CVE-2022-50453: gpiolib: cdev: fix NULL-pointer dereferences
Vulnerability summary
CVE-2022-50453 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 5.4% 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 7 · Related 5Timeline
- 01-10-2025PublishedVulnerability first disclosed.
- 11-05-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: gpiolib: cdev: fix NULL-pointer dereferences There are several places where we can crash the kernel by requesting lines, unbinding the GPIO device, then calling any of the system calls relevant to the GPIO character device's annonymous file descriptors: ioctl(), read(), poll(). While I observed it with the GPIO simulator, it will also happen for any of the GPIO devices that can be hot-unplugged - for instance any HID GPIO expander (e.g. CP2112). This affects both v1 and v2 uAPI. This fixes it partially by checking if gdev->chip is not NULL but it doesn't entirely remedy the situation as we still have a race condition in which another thread can remove the device after the check.
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.
Ubuntu119 products
- linuxAll versions (No fix recorded) | < 5.15.0-69.76
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 5.15.0-1033.37
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ d7c51b47ac11e66f547b55640405c1c474642d72, < 6d79546622baab843172b52c3af035f83c1b21df | ≥ d7c51b47ac11e66f547b55640405c1c474642d72, < 7c755a2d6df511eeb5afba966ac28140f9ea5063 | ≥ d7c51b47ac11e66f547b55640405c1c474642d72, < d66f68ac9e7ba46b6b90fbe25155723f2126088a | ≥ d7c51b47ac11e66f547b55640405c1c474642d72, < ac6ce3cd7a3e10a2e37b8970bab81b4d33d5cfc3 | ≥ d7c51b47ac11e66f547b55640405c1c474642d72, < 533aae7c94dbc2b14301cfd68ae7e0e90f0c8438 | 4.8
- linux_kernel≥ 4.8, < 5.10.163 | ≥ 5.11, < 5.15.86 | ≥ 5.16, < 6.0.16 | ≥ 6.1, < 6.1.2
Debian1 product
- linux< 6.1.4-1
3 vendors · 122 products
