Bug 2400822 (CVE-2022-50454)

Summary: CVE-2022-50454 kernel: drm/nouveau: fix a use-after-free in nouveau_gem_prime_import_sg_table()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Description OSIDB Bzimport 2025-10-01 12:09:17 UTC 
In the Linux kernel, the following vulnerability has been resolved:

drm/nouveau: fix a use-after-free in nouveau_gem_prime_import_sg_table()

nouveau_bo_init() is backed by ttm_bo_init() and ferries its return code
back to the caller. On failures, ttm will call nouveau_bo_del_ttm() and
free the memory.Thus, when nouveau_bo_init() returns an error, the gem
object has already been released. Then the call to nouveau_bo_ref() will
use the freed "nvbo->bo" and lead to a use-after-free bug.

We should delete the call to nouveau_bo_ref() to avoid the use-after-free.
Comment 1 Jon Moroney 2025-10-01 17:29:57 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025100118-CVE-2022-50454-9c7d@gregkh/T