CVE-2022-49305

published 2025-02-26

CVE-2022-49305: In the Linux kernel, the following vulnerability has been resolved: drivers: staging: rtl8192u: Fix deadlock in ieee80211_beacons_stop() There is a deadlock in…

Priority P4 19 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: rtl8192u: Fix deadlock in ieee80211_beacons_stop()

There is a deadlock in ieee80211_beacons_stop(), which is shown below:

(Thread 1) | (Thread 2)
| ieee80211_send_beacon()
ieee80211_beacons_stop() | mod_timer()
spin_lock_irqsave() //(1) | (wait a time)
... | ieee80211_send_beacon_cb()
del_timer_sync() | spin_lock_irqsave() //(2)
(wait timer to stop) | ...

We hold ieee->beacon_lock in position (1) of thread 1 and use
del_timer_sync() to wait timer to stop, but timer handler
also need ieee->beacon_lock in position (2) of thread 2.
As a result, ieee80211_beacons_stop() will block forever.

This patch extracts del_timer_sync() from the protection of
spin_lock_irqsave(), which could let timer handler to obtain
the needed lock.

Affected

19 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	>= 8fc8598e61f6f384f3eaf1d9b09500c12af47b37 < b465bb2ebf666116c1ac745cb80c65154dc0d27e	b465bb2ebf666116c1ac745cb80c65154dc0d27e
linux	linux	>= 8fc8598e61f6f384f3eaf1d9b09500c12af47b37 < 1fbe033c52480f7954c057510040fa6286c4ea25	1fbe033c52480f7954c057510040fa6286c4ea25
linux	linux	>= 8fc8598e61f6f384f3eaf1d9b09500c12af47b37 < 66f769762f65d957f688f3258755c6ec410bf710	66f769762f65d957f688f3258755c6ec410bf710
linux	linux	>= 8fc8598e61f6f384f3eaf1d9b09500c12af47b37 < 042915c1bfedd684c1d98a841794ee203200571a	042915c1bfedd684c1d98a841794ee203200571a
linux	linux	>= 8fc8598e61f6f384f3eaf1d9b09500c12af47b37 < ffc9cab7243f8151be37966301307bfd3cda2db3	ffc9cab7243f8151be37966301307bfd3cda2db3
linux	linux	>= 8fc8598e61f6f384f3eaf1d9b09500c12af47b37 < b34cb54923a6e5ddefbaf358c85c922c6ab456e2	b34cb54923a6e5ddefbaf358c85c922c6ab456e2
linux	linux	>= 8fc8598e61f6f384f3eaf1d9b09500c12af47b37 < 806c7b53414934ba2a39449b31fd1a038e500273	806c7b53414934ba2a39449b31fd1a038e500273
linux	linux_kernel	< 4.19.247	4.19.247
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	>= 4.20 < 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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