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CVE-2026-23236: fbdev: smscufx: properly copy ioctl memory to kernelspace

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-04 · updated 2026-06-17

Description

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.

Affected products

• Linux kernel: from 3.2 before 5.10.251; from 5.11 before 5.15.201; from 5.16 before 6.1.164; from 6.2 before 6.6.127; from 6.7 before 6.12.74; from 6.13 before 6.18.13 — fixed in 5.10.251, 5.15.201, 6.1.164, 6.12.74, 6.18.13, 6.19.3

How to fix

Upgrade to a fixed version: Linux kernel 5.10.251, 5.15.201, 6.1.164, 6.12.74. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/061cfeb560aa3ddc174153dbe5be9d0b55eb7248
• https://git.kernel.org/stable/c/0634e8d650993602fc5b389ff7ac525f6542e141
• https://git.kernel.org/stable/c/120adae7b42faa641179270c067864544a50ab69
• https://git.kernel.org/stable/c/1c008ad0f0d1c1523902b9cdb08e404129677bfc
• https://git.kernel.org/stable/c/52917e265aa5f848212f60fc50fc504d8ef12866
• https://git.kernel.org/stable/c/6167af934f956d3ae1e06d61f45cd0d1004bbe1a
• https://git.kernel.org/stable/c/a0321e6e58facb39fe191caa0e52ed9aab6a48fe
• https://git.kernel.org/stable/c/f1e91bd4efeae48b0f42caed7e8ce2e3a0d05b02
• https://cert-portal.siemens.com/productcert/html/ssa-253495.html

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