hfsc qdisc

About this tag
The hfsc qdisc tag on WindowsForum.com covers the Hierarchical Fair Service Curve packet scheduler in Linux traffic control. Recent discussions focus on CVE-2025-38177, a timing-and-lifecycle bug in sch_hfsc that could lead to kernel use-after-free due to a non-idempotent qlen_notify pathway. The upstream fix makes hfsc_qlen_notify idempotent. Topics include backport impact, risk prioritization in multi-tenant cloud and appliance environments, and operator remediation steps. While the site is Windows-focused, this tag addresses Linux kernel networking issues relevant to cross-platform IT professionals.

  1. Linux HFSC CVE-2025-38177: Idempotent qlen_notify Patch and Backport Impact

    A timing-and-lifecycle bug in the Linux traffic‑control scheduler (sch_hfsc) has been assigned CVE‑2025‑38177 after upstream maintainers patched a non‑idempotent qlen_notify pathway that could leave parent qdiscs operating on stale class pointers and, in the worst case, trigger a kernel...
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    • cve 2025 38177 hfsc qdisc linux kernel patch backport
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    • Forum: Security Alerts