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net/sched: fq_pie: clamp quantum in change path

Type: advisorySource: Official CVE List1 source record

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

Announced Source revision 1
Original source ↗

CVE-2026-98013

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-98013

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "ec97ecf1ebe485a17cd8395a5f35e6b80b57665a",
        "lessThan": "ff4f3a0f3abd2ded467931d7da7984a68a768e0b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ec97ecf1ebe485a17cd8395a5f35e6b80b57665a",
        "lessThan": "749aaebc1eb92ce2f38fd3caf68a2f99686d84ef",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ec97ecf1ebe485a17cd8395a5f35e6b80b57665a",
        "lessThan": "8fd98e56c41f79278eeb67512c28d7abc175bcf4",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ec97ecf1ebe485a17cd8395a5f35e6b80b57665a",
        "lessThan": "215df1e953ae72a09d425ec188e054058ae23dc9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ec97ecf1ebe485a17cd8395a5f35e6b80b57665a",
        "lessThan": "f90fe65b977e7aa9eb302230a09eb18f8c32ceaa",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ec97ecf1ebe485a17cd8395a5f35e6b80b57665a",
        "lessThan": "c11e3a39807eb5a200445ae9082843ab86800415",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ec97ecf1ebe485a17cd8395a5f35e6b80b57665a",
        "lessThan": "6655b56e2801008566c594ef231f6c7b3f716c61",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ec97ecf1ebe485a17cd8395a5f35e6b80b57665a",
        "lessThan": "4864f58c53eb47257d55e01f47d4a9f355f7f970",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/sched/sch_fq_pie.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.6"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.6",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.271",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.222",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.189",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.158",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.111",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.53",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.7",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/sched/sch_fq_pie.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-98013

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#38140 · Revision 1
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Publisher date
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