cve-2024-49926
Vulnerability from cvelistv5
Published
2024-10-21 18:01
Modified
2025-01-24 16:01
Severity ?
Summary
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 ]
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/05095271a4fb0f6497121a057f9a2edf386d5d96Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3104bddc666ff64b90491868bbc4c7ebdd90aedfPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b3b2431ed27f4ebc28e26cdf005c1de42dc60bdfPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fd70e9f1d85f5323096ad313ba73f5fe3d15ea41Patch
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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          "value": "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\u003cTASK\u003e\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\u003c/TASK\u003e\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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        },
        {
          "url": "https://git.kernel.org/stable/c/fd70e9f1d85f5323096ad313ba73f5fe3d15ea41"
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      "title": "rcu-tasks: Fix access non-existent percpu rtpcp variable in rcu_tasks_need_gpcb()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2024-49926",
    "datePublished": "2024-10-21T18:01:50.405Z",
    "dateReserved": "2024-10-21T12:17:06.038Z",
    "dateUpdated": "2025-01-24T16:01:33.369Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2024-49926\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-10-21T18:15:14.623\",\"lastModified\":\"2025-01-24T16:15:37.237\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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\u003cTASK\u003e\\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\u003c/TASK\u003e\\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 ]\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: rcu-tasks: Se corrige el acceso a la variable rtpcp percpu inexistente en rcu_tasks_need_gpcb() Para kernels creados con CONFIG_FORCE_NR_CPUS=y, nr_cpu_ids se define como NR_CPUS en lugar del n\u00famero de CPU posibles, esto provocar\u00e1 el siguiente p\u00e1nico del sistema: smpboot: Permitiendo 4 CPU, 0 CPU hotplug ... setup_percpu: NR_CPUS:512 nr_cpumask_bits:512 nr_cpu_ids:512 nr_node_ids:1 ... ERROR: no se puede manejar el error de p\u00e1gina para la direcci\u00f3n: ffffffff9911c8c8 Oops: 0000 [#1] PREEMPT SMP PTI CPU: 0 PID: 15 Comm: rcu_tasks_trace Tainted: GW 6.6.21 #1 5dc7acf91a5e8e9ac9dcfc35bee0245691283ea6 RIP: 0010:rcu_tasks_need_gpcb+0x25d/0x2c0 RSP: 0018:ffffa371c00a3e60 EFLAGS: 00010082 CR2: ffffffff9911c8c8 CR3: 000000040fa20005 CR4: 00000000001706f0 Rastreo de llamadas:  ? __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  Teniendo en cuenta que puede haber agujeros en los n\u00fameros de CPU, utilice el n\u00famero m\u00e1ximo posible de CPU, en lugar de nr_cpu_ids, para configurar los l\u00edmites de encolado y desencolado. 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    "vulnrichment": {
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      "dataType": "CVE_RECORD",
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}


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