CVE-2024-26605 (GCVE-0-2024-26605)

Vulnerability from cvelistv5 – Published: 2024-02-24 15:17 – Updated: 2025-05-04 12:54
VLAI?
Title
PCI/ASPM: Fix deadlock when enabling ASPM
Summary
In the Linux kernel, the following vulnerability has been resolved: PCI/ASPM: Fix deadlock when enabling ASPM A last minute revert in 6.7-final introduced a potential deadlock when enabling ASPM during probe of Qualcomm PCIe controllers as reported by lockdep: ============================================ WARNING: possible recursive locking detected 6.7.0 #40 Not tainted -------------------------------------------- kworker/u16:5/90 is trying to acquire lock: ffffacfa78ced000 (pci_bus_sem){++++}-{3:3}, at: pcie_aspm_pm_state_change+0x58/0xdc but task is already holding lock: ffffacfa78ced000 (pci_bus_sem){++++}-{3:3}, at: pci_walk_bus+0x34/0xbc other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(pci_bus_sem); lock(pci_bus_sem); *** DEADLOCK *** Call trace: print_deadlock_bug+0x25c/0x348 __lock_acquire+0x10a4/0x2064 lock_acquire+0x1e8/0x318 down_read+0x60/0x184 pcie_aspm_pm_state_change+0x58/0xdc pci_set_full_power_state+0xa8/0x114 pci_set_power_state+0xc4/0x120 qcom_pcie_enable_aspm+0x1c/0x3c [pcie_qcom] pci_walk_bus+0x64/0xbc qcom_pcie_host_post_init_2_7_0+0x28/0x34 [pcie_qcom] The deadlock can easily be reproduced on machines like the Lenovo ThinkPad X13s by adding a delay to increase the race window during asynchronous probe where another thread can take a write lock. Add a new pci_set_power_state_locked() and associated helper functions that can be called with the PCI bus semaphore held to avoid taking the read lock twice.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: b9c370b61d735a0e5390c42771e7eb21413f7868 , < 0f7908a016c092cfdaa16d785fa5099d867bc1a3 (git)
Affected: 8cc22ba3f77c59df5f1ac47d62df51efb28cd868 , < b0f4478838be1f1d330061201898fef65bf8fd7c (git)
Affected: f93e71aea6c60ebff8adbd8941e678302d377869 , < ef90508574d7af48420bdc5f7b9a4f1cdd26bc70 (git)
Affected: f93e71aea6c60ebff8adbd8941e678302d377869 , < 1e560864159d002b453da42bd2c13a1805515a20 (git)
Affected: 1f2f662c8bec75d1311e063efaa9107435cf16c8 (git)
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    Linux Linux Affected: 6.7
Unaffected: 0 , < 6.7 (semver)
Unaffected: 6.1.88 , ≤ 6.1.* (semver)
Unaffected: 6.6.29 , ≤ 6.6.* (semver)
Unaffected: 6.7.5 , ≤ 6.7.* (semver)
Unaffected: 6.8 , ≤ * (original_commit_for_fix)
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