CVE-2021-47088

Summary

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

mm/damon/dbgfs: protect targets destructions with kdamond_lock

DAMON debugfs interface iterates current monitoring targets in 'dbgfs_target_ids_read()' while holding the corresponding 'kdamond_lock'. However, it also destructs the monitoring targets in 'dbgfs_before_terminate()' without holding the lock. This can result in a use_after_free bug. This commit avoids the race by protecting the destruction with the corresponding 'kdamond_lock'.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux4bc05954d0076655cfaf6f0135585bdc20cd6b11 < 330c6117a82c16a9a365a51cec5c9ab30b13245caffected
LinuxLinux4bc05954d0076655cfaf6f0135585bdc20cd6b11 < 34796417964b8d0aef45a99cf6c2d20cebe33733affected
LinuxLinux5.15affected
LinuxLinux0 < 5.15unaffected
LinuxLinux5.15.12 <= 5.15.*unaffected
LinuxLinux5.16 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

CISA ADP Vulnrichment

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

References