{"cve":"CVE-2022-50045","nvd":{"published":"2025-06-18T11:15:33.050","modified":"2026-06-17T05:22:37.923","status":"Analyzed","description":"In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/pci: Fix get_phb_number() locking\n\nThe recent change to get_phb_number() causes a DEBUG_ATOMIC_SLEEP\nwarning on some systems:\n\n  BUG: sleeping function called from invalid context at kernel/locking/mutex.c:580\n  in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 1, name: swapper\n  preempt_count: 1, expected: 0\n  RCU nest depth: 0, expected: 0\n  1 lock held by swapper/1:\n   #0: c157efb0 (hose_spinlock){+.+.}-{2:2}, at: pcibios_alloc_controller+0x64/0x220\n  Preemption disabled at:\n  [<00000000>] 0x0\n  CPU: 0 PID: 1 Comm: swapper Not tainted 5.19.0-yocto-standard+ #1\n  Call Trace:\n  [d101dc90] [c073b264] dump_stack_lvl+0x50/0x8c (unreliable)\n  [d101dcb0] [c0093b70] __might_resched+0x258/0x2a8\n  [d101dcd0] [c0d3e634] __mutex_lock+0x6c/0x6ec\n  [d101dd50] [c0a84174] of_alias_get_id+0x50/0xf4\n  [d101dd80] [c002ec78] pcibios_alloc_controller+0x1b8/0x220\n  [d101ddd0] [c140c9dc] pmac_pci_init+0x198/0x784\n  [d101de50] [c140852c] discover_phbs+0x30/0x4c\n  [d101de60] [c0007fd4] do_one_initcall+0x94/0x344\n  [d101ded0] [c1403b40] kernel_init_freeable+0x1a8/0x22c\n  [d101df10] [c00086e0] kernel_init+0x34/0x160\n  [d101df30] [c001b334] ret_from_kernel_thread+0x5c/0x64\n\nThis is because pcibios_alloc_controller() holds hose_spinlock but\nof_alias_get_id() takes of_mutex which can sleep.\n\nThe hose_spinlock protects the phb_bitmap, and also the hose_list, but\nit doesn't need to be held while get_phb_number() calls the OF routines,\nbecause those are only looking up information in the device tree.\n\nSo fix it by having get_phb_number() take the hose_spinlock itself, only\nwhere required, and then dropping the lock before returning.\npcibios_alloc_controller() then needs to take the lock again before the\nlist_add() but that's safe, the order of the list is not important.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":["CWE-667"],"references":["https://git.kernel.org/stable/c/1d9e75c3d8cdf7c96a94cb77450d4ee070279e6a","https://git.kernel.org/stable/c/5db5ce0f1963c6c8275719a80cb65e9c98d32726","https://git.kernel.org/stable/c/6f75057c21eab12c6ccb7f06f859641a6edfab99","https://git.kernel.org/stable/c/8d48562a2729742f767b0fdd994d6b2a56a49c63","https://git.kernel.org/stable/c/90f195c01a2e8d8da6281791617e21109719c981"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:03:23.287444849+00:00"},"epss":{"cve":"CVE-2022-50045","score":0.00147,"percentile":0.03908,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}