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CVE-2022-50499

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

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 4.9.337, 4.14.303, 4.19.270, 5.3, 5.4
None on Exploit-DB, Metasploit or GitHub

Summary

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.

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From 4.9.195 · fixed in 4.9.337; From 4.14.147 · fixed in 4.14.303; From 4.19.77 · fixed in 4.19.270; From 5.2.19 · fixed in 5.3; From 5.3.4 · fixed in 5.4

  • Linux Linux

    5.4

References 9

git.kernel.org