media: dvbdev: adopts refcnt to avoid UAF
3Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackepss 0.1%
exploitation probability
0.1%top 95% of all CVEs
observed exploitation
nono source reports it
In the Linux kernel, the following vulnerability has been resolved:
media: dvbdev: adopts refcnt to avoid UAF
dvb_unregister_device() is known that prone to use-after-free.
That is, the cleanup from dvb_unregister_device() releases the dvb_device
even if there are pointers stored in file->private_data still refer to it.
This patch adds a reference counter into struct dvb_device and delays its
deallocation until no pointer refers to the object.
Affected products
Linux · LinuxReferences
https://git.kernel.org/stable/c/0fc044b2b5e2d05a1fa1fb0d7f270367a7855d79https://git.kernel.org/stable/c/219b44bf94203bd433aa91b7796475bf656348e5https://git.kernel.org/stable/c/2abd73433872194bccdf1432a0980e4ec5273c2ahttps://git.kernel.org/stable/c/6d18b44bb44e1f4d97dfe0efe92ac0f0984739c2https://git.kernel.org/stable/c/88a6f8a72d167294c0931c7874941bf37a41b6ddhttps://git.kernel.org/stable/c/9945d05d6693710574f354c5dbddc47f5101eb77https://git.kernel.org/stable/c/a2f0a08aa613176c9688c81d7b598a7779974991https://git.kernel.org/stable/c/ac521bbe3d00fa574e66a9361763f2b37725bc97