{"id":"CVE-2024-50249","summary":"ACPI: CPPC: Make rmw_lock a raw_spin_lock","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nACPI: CPPC: Make rmw_lock a raw_spin_lock\n\nThe following BUG was triggered:\n\n=============================\n[ BUG: Invalid wait context ]\n6.12.0-rc2-XXX #406 Not tainted\n-----------------------------\nkworker/1:1/62 is trying to lock:\nffffff8801593030 (&cpc_ptr-\u003ermw_lock){+.+.}-{3:3}, at: cpc_write+0xcc/0x370\nother info that might help us debug this:\ncontext-{5:5}\n2 locks held by kworker/1:1/62:\n  #0: ffffff897ef5ec98 (&rq-\u003e__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2c/0x50\n  #1: ffffff880154e238 (&sg_policy-\u003eupdate_lock){....}-{2:2}, at: sugov_update_shared+0x3c/0x280\nstack backtrace:\nCPU: 1 UID: 0 PID: 62 Comm: kworker/1:1 Not tainted 6.12.0-rc2-g9654bd3e8806 #406\nWorkqueue:  0x0 (events)\nCall trace:\n  dump_backtrace+0xa4/0x130\n  show_stack+0x20/0x38\n  dump_stack_lvl+0x90/0xd0\n  dump_stack+0x18/0x28\n  __lock_acquire+0x480/0x1ad8\n  lock_acquire+0x114/0x310\n  _raw_spin_lock+0x50/0x70\n  cpc_write+0xcc/0x370\n  cppc_set_perf+0xa0/0x3a8\n  cppc_cpufreq_fast_switch+0x40/0xc0\n  cpufreq_driver_fast_switch+0x4c/0x218\n  sugov_update_shared+0x234/0x280\n  update_load_avg+0x6ec/0x7b8\n  dequeue_entities+0x108/0x830\n  dequeue_task_fair+0x58/0x408\n  __schedule+0x4f0/0x1070\n  schedule+0x54/0x130\n  worker_thread+0xc0/0x2e8\n  kthread+0x130/0x148\n  ret_from_fork+0x10/0x20\n\nsugov_update_shared() locks a raw_spinlock while cpc_write() locks a\nspinlock.\n\nTo have a correct wait-type order, update rmw_lock to a raw spinlock and\nensure that interrupts will be disabled on the CPU holding it.\n\n[ rjw: Changelog edits ]","modified":"2026-03-20T12:38:15.754098Z","published":"2024-11-09T10:14:57.833Z","related":["MGASA-2024-0368","MGASA-2024-0369","SUSE-SU-2024:4314-1","SUSE-SU-2024:4315-1","SUSE-SU-2024:4316-1","SUSE-SU-2024:4318-1","SUSE-SU-2024:4364-1","SUSE-SU-2024:4376-1","SUSE-SU-2024:4387-1","SUSE-SU-2025:20163-1","SUSE-SU-2025:20164-1","SUSE-SU-2025:20246-1","SUSE-SU-2025:20247-1","USN-7276-1","USN-7277-1","openSUSE-SU-2024:14500-1","openSUSE-SU-2025:14705-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/50xxx/CVE-2024-50249.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0eb2b767c42fac61ab23c4063eb456baa4c2c262"},{"type":"WEB","url":"https://git.kernel.org/stable/c/1c10941e34c5fdc0357e46a25bd130d9cf40b925"},{"type":"WEB","url":"https://git.kernel.org/stable/c/23039b4aaf1e82e0feea1060834d4ec34262e453"},{"type":"WEB","url":"https://git.kernel.org/stable/c/43b1df48d1e7000a214acd1a81b8012ca8a929c8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c46d6b02588000c27b7b869388c2c0278bd0d173"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/50xxx/CVE-2024-50249.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-50249"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"94e8c988468dafde1d2bfe0532a60a3117f6394b"},{"fixed":"c46d6b02588000c27b7b869388c2c0278bd0d173"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"f812ca13a0d3e3aa418da36b66ca40df0d6f9e60"},{"fixed":"23039b4aaf1e82e0feea1060834d4ec34262e453"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"8ad28208be7bbe748e90442c45963ddbef0fd1e2"},{"fixed":"0eb2b767c42fac61ab23c4063eb456baa4c2c262"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"20cde05aa8bcd7a5ff36a609d813189b7cdbe692"},{"fixed":"43b1df48d1e7000a214acd1a81b8012ca8a929c8"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"60949b7b805424f21326b450ca4f1806c06d982e"},{"fixed":"1c10941e34c5fdc0357e46a25bd130d9cf40b925"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"82cee12ada68dfd438c7faca152dbfe042868743"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2024-50249.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}