{"id":"CVE-2023-52831","state":"PUBLISHED","title":"cpu/hotplug: Don't offline the last non-isolated CPU","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ncpu/hotplug: Don't offline the last non-isolated CPU\n\nIf a system has isolated CPUs via the \"isolcpus=\" command line parameter,\nthen an attempt to offline the last housekeeping CPU will result in a\nWARN_ON() when rebuilding the scheduler domains and a subsequent panic due\nto and unhandled empty CPU mas in partition_sched_domains_locked().\n\ncpuset_hotplug_workfn()\n  rebuild_sched_domains_locked()\n    ndoms = generate_sched_domains(&doms, &attr);\n      cpumask_and(doms[0], top_cpuset.effective_cpus, housekeeping_cpumask(HK_FLAG_DOMAIN));\n\nThus results in an empty CPU mask which triggers the warning and then the\nsubsequent crash:\n\nWARNING: CPU: 4 PID: 80 at kernel/sched/topology.c:2366 build_sched_domains+0x120c/0x1408\nCall trace:\n build_sched_domains+0x120c/0x1408\n partition_sched_domains_locked+0x234/0x880\n rebuild_sched_domains_locked+0x37c/0x798\n rebuild_sched_domains+0x30/0x58\n cpuset_hotplug_workfn+0x2a8/0x930\n\nUnable to handle kernel paging request at virtual address fffe80027ab37080\n partition_sched_domains_locked+0x318/0x880\n rebuild_sched_domains_locked+0x37c/0x798\n\nAside of the resulting crash, it does not make any sense to offline the last\nlast housekeeping CPU.\n\nPrevent this by masking out the non-housekeeping CPUs when selecting a\ntarget CPU for initiating the CPU unplug operation via the work queue.","publishedAt":"2024-05-21T15:31:33.566Z","updatedAt":"2026-05-23T15:27:14.150Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"fea9dd8653ff39ce383c54e747bde4c39289b4ad","status":"affected","lessThan":"3410b702354702b500bde10e3cc1f9db8731d908","versionType":"git"},{"version":"07f9e0c9987bf1c4ef57611ad2f789ba68978102","status":"affected","lessThan":"335a47ed71e332c82339d1aec0c7f6caccfcda13","versionType":"git"},{"version":"2b8272ff4a70b866106ae13c36be7ecbef5d5da2","status":"affected","lessThan":"3073f6df783d9d75f7f69f73e16c7ef85d6cfb63","versionType":"git"},{"version":"2b8272ff4a70b866106ae13c36be7ecbef5d5da2","status":"affected","lessThan":"38685e2a0476127db766f81b1c06019ddc4c9ffa","versionType":"git"},{"version":"9734e4c0c470258c32b6aa5ea7ef8a86506c0909","status":"affected","versionType":"git"},{"version":"6.1.53","status":"affected","lessThan":"6.1.64","versionType":"semver"},{"version":"6.5.3","status":"affected","lessThan":"6.5.13","versionType":"semver"},{"version":"6.4.16","status":"affected","lessThan":"6.5","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/cpu.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.6","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.6","versionType":"semver"},{"version":"6.1.64","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.5.13","status":"unaffected","lessThanOrEqual":"6.5.*","versionType":"semver"},{"version":"6.6.3","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.7","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/cpu.c"]}],"references":["https://git.kernel.org/stable/c/3410b702354702b500bde10e3cc1f9db8731d908","https://git.kernel.org/stable/c/335a47ed71e332c82339d1aec0c7f6caccfcda13","https://git.kernel.org/stable/c/3073f6df783d9d75f7f69f73e16c7ef85d6cfb63","https://git.kernel.org/stable/c/38685e2a0476127db766f81b1c06019ddc4c9ffa"],"weaknesses":[],"ingestedAt":"2026-10-29T20:06:33.064Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2023/52xxx/CVE-2023-52831.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2023-52831","state":"PUBLISHED","datePublished":"2024-05-21T15:31:33.566Z","dateUpdated":"2026-05-23T15:27:14.150Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-05-21T15:19:24.251Z"},"containers":{"cna":{"title":"cpu/hotplug: Don't offline the last non-isolated CPU","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ncpu/hotplug: Don't offline the last non-isolated CPU\n\nIf a system has isolated CPUs via the \"isolcpus=\" command line parameter,\nthen an attempt to offline the last housekeeping CPU will result in a\nWARN_ON() when rebuilding the scheduler domains and a subsequent panic due\nto and unhandled empty CPU mas in partition_sched_domains_locked().\n\ncpuset_hotplug_workfn()\n  rebuild_sched_domains_locked()\n    ndoms = generate_sched_domains(&doms, &attr);\n      cpumask_and(doms[0], top_cpuset.effective_cpus, housekeeping_cpumask(HK_FLAG_DOMAIN));\n\nThus results in an empty CPU mask which triggers the warning and then the\nsubsequent crash:\n\nWARNING: CPU: 4 PID: 80 at kernel/sched/topology.c:2366 build_sched_domains+0x120c/0x1408\nCall trace:\n build_sched_domains+0x120c/0x1408\n partition_sched_domains_locked+0x234/0x880\n rebuild_sched_domains_locked+0x37c/0x798\n rebuild_sched_domains+0x30/0x58\n cpuset_hotplug_workfn+0x2a8/0x930\n\nUnable to handle kernel paging request at virtual address fffe80027ab37080\n partition_sched_domains_locked+0x318/0x880\n rebuild_sched_domains_locked+0x37c/0x798\n\nAside of the resulting crash, it does not make any sense to offline the last\nlast housekeeping CPU.\n\nPrevent this by masking out the non-housekeeping CPUs when selecting a\ntarget CPU for initiating the CPU unplug operation via the work queue."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"fea9dd8653ff39ce383c54e747bde4c39289b4ad","status":"affected","lessThan":"3410b702354702b500bde10e3cc1f9db8731d908","versionType":"git"},{"version":"07f9e0c9987bf1c4ef57611ad2f789ba68978102","status":"affected","lessThan":"335a47ed71e332c82339d1aec0c7f6caccfcda13","versionType":"git"},{"version":"2b8272ff4a70b866106ae13c36be7ecbef5d5da2","status":"affected","lessThan":"3073f6df783d9d75f7f69f73e16c7ef85d6cfb63","versionType":"git"},{"version":"2b8272ff4a70b866106ae13c36be7ecbef5d5da2","status":"affected","lessThan":"38685e2a0476127db766f81b1c06019ddc4c9ffa","versionType":"git"},{"version":"9734e4c0c470258c32b6aa5ea7ef8a86506c0909","status":"affected","versionType":"git"},{"version":"6.1.53","status":"affected","lessThan":"6.1.64","versionType":"semver"},{"version":"6.5.3","status":"affected","lessThan":"6.5.13","versionType":"semver"},{"version":"6.4.16","status":"affected","lessThan":"6.5","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/cpu.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.6","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.6","versionType":"semver"},{"version":"6.1.64","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.5.13","status":"unaffected","lessThanOrEqual":"6.5.*","versionType":"semver"},{"version":"6.6.3","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.7","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/cpu.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/3410b702354702b500bde10e3cc1f9db8731d908"},{"url":"https://git.kernel.org/stable/c/335a47ed71e332c82339d1aec0c7f6caccfcda13"},{"url":"https://git.kernel.org/stable/c/3073f6df783d9d75f7f69f73e16c7ef85d6cfb63"},{"url":"https://git.kernel.org/stable/c/38685e2a0476127db766f81b1c06019ddc4c9ffa"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-23T15:27:14.150Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.53","versionEndExcluding":"6.1.64"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.5.3","versionEndExcluding":"6.5.13"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"6.6.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"6.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.4.16"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA 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