net/sched: fq_pie: clamp quantum in change path

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98013
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-25 11:17:29 UTC
Updated2026-09-25 11:17:29 UTC
DescriptionIn 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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected ec97ecf1ebe485a17cd8395a5f35e6b80b57665a f90fe65b977e7aa9eb302230a09eb18f8c32ceaa git Not specified
CNA Linux Linux affected ec97ecf1ebe485a17cd8395a5f35e6b80b57665a c11e3a39807eb5a200445ae9082843ab86800415 git Not specified
CNA Linux Linux affected ec97ecf1ebe485a17cd8395a5f35e6b80b57665a 6655b56e2801008566c594ef231f6c7b3f716c61 git Not specified
CNA Linux Linux affected ec97ecf1ebe485a17cd8395a5f35e6b80b57665a 4864f58c53eb47257d55e01f47d4a9f355f7f970 git Not specified
CNA Linux Linux affected 5.6 Not specified
CNA Linux Linux unaffected 5.6 semver Not specified
CNA Linux Linux unaffected 6.12.111 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.53 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.7 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/4864f58c53eb47257d55e01f47d4a9f355f7f970 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6655b56e2801008566c594ef231f6c7b3f716c61 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c11e3a39807eb5a200445ae9082843ab86800415 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f90fe65b977e7aa9eb302230a09eb18f8c32ceaa 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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