CVE-2022-50317

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

MEDIUM

5.5

CVSS Score

Published: September 15, 2025 at 02:48 PM UTC

Updated: June 17, 2026 at 05:23 AM UTC

1 product affected across 1 vendorLinux Kernel

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Severity

MEDIUM5.5

Exploit prediction

EPSS 0.2%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

95%

v ≥ 5.16.34.14.263 ≤ v < 4.14.2964.19.226 ≤ v < 4.19.2625.10.94 ≤ v < 5.10.1505.15.17 ≤ v < 5.15.755.16.3 ≤ v < 5.175.16.3 ≤ v < 5.19.175.17 ≤ v < 5.19.175.17 ≤ v < 6.0.35.17 ≤ v < 6.15.4.174 ≤ v < 5.4.2206.0 ≤ v < 6.0.311632d4aa2b3f126790e81a4415d6c23103cf8bb16e3827904932eccfba0915f0c93b519de3536ac4.14.263 4.19.226405856460d3e7aefb7c1aef047ec88fc4ef2e2a55.10.94 5.15.17 5.16.3 5.17 5.4.17450ad94f8654a53ec9ca3604a7a23cbaf166e01197649972d97fb98578fbc4a351416cf72895e7c4db8d10f601f226f055df8b5368d7ea7f369136cd5e449461989f0674f188d30494ffd3f5ba74c1a05

Vendor states this is fixed in 1daf69228e310938177119c4eadcd30fc75c81e0 (fixed)

Vendor states this is fixed in 1ff673333d46d2c1b053ebd0c1c7c7c79e36943e (fixed)

Vendor states this is fixed in 21764467ab396d9f08921e0a5ffa1214244e1ad9 (fixed)

Vendor states this is fixed in 4610e7a4111fa3f3ce27c09d6d94008c55f1cd31 (fixed)

Vendor states this is fixed in 5bc20bafcd87ba0858ab772cefc7047cb51bc249 (fixed)

Vendor states this is fixed in 7371fad5cfe6eada6bb5523c895fd6074b15c2b9 (fixed)

Vendor states this is fixed in 877e92e9b1bdeb580b31a46061005936be902cd4 (fixed)

Vendor states this is fixed in aaa512ad1e59f2edf8a9e4f2b167a44b24670679 (fixed)

Vendor states this is fixed in 4.14.296 (unaffected)

Vendor states this is fixed in 4.19.262 (unaffected)

Vendor states this is fixed in 5.10.150 (unaffected)

Vendor states this is fixed in 5.15.75 (unaffected)