CVE-2022-49371

published 2025-02-26

CVE-2022-49371: In the Linux kernel, the following vulnerability has been resolved: driver core: fix deadlock in __device_attach In __device_attach function, The lock holding…

Priority P4 20 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:

driver core: fix deadlock in __device_attach

In __device_attach function, The lock holding logic is as follows:
...
__device_attach
device_lock(dev) // get lock dev
async_schedule_dev(__device_attach_async_helper, dev); // func
async_schedule_node
async_schedule_node_domain(func)
entry = kzalloc(sizeof(struct async_entry), GFP_ATOMIC);
/* when fail or work limit, sync to execute func, but
__device_attach_async_helper will get lock dev as
well, which will lead to A-A deadlock. */
if (!entry || atomic_read(&entry_count) > MAX_WORK) {
func;
else
queue_work_node(node, system_unbound_wq, &entry->work)
device_unlock(dev)

As shown above, when it is allowed to do async probes, because of
out of memory or work limit, async work is not allowed, to do
sync execute instead. it will lead to A-A deadlock because of
__device_attach_async_helper getting lock dev.

To fix the deadlock, move the async_schedule_dev outside device_lock,
as we can see, in async_schedule_node_domain, the parameter of
queue_work_node is system_unbound_wq, so it can accept concurrent
operations. which will also not change the code logic, and will
not lead to deadlock.

Affected

17 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	>= 765230b5f084863183aa8adb3405ab3f32c0b16e < 593b595332bd2d65e1a5c1ae7897996c157f5468	593b595332bd2d65e1a5c1ae7897996c157f5468
linux	linux	>= 765230b5f084863183aa8adb3405ab3f32c0b16e < 36ee9ffca8ef56c302f2855c4a5fccf61c0c1ada	36ee9ffca8ef56c302f2855c4a5fccf61c0c1ada
linux	linux	>= 765230b5f084863183aa8adb3405ab3f32c0b16e < df6de52b80aa3b46f5ac804412355ffe2e1df93e	df6de52b80aa3b46f5ac804412355ffe2e1df93e
linux	linux	>= 765230b5f084863183aa8adb3405ab3f32c0b16e < d53a227bfcd5160ce1b61d9954901968a20651e7	d53a227bfcd5160ce1b61d9954901968a20651e7
linux	linux	>= 765230b5f084863183aa8adb3405ab3f32c0b16e < 34fdd9b7def9d2fcb71bb7b0bc4848dd7313767e	34fdd9b7def9d2fcb71bb7b0bc4848dd7313767e
linux	linux	>= 765230b5f084863183aa8adb3405ab3f32c0b16e < b232b02bf3c205b13a26dcec08e53baddd8e59ed	b232b02bf3c205b13a26dcec08e53baddd8e59ed
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	>= 4.2 < 5.4.198	5.4.198
linux	linux_kernel	>= 5.11 < 5.15.47	5.15.47
linux	linux_kernel	>= 5.16 < 5.17.15	5.17.15
linux	linux_kernel	>= 5.18 < 5.18.4	5.18.4
linux	linux_kernel	>= 5.5 < 5.10.122	5.10.122

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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