CVE-2022-50317: drm/bridge: megachips: Fix a null pointer dereference bug
Vulnerability summary
CVE-2022-50317 is a medium (CVSS 5.5) NULL Pointer Dereference vulnerability in linux. EPSS estimates a 0.16% chance of exploitation in the next 30 days, higher than 5.1% of scored vulnerabilities.
Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 8 · Related 6Timeline
- 15-09-2025PublishedVulnerability first disclosed.
- 23-05-2026Last modifiedVulnerability information updated.
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.
CVSS metrics
3 scores · 3 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.16%
Chance of exploitation in the next 30 days
Percentile
5%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.16% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu118 products
- linux< 4.15.0-204.215 | < 5.4.0-139.156 | < 5.15.0-60.66
- linux-allwinner-5.19All versions (No fix recorded)
- linux-aws< 4.15.0-1150.163 | < 5.4.0-1096.104 | < 5.15.0-1030.34
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ 7649972d97fb98578fbc4a351416cf72895e7c4d, < aaa512ad1e59f2edf8a9e4f2b167a44b24670679 | ≥ 16e3827904932eccfba0915f0c93b519de3536ac, < 5bc20bafcd87ba0858ab772cefc7047cb51bc249 | ≥ 50ad94f8654a53ec9ca3604a7a23cbaf166e0119, < 1daf69228e310938177119c4eadcd30fc75c81e0 | ≥ b8d10f601f226f055df8b5368d7ea7f369136cd5, < 877e92e9b1bdeb580b31a46061005936be902cd4 | ≥ 405856460d3e7aefb7c1aef047ec88fc4ef2e2a5, < 4610e7a4111fa3f3ce27c09d6d94008c55f1cd31 | ≥ 11632d4aa2b3f126790e81a4415d6c23103cf8bb, < 21764467ab396d9f08921e0a5ffa1214244e1ad9 | ≥ 11632d4aa2b3f126790e81a4415d6c23103cf8bb, < 7371fad5cfe6eada6bb5523c895fd6074b15c2b9 | ≥ 11632d4aa2b3f126790e81a4415d6c23103cf8bb, < 1ff673333d46d2c1b053ebd0c1c7c7c79e36943e | e449461989f0674f188d30494ffd3f5ba74c1a05 | ≥ 4.14.263, < 4.14.296 | ≥ 4.19.226, < 4.19.262 | ≥ 5.4.174, < 5.4.220 | ≥ 5.10.94, < 5.10.150 | ≥ 5.15.17, < 5.15.75 | ≥ 5.16.3, < 5.17 | 5.17
- linux_kernel≥ 4.14.263, < 4.14.296 | ≥ 4.19.226, < 4.19.262 | ≥ 5.4.174, < 5.4.220 | ≥ 5.10.94, < 5.10.150 | ≥ 5.15.17, < 5.15.75 | ≥ 5.16.3, < 5.19.17 | ≥ 6.0, < 6.0.3
Debian1 product
- linux< 6.0.3-1
3 vendors · 121 products
