CVE-2022-49315

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux94a799425eee8225a1e3fbe5f473d2ef04002577 < 4681129fda9e8555392eaaadb239ec6a6e2b3e12affected
LinuxLinux94a799425eee8225a1e3fbe5f473d2ef04002577 < 381045dc64d23a2229c47c5524c06bfc33d34446affected
LinuxLinux94a799425eee8225a1e3fbe5f473d2ef04002577 < 08bacf871c019163ccd1389d0bc957a43324967aaffected
LinuxLinux94a799425eee8225a1e3fbe5f473d2ef04002577 < 64b05fa212c7e4d057676e8b7e7120c6eb2f615baffected
LinuxLinux94a799425eee8225a1e3fbe5f473d2ef04002577 < 0f69d7d5e918aa43423d86bd17ddb11b1b5e8adaaffected
LinuxLinux94a799425eee8225a1e3fbe5f473d2ef04002577 < fef451f0fbbe85dbd2962b18379d02e2965610dbaffected
LinuxLinux94a799425eee8225a1e3fbe5f473d2ef04002577 < 46c861009bf437a18417df24cea0d181741b7d72affected
LinuxLinux94a799425eee8225a1e3fbe5f473d2ef04002577 < ffd4c4d5293e4985092ea45ba21cad9326e2e434affected
LinuxLinux94a799425eee8225a1e3fbe5f473d2ef04002577 < 9b6bdbd9337de3917945847bde262a34a87a6303affected
LinuxLinux3.2affected
LinuxLinux0 < 3.2unaffected
LinuxLinux4.9.318 <= 4.9.*unaffected
LinuxLinux4.14.283 <= 4.14.*unaffected
LinuxLinux4.19.247 <= 4.19.*unaffected
LinuxLinux5.4.198 <= 5.4.*unaffected
LinuxLinux5.10.122 <= 5.10.*unaffected
LinuxLinux5.15.47 <= 5.15.*unaffected
LinuxLinux5.17.15 <= 5.17.*unaffected
LinuxLinux5.18.4 <= 5.18.*unaffected
LinuxLinux5.19 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References