CVE-2026-98013net/sched: fq_pie: clamp quantum in change path
- —Not scoredno CVSS score yet
- 0.18%Exploitation in 30 daysEPSS · top 93% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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
Timeline
ID reserved
By Linux
Published
- 24 days later
· 24 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.
- EPSS (exploitation in 30 days)
- 0.18% · top 93% of all CVEs (15 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected ec97ecf1ebe485a17cd8395a5f35e6b80b57665a – < ff4f3a0f3abd2ded467931d7da7984a68a768e0b
- affected ec97ecf1ebe485a17cd8395a5f35e6b80b57665a – < 749aaebc1eb92ce2f38fd3caf68a2f99686d84ef
- affected ec97ecf1ebe485a17cd8395a5f35e6b80b57665a – < 8fd98e56c41f79278eeb67512c28d7abc175bcf4
- affected ec97ecf1ebe485a17cd8395a5f35e6b80b57665a – < 215df1e953ae72a09d425ec188e054058ae23dc9
- affected ec97ecf1ebe485a17cd8395a5f35e6b80b57665a – < f90fe65b977e7aa9eb302230a09eb18f8c32ceaa
- affected ec97ecf1ebe485a17cd8395a5f35e6b80b57665a – < c11e3a39807eb5a200445ae9082843ab86800415
- affected ec97ecf1ebe485a17cd8395a5f35e6b80b57665a – < 6655b56e2801008566c594ef231f6c7b3f716c61
- affected ec97ecf1ebe485a17cd8395a5f35e6b80b57665a – < 4864f58c53eb47257d55e01f47d4a9f355f7f970
- affected 5.6
- unaffected < 5.6
- unaffected 5.10.271 – ≤ 5.10.*
- unaffected 5.15.222 – ≤ 5.15.*
- unaffected 6.1.189 – ≤ 6.1.*
- unaffected 6.6.158 – ≤ 6.6.*
- unaffected 6.12.111 – ≤ 6.12.*
- unaffected 6.18.53 – ≤ 6.18.*
- unaffected 7.2.7 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References8
- https://git.kernel.org/stable/c/ff4f3a0f3abd2ded467931d7da7984a68a768e0b (opens in a new tab)
- https://git.kernel.org/stable/c/749aaebc1eb92ce2f38fd3caf68a2f99686d84ef (opens in a new tab)
- https://git.kernel.org/stable/c/8fd98e56c41f79278eeb67512c28d7abc175bcf4 (opens in a new tab)
- https://git.kernel.org/stable/c/215df1e953ae72a09d425ec188e054058ae23dc9 (opens in a new tab)
- https://git.kernel.org/stable/c/f90fe65b977e7aa9eb302230a09eb18f8c32ceaa (opens in a new tab)
- https://git.kernel.org/stable/c/c11e3a39807eb5a200445ae9082843ab86800415 (opens in a new tab)
- https://git.kernel.org/stable/c/6655b56e2801008566c594ef231f6c7b3f716c61 (opens in a new tab)
- https://git.kernel.org/stable/c/4864f58c53eb47257d55e01f47d4a9f355f7f970 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-86666 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-98013)Record last updated .