details":"Medium",
"category":"impact"
}
],
"title":"CVE-2024-49926"
}
]
}