CVE-2022-49446

published 2025-02-26

CVE-2022-49446: In the Linux kernel, the following vulnerability has been resolved: nvdimm: Fix firmware activation deadlock scenarios Lockdep reports the following deadlock…

Priority P4 22 medium 5.5 CVSS 3.1

AV L AC L PR L UI N S U C N I N A H

In the Linux kernel, the following vulnerability has been resolved:

nvdimm: Fix firmware activation deadlock scenarios

Lockdep reports the following deadlock scenarios for CXL root device
power-management, device_prepare(), operations, and device_shutdown()
operations for 'nd_region' devices:

Chain exists of:
&nvdimm_region_key --> &nvdimm_bus->reconfig_mutex --> system_transition_mutex

Possible unsafe locking scenario:

CPU0 CPU1
---- ----
lock(system_transition_mutex);
lock(&nvdimm_bus->reconfig_mutex);
lock(system_transition_mutex);
lock(&nvdimm_region_key);

Chain exists of:
&cxl_nvdimm_bridge_key --> acpi_scan_lock --> &cxl_root_key

Possible unsafe locking scenario:

CPU0 CPU1
---- ----
lock(&cxl_root_key);
lock(acpi_scan_lock);
lock(&cxl_root_key);
lock(&cxl_nvdimm_bridge_key);

These stem from holding nvdimm_bus_lock() over hibernate_quiet_exec()
which walks the entire system device topology taking device_lock() along
the way. The nvdimm_bus_lock() is protecting against unregistration,
multiple simultaneous ops callers, and preventing activate_show() from
racing activate_store(). For the first 2, the lock is redundant.
Unregistration already flushes all ops users, and sysfs already prevents
multiple threads to be active in an ops handler at the same time. For
the last userspace should already be waiting for its last
activate_store() to complete, and does not need activate_show() to flush
the write side, so this lock usage can be deleted in these attributes.

Affected

15 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 5.18.5-1 (bookworm)	linux 5.18.5-1 (bookworm)
linux	linux	—	—
linux	linux	>= 48001ea50d17f3eb06a552e9ecf21f7fc01b25da < 641649f31e20df630310f5c22f26c071acc676d4	641649f31e20df630310f5c22f26c071acc676d4
linux	linux	>= 48001ea50d17f3eb06a552e9ecf21f7fc01b25da < 2f97ebc58d5fc83ca1528cd553fa725472ab3ca8	2f97ebc58d5fc83ca1528cd553fa725472ab3ca8
linux	linux	>= 48001ea50d17f3eb06a552e9ecf21f7fc01b25da < ceb924ee16b2c8e48dcac3d9ad6be01c40b5a228	ceb924ee16b2c8e48dcac3d9ad6be01c40b5a228
linux	linux	>= 48001ea50d17f3eb06a552e9ecf21f7fc01b25da < 2fd853fdb40afc052de338693df1372f2ead7be7	2fd853fdb40afc052de338693df1372f2ead7be7
linux	linux	>= 48001ea50d17f3eb06a552e9ecf21f7fc01b25da < e6829d1bd3c4b58296ee9e412f7ed4d6cb390192	e6829d1bd3c4b58296ee9e412f7ed4d6cb390192
linux	linux_kernel	>= 0 < 5.10.127-1	5.10.127-1
linux	linux_kernel	>= 0 < 5.18.5-1	5.18.5-1
linux	linux_kernel	>= 0 < 5.18.5-1	5.18.5-1
linux	linux_kernel	>= 0 < 5.18.5-1	5.18.5-1
linux	linux_kernel	>= 5.11 < 5.15.46	5.15.46
linux	linux_kernel	>= 5.16 < 5.17.14	5.17.14
linux	linux_kernel	>= 5.18 < 5.18.3	5.18.3
linux	linux_kernel	>= 5.9 < 5.10.121	5.10.121

CVSS provenance

nvd v3.1 5.5 MEDIUM CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

osv 5.5 MEDIUM

vendor_debian 5.5 MEDIUM

vendor_redhat 5.5 MEDIUM

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