{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-68780","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2025-12-24T10:30:51.036Z","datePublished":"2026-01-13T15:28:55.483Z","dateUpdated":"2026-05-11T21:53:12.601Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T21:53:12.601Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nsched/deadline: only set free_cpus for online runqueues\n\nCommit 16b269436b72 (\"sched/deadline: Modify cpudl::free_cpus\nto reflect rd->online\") introduced the cpudl_set/clear_freecpu\nfunctions to allow the cpu_dl::free_cpus mask to be manipulated\nby the deadline scheduler class rq_on/offline callbacks so the\nmask would also reflect this state.\n\nCommit 9659e1eeee28 (\"sched/deadline: Remove cpu_active_mask\nfrom cpudl_find()\") removed the check of the cpu_active_mask to\nsave some processing on the premise that the cpudl::free_cpus\nmask already reflected the runqueue online state.\n\nUnfortunately, there are cases where it is possible for the\ncpudl_clear function to set the free_cpus bit for a CPU when the\ndeadline runqueue is offline. When this occurs while a CPU is\nconnected to the default root domain the flag may retain the bad\nstate after the CPU has been unplugged. Later, a different CPU\nthat is transitioning through the default root domain may push a\ndeadline task to the powered down CPU when cpudl_find sees its\nfree_cpus bit is set. If this happens the task will not have the\nopportunity to run.\n\nOne example is outlined here:\nhttps://lore.kernel.org/lkml/20250110233010.2339521-1-opendmb@gmail.com\n\nAnother occurs when the last deadline task is migrated from a\nCPU that has an offlined runqueue. The dequeue_task member of\nthe deadline scheduler class will eventually call cpudl_clear\nand set the free_cpus bit for the CPU.\n\nThis commit modifies the cpudl_clear function to be aware of the\nonline state of the deadline runqueue so that the free_cpus mask\ncan be updated appropriately.\n\nIt is no longer necessary to manage the mask outside of the\ncpudl_set/clear functions so the cpudl_set/clear_freecpu\nfunctions are removed. In addition, since the free_cpus mask is\nnow only updated under the cpudl lock the code was changed to\nuse the non-atomic __cpumask functions."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/sched/cpudeadline.c","kernel/sched/cpudeadline.h","kernel/sched/deadline.c"],"versions":[{"version":"9659e1eeee28f7025b6545934d644d19e9c6e603","lessThan":"9019e399684e3cc68c4a3f050e268f74d69c1317","status":"affected","versionType":"git"},{"version":"9659e1eeee28f7025b6545934d644d19e9c6e603","lessThan":"fb36846cbcc936954f2ad2bffdff13d16c0be08a","status":"affected","versionType":"git"},{"version":"9659e1eeee28f7025b6545934d644d19e9c6e603","lessThan":"91e448e69aca4bb0ba2e998eb3e555644db7322b","status":"affected","versionType":"git"},{"version":"9659e1eeee28f7025b6545934d644d19e9c6e603","lessThan":"dbc61834b0412435df21c71410562d933e4eba49","status":"affected","versionType":"git"},{"version":"9659e1eeee28f7025b6545934d644d19e9c6e603","lessThan":"3ed049fbfb4d75b4e0b8ab54c934f485129d5dc8","status":"affected","versionType":"git"},{"version":"9659e1eeee28f7025b6545934d644d19e9c6e603","lessThan":"382748c05e58a9f1935f5a653c352422375566ea","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/sched/cpudeadline.c","kernel/sched/cpudeadline.h","kernel/sched/deadline.c"],"versions":[{"version":"4.0","status":"affected"},{"version":"0","lessThan":"4.0","status":"unaffected","versionType":"semver"},{"version":"5.15.198","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.160","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.120","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.64","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.3","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"6.19","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.0","versionEndExcluding":"5.15.198"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.0","versionEndExcluding":"6.1.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.0","versionEndExcluding":"6.6.120"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.0","versionEndExcluding":"6.12.64"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.0","versionEndExcluding":"6.18.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.0","versionEndExcluding":"6.19"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/9019e399684e3cc68c4a3f050e268f74d69c1317"},{"url":"https://git.kernel.org/stable/c/fb36846cbcc936954f2ad2bffdff13d16c0be08a"},{"url":"https://git.kernel.org/stable/c/91e448e69aca4bb0ba2e998eb3e555644db7322b"},{"url":"https://git.kernel.org/stable/c/dbc61834b0412435df21c71410562d933e4eba49"},{"url":"https://git.kernel.org/stable/c/3ed049fbfb4d75b4e0b8ab54c934f485129d5dc8"},{"url":"https://git.kernel.org/stable/c/382748c05e58a9f1935f5a653c352422375566ea"}],"title":"sched/deadline: only set free_cpus for online runqueues","x_generator":{"engine":"bippy-1.2.0"}}}}