CVE-2022-50317: linux kernel Null Dereference — Fix

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.

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CVSS v3.1 Score

5.5

MEDIUM

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

Weakness Type (CWE)

CWE-476 CWE-476

Affected Products

Vendor	Product	Versions
linux	linux_kernel	4.14.263 — 4.14.296
linux	linux_kernel	4.19.226 — 4.19.262
linux	linux_kernel	5.4.174 — 5.4.220
linux	linux_kernel	5.10.94 — 5.10.150
linux	linux_kernel	5.15.17 — 5.15.75
linux	linux_kernel	5.16.3 — 5.19.17
linux	linux_kernel	6.0 — 6.0.3

References

Advisories & Patches

https://git.kernel.org/stable/c/1daf69228e310938177119c4eadcd30fc75c81e0 https://git.kernel.org/stable/c/1ff673333d46d2c1b053ebd0c1c7c7c79e36943e https://git.kernel.org/stable/c/21764467ab396d9f08921e0a5ffa1214244e1ad9 https://git.kernel.org/stable/c/4610e7a4111fa3f3ce27c09d6d94008c55f1cd31 https://git.kernel.org/stable/c/5bc20bafcd87ba0858ab772cefc7047cb51bc249 https://git.kernel.org/stable/c/7371fad5cfe6eada6bb5523c895fd6074b15c2b9 https://git.kernel.org/stable/c/877e92e9b1bdeb580b31a46061005936be902cd4 https://git.kernel.org/stable/c/aaa512ad1e59f2edf8a9e4f2b167a44b24670679

Frequently Asked Questions

What is CVE-2022-50317? +

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. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2022-50317? +

CVE-2022-50317 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2022-50317? +

CVE-2022-50317 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2022-50317? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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