CVE-2021-47334

Summary

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

misc/libmasm/module: Fix two use after free in ibmasm_init_one

In ibmasm_init_one, it calls ibmasm_init_remote_input_dev(). Inside ibmasm_init_remote_input_dev, mouse_dev and keybd_dev are allocated by input_allocate_device(), and assigned to sp->remote.mouse_dev and sp->remote.keybd_dev respectively.

In the err_free_devices error branch of ibmasm_init_one, mouse_dev and keybd_dev are freed by input_free_device(), and return error. Then the execution runs into error_send_message error branch of ibmasm_init_one, where ibmasm_free_remote_input_dev(sp) is called to unregister the freed sp->remote.mouse_dev and sp->remote.keybd_dev.

My patch add a "error_init_remote" label to handle the error of ibmasm_init_remote_input_dev(), to avoid the uaf bugs.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux736ce43295682d060f2b93624b4a339f9af6aab1 < 1512e7dc5eb08b7d92a12e2bfcd9cb8c4a1ec069affected
LinuxLinux736ce43295682d060f2b93624b4a339f9af6aab1 < 29ba8e2ba89ee2862a26d91204dd5fe77ceee25aaffected
LinuxLinux736ce43295682d060f2b93624b4a339f9af6aab1 < 5b06ca113bf197aab2ab61288f42506e0049fbabaffected
LinuxLinux736ce43295682d060f2b93624b4a339f9af6aab1 < 481a76d4749ee3a27f902ba213fdcbb4bb39720eaffected
LinuxLinux736ce43295682d060f2b93624b4a339f9af6aab1 < 38660031e80eaa6cc9370b031c180612f414b00daffected
LinuxLinux736ce43295682d060f2b93624b4a339f9af6aab1 < b9c87ce3bc6331f82811a8cf8e930423c22523a3affected
LinuxLinux736ce43295682d060f2b93624b4a339f9af6aab1 < ef1067d2baa847d53c9988510d99fb494de4d12caffected
LinuxLinux736ce43295682d060f2b93624b4a339f9af6aab1 < a7268e8a227d5a4f0bd1584f556246b0224ab274affected
LinuxLinux736ce43295682d060f2b93624b4a339f9af6aab1 < 7272b591c4cb9327c43443f67b8fbae7657dd9aeaffected
LinuxLinux2.6.16affected
LinuxLinux0 < 2.6.16unaffected
LinuxLinux4.4.276 <= 4.4.*unaffected
LinuxLinux4.9.276 <= 4.9.*unaffected
LinuxLinux4.14.240 <= 4.14.*unaffected
LinuxLinux4.19.198 <= 4.19.*unaffected
LinuxLinux5.4.134 <= 5.4.*unaffected
LinuxLinux5.10.52 <= 5.10.*unaffected
LinuxLinux5.12.19 <= 5.12.*unaffected
LinuxLinux5.13.4 <= 5.13.*unaffected
LinuxLinux5.14 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

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

CVE Program Container

Additional References

References