CVE-2026-98013net/sched: fq_pie: clamp quantum in change path
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 19, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from ec97ecf1ebe485a17cd8395a5f35e6b80b57665a before ff4f3a0f3abd2ded467931d7da7984a68a768e0b; from ec97ecf1ebe485a17cd8395a5f35e6b80b57665a before 749aaebc1eb92ce2f38fd3caf68a2f99686d84ef; from ec97ecf1ebe485a17cd8395a5f35e6b80b57665a before 8fd98e56c41f79278eeb67512c28d7abc175bcf4; from ec97ecf1ebe485a17cd8395a5f35e6b80b57665a before 215df1e953ae72a09d425ec188e054058ae23dc9; from ec97ecf1ebe485a17cd8395a5f35e6b80b57665a before f90fe65b977e7aa9eb302230a09eb18f8c32ceaa; from ec97ecf1ebe485a17cd8395a5f35e6b80b57665a before c11e3a39807eb5a200445ae9082843ab86800415; from ec97ecf1ebe485a17cd8395a5f35e6b80b57665a before 6655b56e2801008566c594ef231f6c7b3f716c61; from ec97ecf1ebe485a17cd8395a5f35e6b80b57665a before 4864f58c53eb47257d55e01f47d4a9f355f7f970 | CNA record |
References
- https://git.kernel.org/stable/c/ff4f3a0f3abd2ded467931d7da7984a68a768e0b
- https://git.kernel.org/stable/c/749aaebc1eb92ce2f38fd3caf68a2f99686d84ef
- https://git.kernel.org/stable/c/8fd98e56c41f79278eeb67512c28d7abc175bcf4
- https://git.kernel.org/stable/c/215df1e953ae72a09d425ec188e054058ae23dc9
- https://git.kernel.org/stable/c/f90fe65b977e7aa9eb302230a09eb18f8c32ceaa
- https://git.kernel.org/stable/c/c11e3a39807eb5a200445ae9082843ab86800415
- https://git.kernel.org/stable/c/6655b56e2801008566c594ef231f6c7b3f716c61
- https://git.kernel.org/stable/c/4864f58c53eb47257d55e01f47d4a9f355f7f970
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.