Bug 2401454 (CVE-2022-50499)

Summary: CVE-2022-50499 kernel: media: dvb-core: Fix double free in dvb_register_device()
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 2025-10-04 16:01:11 UTC 
In the Linux kernel, the following vulnerability has been resolved:

media: dvb-core: Fix double free in dvb_register_device()

In function dvb_register_device() -> dvb_register_media_device() ->
dvb_create_media_entity(), dvb->entity is allocated and initialized. If
the initialization fails, it frees the dvb->entity, and return an error
code. The caller takes the error code and handles the error by calling
dvb_media_device_free(), which unregisters the entity and frees the
field again if it is not NULL. As dvb->entity may not NULLed in
dvb_create_media_entity() when the allocation of dvbdev->pad fails, a
double free may occur. This may also cause an Use After free in
media_device_unregister_entity().

Fix this by storing NULL to dvb->entity when it is freed.
Comment 1 Alexander B 2025-10-06 17:49:40 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025100420-CVE-2022-50499-9f94@gregkh/T