CVE-2026-98013

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Source
https://cve.org/CVERecord?id=CVE-2026-98013
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-98013.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-98013
Downstream
Related
Published
2026-09-25T10:23:36Z
Modified
2026-10-09T17:26:54Z
Summary
net/sched: fq_pie: clamp quantum in change path
Details

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

Database specific 
{
    "cna_assigner":  "Linux",
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98013.json"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
ec97ecf1ebe485a17cd8395a5f35e6b80b57665a
Fixed
ff4f3a0f3abd2ded467931d7da7984a68a768e0b
Fixed
749aaebc1eb92ce2f38fd3caf68a2f99686d84ef
Fixed
8fd98e56c41f79278eeb67512c28d7abc175bcf4
Fixed
215df1e953ae72a09d425ec188e054058ae23dc9
Fixed
f90fe65b977e7aa9eb302230a09eb18f8c32ceaa
Fixed
c11e3a39807eb5a200445ae9082843ab86800415
Fixed
6655b56e2801008566c594ef231f6c7b3f716c61
Fixed
4864f58c53eb47257d55e01f47d4a9f355f7f970

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-98013.json"

Linux / Kernel

Package

Name
Kernel

Affected ranges

Type
ECOSYSTEM
Events
Introduced
5.6.0
Fixed
5.10.271
Type
ECOSYSTEM
Events
Introduced
5.11.0
Fixed
5.15.222
Type
ECOSYSTEM
Events
Introduced
5.16.0
Fixed
6.1.189
Type
ECOSYSTEM
Events
Introduced
6.2.0
Fixed
6.6.158
Type
ECOSYSTEM
Events
Introduced
6.7.0
Fixed
6.12.111
Type
ECOSYSTEM
Events
Introduced
6.13.0
Fixed
6.18.53
Type
ECOSYSTEM
Events
Introduced
6.19.0
Fixed
7.2.7

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-98013.json"