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net/sched: drr: clamp quantum in change class

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: net/sched: drr: clamp quantum in change class drr_change_class() rejects explicit quantum==0 but falls back to psched_mtu() with no floor. With a crafted size table qdisc_pkt_len reaches ~2 GiB, so quantum=1 (or a zero psched_mtu on a headerless device) makes the deficit-refill loop spin under the qdisc lock. Add clamp_t(u32, quantum, 256, 1<<20) after the zero reject and on the fallback path. The explicit-zero reject is preserved. Conditions to recreate the bug: CONFIG_NET_SCH_DRR=y. Requires CAP_NET_ADMIN (namespace-local via unshare -Urn suffices). tc qdisc add dev dummy0 root drr tc class add dev dummy0 parent 1: classid 1:1 drr quantum 1

Announced Source revision 1
Original source ↗

CVE-2026-98010

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-2026-98010

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": "13d2a1d2b032de08d7dcab6a1edcd47802681f96",
        "lessThan": "e2297bbf9cf6ece86f1d1f8c683517a994990f9e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "13d2a1d2b032de08d7dcab6a1edcd47802681f96",
        "lessThan": "560794ee6e040b6e1c4ac2b3c8909f341a4596ee",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "13d2a1d2b032de08d7dcab6a1edcd47802681f96",
        "lessThan": "23fea7e6736b2e1c6f6f2f05cccf33d36834da73",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "13d2a1d2b032de08d7dcab6a1edcd47802681f96",
        "lessThan": "b464affe9f9dfe41ac48930c376e3fb8596651b0",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "13d2a1d2b032de08d7dcab6a1edcd47802681f96",
        "lessThan": "dc8b374214ef5bba4882bbd95b361e42555cfc0d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "13d2a1d2b032de08d7dcab6a1edcd47802681f96",
        "lessThan": "d43cded350fe1218493ad3d37a276aff14108ae6",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "13d2a1d2b032de08d7dcab6a1edcd47802681f96",
        "lessThan": "8f756ae1c87414ce9cc21b30e6e4c036d6e9e80b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "13d2a1d2b032de08d7dcab6a1edcd47802681f96",
        "lessThan": "8382abec0f1568d0a5590d75a3df92f23fcf5196",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/sched/sch_drr.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.29"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.29",
        "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_drr.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-98010

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#38137 · Revision 1
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Publisher date
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