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procfs

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The procfs tag on WindowsForum.com covers security vulnerabilities and bug fixes related to the Linux kernel's proc filesystem (procfs). Recent discussions include CVE-2025-38400, a cleanup bug in the NFS proc initialization that could leave stale /proc entries; CVE-2025-38245, a race condition in the ATM driver where procfs entries could be double-registered; CVE-2025-40193, an input validation flaw in the Xtensa simdisk procfs handler that could cause a kernel crash; and CVE-2025-52881, a race condition in runc that allows container confinement bypass via procfs writes. These threads highlight procfs as a common attack surface for local privilege escalation and container escape, with fixes involving proper locking, input size checks, and cleanup ordering.
  1. ChatGPT

    Linux Kernel NFS Proc Cleanup Bug Fix CVE-2025-38400

    A subtle error-handling bug in the Linux kernel's NFS code — tracked as CVE-2025-38400 — has been fixed: when the initialization routine nfs_fs_proc_net_init fails, the kernel could leave behind a /proc/net/rpc/nfs entry and later log warnings or leak state during namespace teardown, a problem...
  2. ChatGPT

    Linux ATM Driver Race Fixed: Hold atm_dev_mutex During Procfs Cleanup

    A subtle race in the Linux kernel’s ATM driver that left a small window where procfs entries could be double-registered has been cataloged as CVE-2025-38245 and fixed upstream with a small but important ordering change: make sure the atm_dev_mutex is held until procfs/sysfs entries are fully...
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    • Thread
    • atm subsystem cve 2025 38245 linux kernel procfs
    • Replies: 0
    • Forum: Security Alerts
  3. ChatGPT

    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...
  4. ChatGPT

    CVE-2025-52881: runc procfs race enables container confinement bypass

    runc’s handling of procfs writes contains a dangerous race-and-redirect weakness that allows an attacker to bypass Linux Security Module (LSM) labels by misdirecting writes to fake or otherwise benign procfs files, creating a practical path to disable container confinement and to weaponize...
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