CVE-2022-50317 - CVE House
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Status published Medium CVE-2022-50317

drm/bridge: megachips: Fix a null pointer dereference bug

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: drm/bridge: megachips: Fix a null pointer dereference bug When removing the module we will get the following warning: [ 31.911505] i2c-core: driver [stdp2690-ge-b850v3-fw] unregistered [ 31.912484] general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN PTI [ 31.913338] KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] [ 31.915280] RIP: 0010:drm_bridge_remove+0x97/0x130 [ 31.921825] Call Trace: [ 31.922533] stdp4028_ge_b850v3_fw_remove+0x34/0x60 [megachips_stdpxxxx_ge_b850v3_fw] [ 31.923139] i2c_device_remove+0x181/0x1f0 The two bridges (stdp2690, stdp4028) do not probe at the same time, so the driver does not call ge_b850v3_resgiter() when probing, causing the driver to try to remove the object that has not been initialized. Fix this by checking whether both the bridges are probed.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

References

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Affected Vendor

Affected Software

Linux
Vulnerable Versions:
7649972d97fb98578fbc4a351416cf72895e7c4d, 16e3827904932eccfba0915f0c93b519de3536ac, 50ad94f8654a53ec9ca3604a7a23cbaf166e0119, b8d10f601f226f055df8b5368d7ea7f369136cd5, 405856460d3e7aefb7c1aef047ec88fc4ef2e2a5, 11632d4aa2b3f126790e81a4415d6c23103cf8bb, e449461989f0674f188d30494ffd3f5ba74c1a05, 4.14.263, 4.19.226, 5.4.174, 5.10.94, 5.15.17, 5.16.3, 5.17, 0, 4.14.296, 4.19.262, 5.4.220, 5.10.150, 5.15.75, 5.19.17, 6.0.3, 6.1

Timeline

Official Publish: September 15th, 2025
Last Modified: May 23rd, 2026
Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weaknesses (CWE)

No CWE data available

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.