Vulnerability Database

298,930

Total vulnerabilities in the database

CVE-2022-49315

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.

  • Published: Feb 26, 2025
  • Updated: May 4, 2025
  • CVE: CVE-2022-49315
  • Severity: Medium
  • Exploit:

CVSS v3:

  • Severity: Medium
  • Score: 5.5
  • AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CWEs:

Software From Fixed in
linux / linux_kernel 4.20 5.4.198
linux / linux_kernel 4.10 4.14.283
linux / linux_kernel 4.15 4.19.247
linux / linux_kernel 5.18 5.18.4
linux / linux_kernel 5.16 5.17.15
linux / linux_kernel 5.11 5.15.47
linux / linux_kernel - 4.9.318
linux / linux_kernel 5.5 5.10.122