net/sched: fq_pie: clamp quantum in change path
Summary
| CVE | CVE-2026-98013 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-09-25 11:17:29 UTC |
| Updated | 2026-10-19 10:17:54 UTC |
| 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 |
Risk And Classification
EPSS: 0.001760000 probability, percentile 0.065270000 (date 2026-10-05)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected ec97ecf1ebe485a17cd8395a5f35e6b80b57665a ff4f3a0f3abd2ded467931d7da7984a68a768e0b git | Not specified |
| CNA | Linux | Linux | affected ec97ecf1ebe485a17cd8395a5f35e6b80b57665a 749aaebc1eb92ce2f38fd3caf68a2f99686d84ef git | Not specified |
| CNA | Linux | Linux | affected ec97ecf1ebe485a17cd8395a5f35e6b80b57665a 8fd98e56c41f79278eeb67512c28d7abc175bcf4 git | Not specified |
| CNA | Linux | Linux | affected ec97ecf1ebe485a17cd8395a5f35e6b80b57665a 215df1e953ae72a09d425ec188e054058ae23dc9 git | Not specified |
| 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 5.10.271 5.10.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.15.222 5.15.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.189 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.158 6.6.* 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 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| 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/749aaebc1eb92ce2f38fd3caf68a2f99686d84ef | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/ff4f3a0f3abd2ded467931d7da7984a68a768e0b | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/8fd98e56c41f79278eeb67512c28d7abc175bcf4 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/f90fe65b977e7aa9eb302230a09eb18f8c32ceaa | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/215df1e953ae72a09d425ec188e054058ae23dc9 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.