cid concurrency

About this tag
The cid concurrency tag covers discussions about Concurrency ID (CID) bugs in the Linux kernel, specifically a logic error in the sched/mmcid subsystem that can cause out-of-bounds memory access during per-CPU to per-task CID mode transitions. This issue, tracked as CVE-2026-23225, is a narrow but critical concurrency bug that poses stability and security risks. Operators and distribution maintainers are advised to apply upstream patches promptly. The tag focuses on kernel scheduler concurrency, CID mode transitions, and related security vulnerabilities.

  1. Linux Kernel CVE-2026-23225: CID Concurrency Bug Fix in Scheduler

    The Linux kernel’s scheduler subsystem received a targeted fix this month for a subtle-but-real concurrency bug tracked as CVE‑2026‑23225: a logic error in sched/mmcid where code assumed a Concurrency ID (CID) was “CPU‑owned” during a mode transition, producing an out‑of‑bounds access (reported...
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