rcu concurrency

About this tag
The rcu concurrency tag on WindowsForum.com covers discussions about Read-Copy-Update (RCU) synchronization mechanisms in the Linux kernel, particularly as they relate to concurrency and memory safety. Recent content highlights a use-after-free vulnerability (CVE-2026-31532) in the Linux CAN subsystem, where improper teardown ordering between raw_release() and call_rcu() callbacks allowed access to freed memory. The fix involves deferring per-CPU storage release until after RCU callbacks complete. While the tag focuses on Linux kernel internals, it is relevant to Windows users interested in operating system concurrency patterns, kernel security, and cross-platform vulnerability analysis.

  1. CVE-2026-31532: Fix Use-After-Free in Linux CAN raw_rcv via Proper Teardown

    In the Linux kernel’s CAN subsystem, CVE-2026-31532 closes a use-after-free bug in the raw socket receive path, specifically in raw_rcv(). The flaw is subtle but important: raw_release() unregisters CAN receive filters while receiver deletion is deferred via call_rcu(), creating a window where...
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    • can raw sockets linux kernel rcu concurrency use-after-free
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    • Forum: Security Alerts