{"id":"CVE-2024-26605","summary":"PCI/ASPM: Fix deadlock when enabling ASPM","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nPCI/ASPM: Fix deadlock when enabling ASPM\n\nA last minute revert in 6.7-final introduced a potential deadlock when\nenabling ASPM during probe of Qualcomm PCIe controllers as reported by\nlockdep:\n\n  ============================================\n  WARNING: possible recursive locking detected\n  6.7.0 #40 Not tainted\n  --------------------------------------------\n  kworker/u16:5/90 is trying to acquire lock:\n  ffffacfa78ced000 (pci_bus_sem){++++}-{3:3}, at: pcie_aspm_pm_state_change+0x58/0xdc\n\n              but task is already holding lock:\n  ffffacfa78ced000 (pci_bus_sem){++++}-{3:3}, at: pci_walk_bus+0x34/0xbc\n\n              other info that might help us debug this:\n   Possible unsafe locking scenario:\n\n         CPU0\n         ----\n    lock(pci_bus_sem);\n    lock(pci_bus_sem);\n\n               *** DEADLOCK ***\n\n  Call trace:\n   print_deadlock_bug+0x25c/0x348\n   __lock_acquire+0x10a4/0x2064\n   lock_acquire+0x1e8/0x318\n   down_read+0x60/0x184\n   pcie_aspm_pm_state_change+0x58/0xdc\n   pci_set_full_power_state+0xa8/0x114\n   pci_set_power_state+0xc4/0x120\n   qcom_pcie_enable_aspm+0x1c/0x3c [pcie_qcom]\n   pci_walk_bus+0x64/0xbc\n   qcom_pcie_host_post_init_2_7_0+0x28/0x34 [pcie_qcom]\n\nThe deadlock can easily be reproduced on machines like the Lenovo ThinkPad\nX13s by adding a delay to increase the race window during asynchronous\nprobe where another thread can take a write lock.\n\nAdd a new pci_set_power_state_locked() and associated helper functions that\ncan be called with the PCI bus semaphore held to avoid taking the read lock\ntwice.","modified":"2026-03-20T12:35:03.465244Z","published":"2024-02-24T15:17:13.899Z","related":["openSUSE-SU-2024:13767-1","openSUSE-SU-2025:14705-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/26xxx/CVE-2024-26605.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0f7908a016c092cfdaa16d785fa5099d867bc1a3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/1e560864159d002b453da42bd2c13a1805515a20"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b0f4478838be1f1d330061201898fef65bf8fd7c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ef90508574d7af48420bdc5f7b9a4f1cdd26bc70"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/26xxx/CVE-2024-26605.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-26605"},{"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":"b9c370b61d735a0e5390c42771e7eb21413f7868"},{"fixed":"0f7908a016c092cfdaa16d785fa5099d867bc1a3"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"8cc22ba3f77c59df5f1ac47d62df51efb28cd868"},{"fixed":"b0f4478838be1f1d330061201898fef65bf8fd7c"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"f93e71aea6c60ebff8adbd8941e678302d377869"},{"fixed":"ef90508574d7af48420bdc5f7b9a4f1cdd26bc70"},{"fixed":"1e560864159d002b453da42bd2c13a1805515a20"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"1f2f662c8bec75d1311e063efaa9107435cf16c8"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2024-26605.json"}}],"schema_version":"1.7.5"}