{"id":"CVE-2024-49926","title":"rcu-tasks: Fix access non-existent percpu rtpcp variable in rcu_tasks_need_gpcb()","summary":"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 i…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 8610b65680390a103b58f46282a1b05f7eebbba4 < a89f6e90e64ecadd19f32bb8128d22b518bd656c","Linux >= 8610b65680390a103b58f46282a1b05f7eebbba4 < b3b2431ed27f4ebc28e26cdf005c1de42dc60bdf","Linux >= 8610b65680390a103b58f46282a1b05f7eebbba4 < 3104bddc666ff64b90491868bbc4c7ebdd90aedf","Linux >= 8610b65680390a103b58f46282a1b05f7eebbba4 < 05095271a4fb0f6497121a057f9a2edf386d5d96","Linux >= 8610b65680390a103b58f46282a1b05f7eebbba4 < fd70e9f1d85f5323096ad313ba73f5fe3d15ea41","Linux 5.17"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2024-10-22T13:39:42.362013Z"},"published":"2024-10-21","updated":"2026-10-30","sourceUpdated":"2026-10-30T12:19:43.730Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2024-49926","references":[{"url":"https://git.kernel.org/stable/c/a89f6e90e64ecadd19f32bb8128d22b518bd656c"},{"url":"https://git.kernel.org/stable/c/b3b2431ed27f4ebc28e26cdf005c1de42dc60bdf"},{"url":"https://git.kernel.org/stable/c/3104bddc666ff64b90491868bbc4c7ebdd90aedf"},{"url":"https://git.kernel.org/stable/c/05095271a4fb0f6497121a057f9a2edf386d5d96"},{"url":"https://git.kernel.org/stable/c/fd70e9f1d85f5323096ad313ba73f5fe3d15ea41"}],"tags":["cve.org"],"epss":0.00235,"epssPercentile":0.14493,"ingestedAt":"2026-11-03T14:47:02.508Z","slug":"CVE-2024-49926","body":"## Overview\n\nIn 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<TASK>\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</TASK>\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 ]\n\n## Affected\n\n- `Linux >= 8610b65680390a103b58f46282a1b05f7eebbba4 < a89f6e90e64ecadd19f32bb8128d22b518bd656c`\n- `Linux >= 8610b65680390a103b58f46282a1b05f7eebbba4 < b3b2431ed27f4ebc28e26cdf005c1de42dc60bdf`\n- `Linux >= 8610b65680390a103b58f46282a1b05f7eebbba4 < 3104bddc666ff64b90491868bbc4c7ebdd90aedf`\n- `Linux >= 8610b65680390a103b58f46282a1b05f7eebbba4 < 05095271a4fb0f6497121a057f9a2edf386d5d96`\n- `Linux >= 8610b65680390a103b58f46282a1b05f7eebbba4 < fd70e9f1d85f5323096ad313ba73f5fe3d15ea41`\n- `Linux 5.17`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}