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CVE-2022-50274: media: dvbdev: adopts refcnt to avoid UAF

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-09-15 · updated 2026-08-04
• Weakness: CWE-416

Description

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 kernel: before 4.14.303; from 4.15 before 4.19.270; from 4.20 before 5.4.229; from 5.5 before 5.10.163; from 5.11 before 5.15.86; from 5.16 before 6.0.16 — fixed in 4.14.303, 4.19.270, 5.10.163, 5.15.86, 5.4.229, 6.0.16

How to fix

Upgrade to a fixed version: Linux kernel 4.14.303, 4.19.270, 5.10.163, 5.15.86. Check the vendor advisory for mitigations.

References

• 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

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