{"id":"DEBIAN-CVE-2023-52831","details":"In the Linux kernel, the following vulnerability has been resolved:  cpu/hotplug: Don't offline the last non-isolated CPU  If a system has isolated CPUs via the \"isolcpus=\" command line parameter, then an attempt to offline the last housekeeping CPU will result in a WARN_ON() when rebuilding the scheduler domains and a subsequent panic due to and unhandled empty CPU mas in partition_sched_domains_locked().  cpuset_hotplug_workfn()   rebuild_sched_domains_locked()     ndoms = generate_sched_domains(&doms, &attr);       cpumask_and(doms[0], top_cpuset.effective_cpus, housekeeping_cpumask(HK_FLAG_DOMAIN));  Thus results in an empty CPU mask which triggers the warning and then the subsequent crash:  WARNING: CPU: 4 PID: 80 at kernel/sched/topology.c:2366 build_sched_domains+0x120c/0x1408 Call trace:  build_sched_domains+0x120c/0x1408  partition_sched_domains_locked+0x234/0x880  rebuild_sched_domains_locked+0x37c/0x798  rebuild_sched_domains+0x30/0x58  cpuset_hotplug_workfn+0x2a8/0x930  Unable to handle kernel paging request at virtual address fffe80027ab37080  partition_sched_domains_locked+0x318/0x880  rebuild_sched_domains_locked+0x37c/0x798  Aside of the resulting crash, it does not make any sense to offline the last last housekeeping CPU.  Prevent this by masking out the non-housekeeping CPUs when selecting a target CPU for initiating the CPU unplug operation via the work queue.","modified":"2026-09-15T09:02:51.365580270Z","published":"2024-05-21T16:15:20.743Z","upstream":["CVE-2023-52831"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2023-52831"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.64-1"}]}],"versions":["6.1.27-1","6.1.37-1","6.1.38-1","6.1.38-2","6.1.38-2~bpo11+1","6.1.38-3","6.1.38-4","6.1.38-4~bpo11+1","6.1.52-1","6.1.55-1","6.1.55-1~bpo11+1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-52831.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.5.13-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-52831.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.5.13-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-52831.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}