CVE-2022-50725
Unknown Unknown - Not Provided

Use-After-Free in Linux vidtv Bridge DVB Initialization

Publication date: 2025-12-24

Last updated on: 2025-12-24

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: media: vidtv: Fix use-after-free in vidtv_bridge_dvb_init() KASAN reports a use-after-free: BUG: KASAN: use-after-free in dvb_dmxdev_release+0x4d5/0x5d0 [dvb_core] Call Trace: ... dvb_dmxdev_release+0x4d5/0x5d0 [dvb_core] vidtv_bridge_probe+0x7bf/0xa40 [dvb_vidtv_bridge] platform_probe+0xb6/0x170 ... Allocated by task 1238: ... dvb_register_device+0x1a7/0xa70 [dvb_core] dvb_dmxdev_init+0x2af/0x4a0 [dvb_core] vidtv_bridge_probe+0x766/0xa40 [dvb_vidtv_bridge] ... Freed by task 1238: dvb_register_device+0x6d2/0xa70 [dvb_core] dvb_dmxdev_init+0x2af/0x4a0 [dvb_core] vidtv_bridge_probe+0x766/0xa40 [dvb_vidtv_bridge] ... It is because the error handling in vidtv_bridge_dvb_init() is wrong. First, vidtv_bridge_dmx(dev)_init() will clean themselves when fail, but goto fail_dmx(_dev): calls release functions again, which causes use-after-free. Also, in fail_fe, fail_tuner_probe and fail_demod_probe, j = i will cause out-of-bound when i finished its loop (i == NUM_FE). And the loop releasing is wrong, although now NUM_FE is 1 so it won't cause problem. Fix this by correctly releasing everything.

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Meta Information

Published
2025-12-24
Last Modified
2025-12-24
Generated
2026-07-06
AI Q&A
2025-12-24
EPSS Evaluated
2026-07-04
NVD
CVE-2022-50725
EUVD
EUVD-2022-55764

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
vidtv vidtv_bridge *

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Exploitability

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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability is a use-after-free bug in the Linux kernel's vidtv_bridge_dvb_init() function. The error handling in this function is incorrect, causing it to release memory twice. Specifically, vidtv_bridge_dmx(dev)_init() cleans up on failure, but the subsequent goto fail_dmx(_dev) calls release functions again, leading to use-after-free. Additionally, there are issues with loop bounds and releasing resources in other failure paths, although these do not currently cause problems due to the loop size. The fix involves correctly releasing all resources to prevent use-after-free.

Impact Analysis

This use-after-free vulnerability can lead to undefined behavior such as system crashes, memory corruption, or potential escalation of privileges if exploited. It affects the stability and security of the Linux kernel's media subsystem, potentially allowing attackers to execute arbitrary code or cause denial of service.

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