CVE-2022-49309

published 2025-02-26

CVE-2022-49309: In the Linux kernel, the following vulnerability has been resolved: drivers: staging: rtl8723bs: Fix deadlock in rtw_surveydone_event_callback() There is a…

Priority P4 18 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:

drivers: staging: rtl8723bs: Fix deadlock in rtw_surveydone_event_callback()

There is a deadlock in rtw_surveydone_event_callback(),
which is shown below:

(Thread 1) | (Thread 2)
| _set_timer()
rtw_surveydone_event_callback()| mod_timer()
spin_lock_bh() //(1) | (wait a time)
... | rtw_scan_timeout_handler()
del_timer_sync() | spin_lock_bh() //(2)
(wait timer to stop) | ...

We hold pmlmepriv->lock in position (1) of thread 1 and use
del_timer_sync() to wait timer to stop, but timer handler
also need pmlmepriv->lock in position (2) of thread 2.
As a result, rtw_surveydone_event_callback() will block forever.

This patch extracts del_timer_sync() from the protection of
spin_lock_bh(), which could let timer handler to obtain
the needed lock. What`s more, we change spin_lock_bh() in
rtw_scan_timeout_handler() to spin_lock_irq(). Otherwise,
spin_lock_bh() will also cause deadlock() in timer handler.

Affected

14 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	>= 554c0a3abf216c991c5ebddcdb2c08689ecd290b < c84e5c819600ee0628f61b33d145258ae0f3d7a7	c84e5c819600ee0628f61b33d145258ae0f3d7a7
linux	linux	>= 554c0a3abf216c991c5ebddcdb2c08689ecd290b < f89f6c3ebf69623b8ea48200bd690e9e210335a1	f89f6c3ebf69623b8ea48200bd690e9e210335a1
linux	linux	>= 554c0a3abf216c991c5ebddcdb2c08689ecd290b < ce129d3efd181da5fd56f4360cc8827122afa67e	ce129d3efd181da5fd56f4360cc8827122afa67e
linux	linux	>= 554c0a3abf216c991c5ebddcdb2c08689ecd290b < 2c41f5c341853f84b7bc2f32605d4e2782e8c279	2c41f5c341853f84b7bc2f32605d4e2782e8c279
linux	linux	>= 554c0a3abf216c991c5ebddcdb2c08689ecd290b < cc7ad0d77b51c872d629bcd98aea463a3c4109e7	cc7ad0d77b51c872d629bcd98aea463a3c4109e7
linux	linux_kernel	< 5.15.47	5.15.47
linux	linux_kernel	>= 0 < 5.10.237-1	5.10.237-1
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	>= 5.16 < 5.17.15	5.17.15
linux	linux_kernel	>= 5.18 < 5.18.4	5.18.4

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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