CVE-2021-47652: video: fbdev: smscufx: Fix null-ptr-deref in ufx_usb_probe()
Vulnerability summary
CVE-2021-47652 is a medium (CVSS 5.5) NULL Pointer Dereference vulnerability in linux. EPSS estimates a 0.26% chance of exploitation in the next 30 days, higher than 17.7% 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 7Timeline
- 26-02-2025PublishedVulnerability first disclosed.
- 11-05-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: video: fbdev: smscufx: Fix null-ptr-deref in ufx_usb_probe() I got a null-ptr-deref report: BUG: kernel NULL pointer dereference, address: 0000000000000000 ... RIP: 0010:fb_destroy_modelist+0x38/0x100 ... Call Trace: ufx_usb_probe.cold+0x2b5/0xac1 [smscufx] usb_probe_interface+0x1aa/0x3c0 [usbcore] really_probe+0x167/0x460 ... ret_from_fork+0x1f/0x30 If fb_alloc_cmap() fails in ufx_usb_probe(), fb_destroy_modelist() will be called to destroy modelist in the error handling path. But modelist has not been initialized yet, so it will result in null-ptr-deref. Initialize modelist before calling fb_alloc_cmap() to fix this bug.
CVSS metrics
5 scores · 4 sources · 2 versions- 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
- NVDNIST5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.26%
Chance of exploitation in the next 30 days
Percentile
18%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.26% 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.
Ubuntu106 products
- linuxAll versions (No fix recorded) | < 4.15.0-189.200 | < 5.4.0-117.132 | < 5.15.0-37.39
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 4.15.0-1137.148 | < 5.4.0-1078.84 | < 5.15.0-1011.14
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ 3c8a63e22a0802fd56380f6ab305b419f18eb6f5, < d1b6a1f0c23b7164250479bf92e2893291dca539 | ≥ 3c8a63e22a0802fd56380f6ab305b419f18eb6f5, < 0fd28daec73525382e5c992db8743bf76e42cd5c | ≥ 3c8a63e22a0802fd56380f6ab305b419f18eb6f5, < dd3a6cc7385b89ec2303f39dfc3bafa4e24cec4b | ≥ 3c8a63e22a0802fd56380f6ab305b419f18eb6f5, < da8b269cc0a2526ebeaccbe2484c999eb0f822cf | ≥ 3c8a63e22a0802fd56380f6ab305b419f18eb6f5, < 64ec3e678d76419f207b9cdd338dda438ca10b1c | ≥ 3c8a63e22a0802fd56380f6ab305b419f18eb6f5, < c420b540db4b5d69de0a36d8b9d9a6a79a04f05a | ≥ 3c8a63e22a0802fd56380f6ab305b419f18eb6f5, < d396c651e2b508b6179bb678cc029f3becbf5170 | ≥ 3c8a63e22a0802fd56380f6ab305b419f18eb6f5, < 9280ef235b05e8f19f8bc6d547b992f0a0ef398d | ≥ 3c8a63e22a0802fd56380f6ab305b419f18eb6f5, < 1791f487f877a9e83d81c8677bd3e7b259e7cb27 | 3.2
- linux_kernel≥ 3.2, < 4.9.311 | ≥ 4.10, < 4.14.276 | ≥ 4.15, < 4.19.238 | ≥ 4.20, < 5.4.189 | ≥ 5.5, < 5.10.110 | ≥ 5.11, < 5.15.33 | ≥ 5.16, < 5.16.19 | ≥ 5.17, < 5.17.2
Debian1 product
- linux< 5.17.3-1
3 vendors · 109 products
