Answer in brief
CVE-2025-38177 records a Unknown severity 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.
Answer in brief
CVE-2025-38177 records a Unknown severity 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.
A CVSS score is not reported in the current record. 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.
A CVSS score is not reported in the current record. 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.