CVE-2025-38177
High
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.
SeverityHigh
CVSS7.8
Exploit probability—
Product
Linux Kernel
PublishedJul 4, 2025
First seenJul 4, 2025
How to fix
Update
- linux linux_kernel5.4.297, 5.10.241, 5.15.190, 6.1.138, 6.6.90, 6.12.28, 6.14.6 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | v < 5.4.297, 5.5 ≤ v < 5.10.241, 5.11 ≤ v < 5.15.190, 5.16 ≤ v < 6.1.138, 6.2 ≤ v < 6.6.90, 6.7 ≤ v < 6.12.28, 6.13 ≤ v < 6.14.6, 6.15 | 5.4.297, 5.10.241, 5.15.190, 6.1.138, 6.6.90, 6.12.28, 6.14.6 |
| debian debian_linux | 11.0 | — |
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