CVE-2022-50417

Summary

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

drm/panfrost: Fix GEM handle creation ref-counting

panfrost_gem_create_with_handle() previously returned a BO but with the only reference being from the handle, which user space could in theory guess and release, causing a use-after-free. Additionally if the call to panfrost_gem_mapping_get() in panfrost_ioctl_create_bo() failed then a(nother) reference on the BO was dropped.

The _create_with_handle() is a problematic pattern, so ditch it and instead create the handle in panfrost_ioctl_create_bo(). If the call to panfrost_gem_mapping_get() fails then this means that user space has indeed gone behind our back and freed the handle. In which case just return an error code.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxf3ba91228e8e917e5bd6c4b72bfe846933d17370 < 0b70f6ea4d4f2b4d4b291d86ab76b4d07394932caffected
LinuxLinuxf3ba91228e8e917e5bd6c4b72bfe846933d17370 < 4f1105ee72d8c7c35d90e3491b31b2d9d6b7e33aaffected
LinuxLinuxf3ba91228e8e917e5bd6c4b72bfe846933d17370 < 3f9feffa8a5ab08b4e298a27b1aa7204a7d42ca2affected
LinuxLinuxf3ba91228e8e917e5bd6c4b72bfe846933d17370 < ba3d2c2380e7129b525a787489c0b7e819a3b898affected
LinuxLinuxf3ba91228e8e917e5bd6c4b72bfe846933d17370 < 4217c6ac817451d5116687f3cc6286220dc43d49affected
LinuxLinux5.2affected
LinuxLinux0 < 5.2unaffected
LinuxLinux5.10.163 <= 5.10.*unaffected
LinuxLinux5.15.87 <= 5.15.*unaffected
LinuxLinux6.0.19 <= 6.0.*unaffected
LinuxLinux6.1.5 <= 6.1.*unaffected
LinuxLinux6.2 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

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

References