CVE-2025-38177
sch_hfsc: make hfsc_qlen_notify() idempotent
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| Vendor | linux |
| Product | linux |
| Ecosystems | |
| Industries | Technology |
| Published | Jul 4, 2025 |
| Last Updated | May 11, 2026 |
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Affected Versions
Linux / Linux
959466588aa7f84ccf79ae36a1d89542eaf9aaec < 9a5fd5c2f4d4afdd5e405083ee53e0789ce76956 959466588aa7f84ccf79ae36a1d89542eaf9aaec < 72c61ffbeeb8c50f6d4d70c65d3283aa1bac57a7 959466588aa7f84ccf79ae36a1d89542eaf9aaec < a5efc95a33bd4fcb879250852828cc58c7862970 959466588aa7f84ccf79ae36a1d89542eaf9aaec < 0475c85426b18eccdcb7f9fb58d8f8e9c6c58c87 959466588aa7f84ccf79ae36a1d89542eaf9aaec < 9030a91235ae4845ec71902c3e0cecfc9ed1f2df 959466588aa7f84ccf79ae36a1d89542eaf9aaec < d06476714d2819b550e0cc39222347e2c8941c9d 959466588aa7f84ccf79ae36a1d89542eaf9aaec < c1175c4ad01dbc9c979d099861fa90a754f72059 959466588aa7f84ccf79ae36a1d89542eaf9aaec < 51eb3b65544c9efd6a1026889ee5fb5aa62da3bb
Linux / Linux
4.14
References
git.kernel.org: https://git.kernel.org/stable/c/9a5fd5c2f4d4afdd5e405083ee53e0789ce76956 git.kernel.org: https://git.kernel.org/stable/c/72c61ffbeeb8c50f6d4d70c65d3283aa1bac57a7 git.kernel.org: https://git.kernel.org/stable/c/a5efc95a33bd4fcb879250852828cc58c7862970 git.kernel.org: https://git.kernel.org/stable/c/0475c85426b18eccdcb7f9fb58d8f8e9c6c58c87 git.kernel.org: https://git.kernel.org/stable/c/9030a91235ae4845ec71902c3e0cecfc9ed1f2df git.kernel.org: https://git.kernel.org/stable/c/d06476714d2819b550e0cc39222347e2c8941c9d git.kernel.org: https://git.kernel.org/stable/c/c1175c4ad01dbc9c979d099861fa90a754f72059 git.kernel.org: https://git.kernel.org/stable/c/51eb3b65544c9efd6a1026889ee5fb5aa62da3bb lists.debian.org: https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html lists.debian.org: https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html