CVE-2022-49315 (GCVE-0-2022-49315)
Vulnerability from cvelistv5
Published
2025-02-26 02:10
Modified
2026-05-11 18:57
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: drivers: staging: rtl8192e: Fix deadlock in rtllib_beacons_stop() There is a deadlock in rtllib_beacons_stop(), which is shown below: (Thread 1) | (Thread 2) | rtllib_send_beacon() rtllib_beacons_stop() | mod_timer() spin_lock_irqsave() //(1) | (wait a time) ... | rtllib_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, rtllib_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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 94a799425eee8225a1e3fbe5f473d2ef04002577
Version: 94a799425eee8225a1e3fbe5f473d2ef04002577
Version: 94a799425eee8225a1e3fbe5f473d2ef04002577
Version: 94a799425eee8225a1e3fbe5f473d2ef04002577
Version: 94a799425eee8225a1e3fbe5f473d2ef04002577
Version: 94a799425eee8225a1e3fbe5f473d2ef04002577
Version: 94a799425eee8225a1e3fbe5f473d2ef04002577
Version: 94a799425eee8225a1e3fbe5f473d2ef04002577
Version: 94a799425eee8225a1e3fbe5f473d2ef04002577
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrivers: staging: rtl8192e: Fix deadlock in rtllib_beacons_stop()\n\nThere is a deadlock in rtllib_beacons_stop(), which is shown\nbelow:\n\n   (Thread 1)              |      (Thread 2)\n                           | rtllib_send_beacon()\nrtllib_beacons_stop()      |  mod_timer()\n spin_lock_irqsave() //(1) |  (wait a time)\n ...                       | rtllib_send_beacon_cb()\n del_timer_sync()          |  spin_lock_irqsave() //(2)\n (wait timer to stop)      |  ...\n\nWe hold ieee-\u003ebeacon_lock in position (1) of thread 1 and\nuse del_timer_sync() to wait timer to stop, but timer handler\nalso need ieee-\u003ebeacon_lock in position (2) of thread 2.\nAs a result, rtllib_beacons_stop() will block forever.\n\nThis patch extracts del_timer_sync() from the protection of\nspin_lock_irqsave(), which could let timer handler to obtain\nthe needed lock."
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    "dateUpdated": "2026-05-11T18:57:19.092Z",
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