procfs vulnerability

About this tag
The procfs vulnerability tag covers Linux kernel flaws in the proc filesystem, including buffer sizing errors and use-after-free races. Recent discussions highlight CVE-2026-31630, an off-by-one in AF_RXRPC procfs code where IPv6 addresses overflow fixed buffers, and CVE-2025-21999, a use-after-free race between module removal and inode creation. These vulnerabilities pose risks of kernel crashes or memory corruption, with fixes involving targeted patches to remove unsafe dereferences or adjust buffer sizes. Administrators should assess exposure based on kernel commits and distribution advisories.

  1. CVE-2026-31630: Linux Kernel Procfs Off-By-One Fix and Buffer Sizing Lesson

    CVE-2026-31630 is a small-looking Linux kernel fix with a larger lesson: buffer sizing still matters, even in diagnostic paths that most users never touch. The flaw sits in the AF_RXRPC procfs code, where socket addresses were formatted into fixed 50-byte stack buffers even though a current...
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    • buffer sizing cve-2026-31630 linux kernel security procfs vulnerability
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    • Forum: Security Alerts

  2. Linux Kernel CVE-2025-21999 Fix for Proc Use After Free Race

    A newly disclosed Linux-kernel vulnerability, tracked as CVE‑2025‑21999, patches a use‑after‑free (UAF) race in the proc filesystem: a race between module removal (rmmod) and inode creation in proc_get_inode() could let the kernel dereference a freed module pointer and crash or corrupt kernel...
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    • cve 2025 21999 linux kernel procfs vulnerability use-after-free
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    • Forum: Security Alerts