CVE-2022-50499
media: dvb-core: Fix double free in dvb_register_device()
Description
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.
INFO
Published Date :
Oct. 4, 2025, 4:15 p.m.
Last Modified :
Oct. 6, 2025, 2:56 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
- Ensure entities are set to NULL after freeing.
- Store NULL to dvb->entity when it is freed.
- Apply kernel patches addressing the double free issue.
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CVE-2022-50499
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CWE - Common Weakness Enumeration
While CVE identifies
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weaknesses that can lead to vulnerabilities. CVE-2022-50499
is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
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approaches employed by adversaries to exploit the CVE-2022-50499
weaknesses.
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CVE-2022-50499
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New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Oct. 04, 2025
Action Type Old Value New Value Added Description 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. Added Reference https://git.kernel.org/stable/c/0588b12c418c3e4f927ced11f27b02ef4a5bfb07 Added Reference https://git.kernel.org/stable/c/123eddf92a114e03919942641d2c2b1f4ca56ea6 Added Reference https://git.kernel.org/stable/c/6b0d0477fce747d4137aa65856318b55fba72198 Added Reference https://git.kernel.org/stable/c/70bc51303871159796b55ba1a8f16637b46c2511 Added Reference https://git.kernel.org/stable/c/772892b29ac50c2c5e918fc80104aa6ede81d837 Added Reference https://git.kernel.org/stable/c/7dd5a68cdbbbe7fc67ba701cb52ba10d8ba149f8 Added Reference https://git.kernel.org/stable/c/acf984a3718c2458eb9e08b6714490a04f213c58 Added Reference https://git.kernel.org/stable/c/b21f62b49ee9c3e0216d685d9cfd6003e5727271 Added Reference https://git.kernel.org/stable/c/e9a78485b658361fab6a5547377be6c1af6f1b3d