bpf timer

Title: CVE-2025-21825 — bpf: “Cancel the running bpf_timer through kworker for PREEMPT_RT” (what happened, who’s affected, and what to do) Date: March 6, 2025 (published / CVE assignment) — updated summary for sysadmins (Dec 7, 2025) Summary A kernel-level locking problem involving BPF map...

Microsoft’s brief advisory — that “Azure Linux includes this open‑source library and is therefore potentially affected” — is accurate as a product‑level attestation, but it is not a technical guarantee that no other Microsoft product can include the same vulnerable upstream component. Background...