Bug 2444387 (CVE-2026-23236)

Summary: CVE-2026-23236 kernel: fbdev: smscufx: properly copy ioctl memory to kernelspace
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: unspecifiedKeywords: Security
Target Milestone: ---   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: ---
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-03-04 15:01:29 UTC 
In the Linux kernel, the following vulnerability has been resolved:

fbdev: smscufx: properly copy ioctl memory to kernelspace

The UFX_IOCTL_REPORT_DAMAGE ioctl does not properly copy data from
userspace to kernelspace, and instead directly references the memory,
which can cause problems if invalid data is passed from userspace.  Fix
this all up by correctly copying the memory before accessing it within
the kernel.
Comment 1 Alexander B 2026-03-04 15:29:39 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026030440-CVE-2026-23236-b419@gregkh/T