sch_htb: make htb_qlen_notify() idempotent
In the Linux kernel, the following vulnerability has been resolved: sch_htb: make htb_qlen_notify() idempotent htb_qlen_notify() always deactivates the HTB class and in fact could trigger a warning if it is already deactivated. Therefore, it is not idempotent and not friendly to its callers, like fq_codel_dequeue(). Let's make it idempotent to ease qdisc_tree_reduce_backlog() callers' life.
02 / AFFECTED SOFTWARE
Affected packages
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
In the Linux kernel, the following vulnerability has been resolved: sch_htb: make htb_qlen_notify() idempotent htb_qlen_notify() always deactivates the HTB class and in fact could trigger a warning if it is already deactivated. Therefore, it is not idempotent and not friendly to its callers, like fq_codel_dequeue(). Let's make it idempotent to ease qdisc_tree_reduce_backlog() callers' life.
05 / REFERENCES
Further evidence
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- https://git.kernel.org/stable/c/0a188c0e197383683fd093ab1ea6ce9a5869a6ea
- https://git.kernel.org/stable/c/32ae12ce6a9f6bace186ca7335220ff59b6cc3cd
- https://git.kernel.org/stable/c/5ba8b837b522d7051ef81bacf3d95383ff8edce5
- https://git.kernel.org/stable/c/73cf6af13153d62f9b76eff422eea79dbc70f15e
- https://git.kernel.org/stable/c/967955c9e57f8eebfccc298037d4aaf3d42bc1c9
- https://git.kernel.org/stable/c/a61f1b5921761fbaf166231418bc1db301e5bf59
- https://git.kernel.org/stable/c/bbbf5e0f87078b715e7a665d662a2c0e77f044ae
- https://git.kernel.org/stable/c/e6b45f4de763b00dc1c55e685e2dd1aaf525d3c1
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/37xxx/CVE-2025-37932.json
- https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
- https://nvd.nist.gov/vuln/detail/CVE-2025-37932