Description
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.
Product status
959466588aa7f84ccf79ae36a1d89542eaf9aaec (git) before 9a5fd5c2f4d4afdd5e405083ee53e0789ce76956
959466588aa7f84ccf79ae36a1d89542eaf9aaec (git) before 72c61ffbeeb8c50f6d4d70c65d3283aa1bac57a7
959466588aa7f84ccf79ae36a1d89542eaf9aaec (git) before a5efc95a33bd4fcb879250852828cc58c7862970
959466588aa7f84ccf79ae36a1d89542eaf9aaec (git) before 0475c85426b18eccdcb7f9fb58d8f8e9c6c58c87
959466588aa7f84ccf79ae36a1d89542eaf9aaec (git) before 9030a91235ae4845ec71902c3e0cecfc9ed1f2df
959466588aa7f84ccf79ae36a1d89542eaf9aaec (git) before d06476714d2819b550e0cc39222347e2c8941c9d
959466588aa7f84ccf79ae36a1d89542eaf9aaec (git) before c1175c4ad01dbc9c979d099861fa90a754f72059
959466588aa7f84ccf79ae36a1d89542eaf9aaec (git) before 51eb3b65544c9efd6a1026889ee5fb5aa62da3bb
4.14
Any version before 4.14
5.4.297 (semver)
5.10.241 (semver)
5.15.190 (semver)
6.1.138 (semver)
6.6.90 (semver)
6.12.28 (semver)
6.14.6 (semver)
6.15 (original_commit_for_fix)
References
lists.debian.org/debian-lts-announce/2025/10/msg00007.html
lists.debian.org/debian-lts-announce/2025/08/msg00010.html
git.kernel.org/...c/9a5fd5c2f4d4afdd5e405083ee53e0789ce76956
git.kernel.org/...c/72c61ffbeeb8c50f6d4d70c65d3283aa1bac57a7
git.kernel.org/...c/a5efc95a33bd4fcb879250852828cc58c7862970
git.kernel.org/...c/0475c85426b18eccdcb7f9fb58d8f8e9c6c58c87
git.kernel.org/...c/9030a91235ae4845ec71902c3e0cecfc9ed1f2df
git.kernel.org/...c/d06476714d2819b550e0cc39222347e2c8941c9d
git.kernel.org/...c/c1175c4ad01dbc9c979d099861fa90a754f72059
git.kernel.org/...c/51eb3b65544c9efd6a1026889ee5fb5aa62da3bb