Bug 2396509 (CVE-2022-50417)

Summary: CVE-2022-50417 kernel: drm/panfrost: Fix GEM handle creation ref-counting
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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OS: Linux   
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Description OSIDB Bzimport 2025-09-18 17:02:22 UTC 
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.
Comment 1 Keith Grant 2025-09-18 19:32:01 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025091855-CVE-2022-50417-1a69@gregkh/T