Answer in brief
CVE-2025-38177 records a High severity (CVSS 7.8) vulnerability in sch_hfsc: make hfsc_qlen_notify() idempotent. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=959466588aa7f84ccf79ae36a1d89542eaf9aaec <9a5fd5c2f4d4afdd5e405083ee53e0789ce76956 || >=959466588aa7f84ccf79ae36a1d89542eaf9aaec <72c61ffbeeb8c50f6d4d70c65d3283aa1bac57a7 || >=959466588aa7f84ccf79ae36a1d89542eaf9aaec <a5efc95a33bd4fcb879250852828cc58c7862970 || >=959466588aa7f84ccf79ae36a1d89542eaf9aaec <0475c85426b18eccdcb7f9fb58d8f8e9c6c58c87 || >=959466588aa7f84ccf79ae36a1d89542eaf9aaec <9030a91235ae4845ec71902c3e0cecfc9ed1f2df || >=959466588aa7f84ccf79ae36a1d89542eaf9aaec <d06476714d2819b550e0cc39222347e2c8941c9d || >=959466588aa7f84ccf79ae36a1d89542eaf9aaec <c1175c4ad01dbc9c979d099861fa90a754f72059 || >=959466588aa7f84ccf79ae36a1d89542eaf9aaec <51eb3b65544c9efd6a1026889ee5fb5aa62da3bb | 9a5fd5c2f4d4afdd5e405083ee53e0789ce76956, 72c61ffbeeb8c50f6d4d70c65d3283aa1bac57a7, a5efc95a33bd4fcb879250852828cc58c7862970, 0475c85426b18eccdcb7f9fb58d8f8e9c6c58c87, 9030a91235ae4845ec71902c3e0cecfc9ed1f2df, d06476714d2819b550e0cc39222347e2c8941c9d, c1175c4ad01dbc9c979d099861fa90a754f72059, 51eb3b65544c9efd6a1026889ee5fb5aa62da3bb |
| Linux/Linuxgeneric | 4.14 | Not reported |
Published upstream
Jul 4, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
In the Linux kernel, the following vulnerability has been resolved: sch_hfsc: make hfsc_qlen_notify() idempotent hfsc_qlen_notify() is not idempotent either and not friendly to its callers, like fq_codel_dequeue(). Let's make it idempotent to ease qdisc_tree_reduce_backlog() callers' life: 1. update_vf() decreases cl->cl_nactive, so we can check whether it is non-zero before calling it. 2. eltree_remove() always removes RB node cl->el_node, but we can use RB_EMPTY_NODE() + RB_CLEAR_NODE() to make it safe.
Quoted source text, attributed separately from HOL analysis.