{"id":"CVE-2024-49926","revision":"fe93d31f464c4dbebecde19a4c29c466","records":[{"revision":"fe93d31f464c4dbebecde19a4c29c466","observedAt":"2026-10-30T13:45:33.454+00:00","statement":{"source":"cve-program","id":"CVE-2024-49926","aliases":[],"title":"rcu-tasks: Fix access non-existent percpu rtpcp variable in rcu_tasks_need_gpcb()","description":"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<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 ]","state":0,"publishedAt":"2024-10-21T18:01:50.405+00:00","modifiedAt":"2026-10-30T12:19:43.73+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"kernel/rcu/tasks.h\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"8610b65680390a103b58f46282a1b05f7eebbba4\",\n                            \"lessThan\": \"a89f6e90e64ecadd19f32bb8128d22b518bd656c\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8610b65680390a103b58f46282a1b05f7eebbba4\",\n                            \"lessThan\": \"b3b2431ed27f4ebc28e26cdf005c1de42dc60bdf\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8610b65680390a103b58f46282a1b05f7eebbba4\",\n                            \"lessThan\": \"3104bddc666ff64b90491868bbc4c7ebdd90aedf\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8610b65680390a103b58f46282a1b05f7eebbba4\",\n                            \"lessThan\": \"05095271a4fb0f6497121a057f9a2edf386d5d96\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8610b65680390a103b58f46282a1b05f7eebbba4\",\n                            \"lessThan\": \"fd70e9f1d85f5323096ad313ba73f5fe3d15ea41\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"kernel/rcu/tasks.h\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.17\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.17\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.191\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.60\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.10.14\",\n                            \"lessThanOrEqual\": \"6.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.11.3\",\n                            \"lessThanOrEqual\": \"6.11.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/a89f6e90e64ecadd19f32bb8128d22b518bd656c","https://git.kernel.org/stable/c/b3b2431ed27f4ebc28e26cdf005c1de42dc60bdf","https://git.kernel.org/stable/c/3104bddc666ff64b90491868bbc4c7ebdd90aedf","https://git.kernel.org/stable/c/05095271a4fb0f6497121a057f9a2edf386d5d96","https://git.kernel.org/stable/c/fd70e9f1d85f5323096ad313ba73f5fe3d15ea41"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2024-49926","license":"CVE Program Terms of Use","key":"cve-program:CVE-2024-49926","identifiers":["CVE-2024-49926"]},"retained":false,"historicalAffected":[]}],"coverage":[]}