{"id":"CVE-2026-72067","state":"PUBLISHED","title":"cpu: hotplug: Preserve per instance callback errors","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ncpu: hotplug: Preserve per instance callback errors\n\ncpuhp_invoke_callback() unwinds earlier callbacks for the same\nhotplug state when one instance fails. The rollback path currently\nreuses ret, so a successful rollback can hide the original error and\nmake the failed transition look successful.\n\nKeep the rollback result separate from the original error.","publishedAt":"2026-08-15T05:52:20.268Z","updatedAt":"2026-10-19T21:19:26.303Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"724a86881d03ee5794148e65142e24ed3621be66","status":"affected","lessThan":"fe9c8d641f6991614d1229a3ffd3e33b879bba9c","versionType":"git"},{"version":"724a86881d03ee5794148e65142e24ed3621be66","status":"affected","lessThan":"ef39758637cc5b603fb05b625c45a98aa306e338","versionType":"git"},{"version":"724a86881d03ee5794148e65142e24ed3621be66","status":"affected","lessThan":"95232281512b15338549171ed9a2acf21f946ffb","versionType":"git"},{"version":"724a86881d03ee5794148e65142e24ed3621be66","status":"affected","lessThan":"7a68257b90d8a9b6d605abc99469ded45ecba63b","versionType":"git"},{"version":"724a86881d03ee5794148e65142e24ed3621be66","status":"affected","lessThan":"77d4fa8a3ea1c3e8b996ac35e59aee9e77389905","versionType":"git"},{"version":"724a86881d03ee5794148e65142e24ed3621be66","status":"affected","lessThan":"f77117530fc3f5932ffb107182a6dd34006be9b6","versionType":"git"},{"version":"724a86881d03ee5794148e65142e24ed3621be66","status":"affected","lessThan":"9f7dc355f62c011e4afe8286cf71130d4bfb9d80","versionType":"git"},{"version":"724a86881d03ee5794148e65142e24ed3621be66","status":"affected","lessThan":"673db10729fb121ea1b16fe57791a0cb9eac1eb5","versionType":"git"}],"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":"4.14","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.14","versionType":"semver"},{"version":"5.10.261","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.212","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.97","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.40","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","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/fe9c8d641f6991614d1229a3ffd3e33b879bba9c","https://git.kernel.org/stable/c/ef39758637cc5b603fb05b625c45a98aa306e338","https://git.kernel.org/stable/c/95232281512b15338549171ed9a2acf21f946ffb","https://git.kernel.org/stable/c/7a68257b90d8a9b6d605abc99469ded45ecba63b","https://git.kernel.org/stable/c/77d4fa8a3ea1c3e8b996ac35e59aee9e77389905","https://git.kernel.org/stable/c/f77117530fc3f5932ffb107182a6dd34006be9b6","https://git.kernel.org/stable/c/9f7dc355f62c011e4afe8286cf71130d4bfb9d80","https://git.kernel.org/stable/c/673db10729fb121ea1b16fe57791a0cb9eac1eb5"],"weaknesses":["CWE-754"],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/72xxx/CVE-2026-72067.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-72067","state":"PUBLISHED","datePublished":"2026-08-15T05:52:20.268Z","dateUpdated":"2026-10-19T21:19:26.303Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-09T03:40:39.903Z"},"containers":{"cna":{"title":"cpu: hotplug: Preserve per instance callback errors","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ncpu: hotplug: Preserve per instance callback errors\n\ncpuhp_invoke_callback() unwinds earlier callbacks for the same\nhotplug state when one instance fails. The rollback path currently\nreuses ret, so a successful rollback can hide the original error and\nmake the failed transition look successful.\n\nKeep the rollback result separate from the original error."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"724a86881d03ee5794148e65142e24ed3621be66","status":"affected","lessThan":"fe9c8d641f6991614d1229a3ffd3e33b879bba9c","versionType":"git"},{"version":"724a86881d03ee5794148e65142e24ed3621be66","status":"affected","lessThan":"ef39758637cc5b603fb05b625c45a98aa306e338","versionType":"git"},{"version":"724a86881d03ee5794148e65142e24ed3621be66","status":"affected","lessThan":"95232281512b15338549171ed9a2acf21f946ffb","versionType":"git"},{"version":"724a86881d03ee5794148e65142e24ed3621be66","status":"affected","lessThan":"7a68257b90d8a9b6d605abc99469ded45ecba63b","versionType":"git"},{"version":"724a86881d03ee5794148e65142e24ed3621be66","status":"affected","lessThan":"77d4fa8a3ea1c3e8b996ac35e59aee9e77389905","versionType":"git"},{"version":"724a86881d03ee5794148e65142e24ed3621be66","status":"affected","lessThan":"f77117530fc3f5932ffb107182a6dd34006be9b6","versionType":"git"},{"version":"724a86881d03ee5794148e65142e24ed3621be66","status":"affected","lessThan":"9f7dc355f62c011e4afe8286cf71130d4bfb9d80","versionType":"git"},{"version":"724a86881d03ee5794148e65142e24ed3621be66","status":"affected","lessThan":"673db10729fb121ea1b16fe57791a0cb9eac1eb5","versionType":"git"}],"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":"4.14","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.14","versionType":"semver"},{"version":"5.10.261","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.212","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.97","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.40","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","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/fe9c8d641f6991614d1229a3ffd3e33b879bba9c"},{"url":"https://git.kernel.org/stable/c/ef39758637cc5b603fb05b625c45a98aa306e338"},{"url":"https://git.kernel.org/stable/c/95232281512b15338549171ed9a2acf21f946ffb"},{"url":"https://git.kernel.org/stable/c/7a68257b90d8a9b6d605abc99469ded45ecba63b"},{"url":"https://git.kernel.org/stable/c/77d4fa8a3ea1c3e8b996ac35e59aee9e77389905"},{"url":"https://git.kernel.org/stable/c/f77117530fc3f5932ffb107182a6dd34006be9b6"},{"url":"https://git.kernel.org/stable/c/9f7dc355f62c011e4afe8286cf71130d4bfb9d80"},{"url":"https://git.kernel.org/stable/c/673db10729fb121ea1b16fe57791a0cb9eac1eb5"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The bug is in cpuhp_invoke_callback() during CPU hotplug state transitions, reached only via local kernel paths such as sysfs /sys/devices/system/cpu/cpuN/online, device_online/offline, and cpu_up()/cpu_down() from privileged local callers.\nAC:L - An attacker can reliably trigger the bug by inducing multi-instance callback failure (e.g., -ENOMEM via memory pressure) during CPU online/offline on cloud autoscaled nodes or servers running RAID/padata where rollback callbacks succeed and overwrite the original error.\nPR:L - CPU hotplug is normally admin-initiated, but an unprivileged local user can force multi-instance callback failures through memory exhaustion during system/hypervisor CPU hotplug without needing CAP_SYS_ADMIN or user-namespace admin capabilities.\nUI:N - Exploitation requires no victim interaction beyond normal system operation; it is triggered during kernel CPU hotplug transitions without the user opening files, mounting filesystems, or performing other deliberate actions.\nS:U - The vulnerability corrupts kernel CPU hotplug state-machine consistency and affects kernel subsystems on the same host; it does not cross a VM, container, or IOMMU security boundary to impact a separate authority.\nC:H - Silently completing hotplug after a failed multi-instance rollback leaves subsystems like padata and RAID5 in a state inconsistent with the hotplug machine, which can desynchronize RCU-protected structures and enable kernel memory disclosure primitives.\nI:H - When rollback overwrites the original error with success, cpuhp_up_callbacks()/cpuhp_down_callbacks() proceed and mark the CPU transition complete while multi-instance subsystem callbacks were only partially applied, corrupting kernel integrity and enabling further memory corruption.\nA:H - Proceeding past a failed multi-instance hotplug step while subsystems such as padata, RAID5, or virtio-net instances are left in an inconsistent partially-rolled-back state can cause kernel oops, panic, or hang on production cloud and server systems."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-17T05:39:59.754Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14","versionEndExcluding":"5.10.261"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14","versionEndExcluding":"5.15.212"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14","versionEndExcluding":"6.1.178"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14","versionEndExcluding":"6.6.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14","versionEndExcluding":"6.12.97"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14","versionEndExcluding":"6.18.40"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14","versionEndExcluding":"7.1.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-72067","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T15:51:18.639735Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-754","lang":"en","type":"CWE","description":"CWE-754 Improper Check for Unusual or Exceptional Conditions"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-19T21:19:26.303Z"}}]}}}