CVE-2022-48735

Summary

In the Linux kernel, the following vulnerability has been resolved:

ALSA: hda: Fix UAF of leds class devs at unbinding

The LED class devices that are created by HD-audio codec drivers are registered via devm_led_classdev_register() and associated with the HD-audio codec device. Unfortunately, it turned out that the devres release doesn't work for this case; namely, since the codec resource release happens before the devm call chain, it triggers a NULL dereference or a UAF for a stale set_brightness_delay callback.

For fixing the bug, this patch changes the LED class device register and unregister in a manual manner without devres, keeping the instances in hda_gen_spec.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux15509b6344726de22bdbfff88b65341dd0dd33af < a7de1002135cf94367748ffc695a29812d7633b5affected
LinuxLinux15509b6344726de22bdbfff88b65341dd0dd33af < 0e629052f013eeb61494d4df2f1f647c2a9aef47affected
LinuxLinux15509b6344726de22bdbfff88b65341dd0dd33af < 813e9f3e06d22e29872d4fd51b54992d89cf66c8affected
LinuxLinux15509b6344726de22bdbfff88b65341dd0dd33af < 549f8ffc7b2f7561bea7f90930b6c5104318e87baffected
LinuxLinux5.9affected
LinuxLinux0 < 5.9unaffected
LinuxLinux5.10.99 <= 5.10.*unaffected
LinuxLinux5.15.22 <= 5.15.*unaffected
LinuxLinux5.16.8 <= 5.16.*unaffected
LinuxLinux5.17 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

CISA ADP Vulnrichment

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

References