UNKNOWN NVD
CVE-2026-98013
In the Linux kernel, the following vulnerability has been resolved: net/sched: fq_pie: clamp quantum in change path fq_pie_change() accepts any quantum value
In the Linux kernel, the following vulnerability has been resolved:
net/sched: fq_pie: clamp quantum in change path
fq_pie_change() accepts any quantum value from userspace, including 1.
With a crafted size table qdisc_pkt_len reaches ~2 GiB, so quantum=1
makes the deficit-refill loop spin ~2^31 times under the qdisc lock
(a soft lockup / denial of service).
Add max(256U, ...) matching fq_codel_change().
Conditions to recreate the bug:
CONFIG_NET_SCH_FQ_PIE=y. Requires CAP_NET_ADMIN (namespace-local via
unshare -Urn suffices).
tc qdisc add dev dummy0 root fq_pie
tc qdisc change dev dummy0 root fq_pie quantum 1 stab data 32768 size_log 15 cell_log 0
References
- https://git.kernel.org/stable/c/4864f58c53eb47257d55e01f47d4a9f355f7f970
- https://git.kernel.org/stable/c/6655b56e2801008566c594ef231f6c7b3f716c61
- https://git.kernel.org/stable/c/c11e3a39807eb5a200445ae9082843ab86800415
- https://git.kernel.org/stable/c/f90fe65b977e7aa9eb302230a09eb18f8c32ceaa
This unknown severity vulnerability was published on 2026-09-25 via NVD.
vulnfeed aggregates 11443 vulnerabilities from NVD, CISA KEV,
Ubuntu, Debian, Red Hat, Kubernetes, Exploit-DB, OSS-Security, GitHub and OpenStack — updated every 4 hours.