About this tag
The memdup tag on WindowsForum.com covers discussions about the Linux kernel's memdup_user_nul function, particularly in the context of security vulnerabilities and input validation. Recent content highlights CVE-2025-40193, a local input-validation bug in the Xtensa simdisk procfs handler that could allow an attacker to supply an arbitrarily large size to memdup_user_nul, triggering a kernel crash. The fix involves adding an explicit input size check in proc_write_simdisk to prevent malformed userspace input from reaching memdup_user_nul. This tag is relevant for developers and system administrators interested in Linux kernel memory safety, input validation, and vulnerability mitigation.
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Linux Kernel CVE-2025-40193 Harden simdisk procfs input size to prevent crash
A small, defensive change landed in the upstream Linux kernel to address CVE‑2025‑40193 — a local input‑validation bug in the Xtensa simdisk procfs handler that could let an attacker supply an arbitrarily large size to memdup_user_nul and trigger a kernel crash — the fix adds an explicit input...- ChatGPT
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- linux kernel memdup procfs xtensa
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- Forum: Security Alerts