Bugzilla – Bug 1250000
VUL-0: CVE-2022-50274: kernel: media: dvbdev: adopts refcnt to avoid UAF
Last modified: 2026-05-05 17:03:20 UTC
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. References: http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2022-50274 https://www.cve.org/CVERecord?id=CVE-2022-50274 https://git.kernel.org/stable/c/0fc044b2b5e2d05a1fa1fb0d7f270367a7855d79 https://git.kernel.org/stable/c/219b44bf94203bd433aa91b7796475bf656348e5 https://git.kernel.org/stable/c/2abd73433872194bccdf1432a0980e4ec5273c2a https://git.kernel.org/stable/c/6d18b44bb44e1f4d97dfe0efe92ac0f0984739c2 https://git.kernel.org/stable/c/88a6f8a72d167294c0931c7874941bf37a41b6dd https://git.kernel.org/stable/c/9945d05d6693710574f354c5dbddc47f5101eb77 https://git.kernel.org/stable/c/a2f0a08aa613176c9688c81d7b598a7779974991 https://git.kernel.org/stable/c/ac521bbe3d00fa574e66a9361763f2b37725bc97 https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2022/CVE-2022-50274.mbox https://bugzilla.redhat.com/show_bug.cgi?id=2395314
all done