comedi

About this tag
The comedi tag covers security vulnerabilities and fixes in the Linux kernel's COMEDI (Control and Measurement Device Interface) subsystem. Recent discussions focus on CVEs such as CVE-2025-38481, CVE-2025-38480, CVE-2025-38483, CVE-2025-38478, and CVE-2025-68257, which involve issues like excessive kernel buffer allocation, uninitialized data reads, out-of-bounds shifts, and NULL-pointer crashes. Microsoft's Azure Linux is noted as potentially affected by some of these flaws. The content emphasizes upstream kernel patches, stable kernel updates, and the importance of applying fixes to systems using COMEDI for data acquisition and instrumentation.

  1. CVE-2025-38481: Linux Comedi Buffer Fix in Azure Linux

    The Linux kernel vulnerability tracked as CVE-2025-38481 — a bug in the comedi subsystem that causes the COMEDI_INSNLIST ioctl to allocate an unreasonably large kernel buffer when given a maliciously large n_insns value — has been fixed upstream by adding a limit (MAX_INSNS) and by refusing...
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    • azure linux comedi linux kernel vulnerability management
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    • Forum: Security Alerts

  2. CVE-2025-38480: Linux COMEDI Kernel Fix for Uninitialized Data

    The Linux kernel vulnerability tracked as CVE-2025-38480 has been published: a subtle correctness bug in the COMEDI subsystem where the helper function insn_rw_emulate_bits could read uninitialized data when presented with an instruction that specifies zero samples. Upstream kernel maintainers...
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    • comedi kernel patch linux kernel security advisory
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    • Forum: Security Alerts

  3. CVE-2025-38483: Linux COMEDI das16m1 IRQ Bound Check Patch

    The Linux kernel CVE-2025-38483 disclosure fixes a small but meaningful defensive-programming error in the COMEDI das16m1 driver that could lead to an out‑of‑bounds left-shift when a user-supplied IRQ number is used without sanity checks. The upstream patch enforces explicit bounds on the...
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    • comedi linux kernel patch management vulnerability
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    • Forum: Security Alerts

  4. CVE-2025-38478 Explained: Azure Linux Attestation and the comedi Bug

    Microsoft’s terse advisory that “Azure Linux includes this open‑source library and is therefore potentially affected” is accurate but incomplete as an operational statement — it is a product‑level attestation, not proof that every other Microsoft product is free of the same vulnerable component...

  5. CVE-2025-68257 Hardened Linux COMEDI compat ioctls to prevent NULL pointer crash

    A newly assigned CVE, CVE-2025-68257, closes a subtle but dangerous gap in the Linux kernel’s COMEDI driver by ensuring compat ioctl handlers verify whether a device is actually attached before performing operations — a change that eliminates a reproducible NULL-pointer kernel crash reported by...
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    • comedi compat ioctls kernel security linux kernel
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    • Forum: Security Alerts