CVE-2022-50274

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < ac521bbe3d00fa574e66a9361763f2b37725bc97affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 219b44bf94203bd433aa91b7796475bf656348e5affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 6d18b44bb44e1f4d97dfe0efe92ac0f0984739c2affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 2abd73433872194bccdf1432a0980e4ec5273c2aaffected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 88a6f8a72d167294c0931c7874941bf37a41b6ddaffected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < a2f0a08aa613176c9688c81d7b598a7779974991affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 9945d05d6693710574f354c5dbddc47f5101eb77affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 0fc044b2b5e2d05a1fa1fb0d7f270367a7855d79affected
LinuxLinux2.6.12affected
LinuxLinux0 < 2.6.12unaffected
LinuxLinux4.14.303 <= 4.14.*unaffected
LinuxLinux4.19.270 <= 4.19.*unaffected
LinuxLinux5.4.229 <= 5.4.*unaffected
LinuxLinux5.10.163 <= 5.10.*unaffected
LinuxLinux5.15.86 <= 5.15.*unaffected
LinuxLinux6.0.16 <= 6.0.*unaffected
LinuxLinux6.1.2 <= 6.1.*unaffected
LinuxLinux6.2 <= *unaffected

Weaknesses

References