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net/sched: ets: clamp quantum in parse and fallback paths

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: net/sched: ets: clamp quantum in parse and fallback paths ets_qdisc_change() falls back to psched_mtu() with no floor for bands without an explicit quantum. With a crafted size table qdisc_pkt_len reaches ~2 GiB, so a zero psched_mtu on a headerless device makes the deficit-refill loop spin under the qdisc lock. Move the floor into ets_quantum_parse() so explicitly configured quanta are also clamped to [256, 1<<20], not just the fallback path. Conditions to recreate the bug: CONFIG_NET_SCH_ETS=y. Requires CAP_NET_ADMIN (namespace-local via unshare -Urn suffices). tc qdisc add dev dummy0 root ets bands 3 strict 2 quanta 1 1

Announced Source revision 1
Original source ↗

CVE-2026-98009

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-2026-98009

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": "dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33",
        "lessThan": "440b66cc7b56ea38e9b878ae88da91992efaa4c4",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33",
        "lessThan": "4ef8664eafafc8db68a1d52601f17dc008a223b7",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33",
        "lessThan": "8b8d782c3b96376217087767dcf662cd3d25f226",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33",
        "lessThan": "226d2702e74a570f5bfae6115b4706da4b94e5cf",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33",
        "lessThan": "99ae477b892e203a37985ebc56f0063e072f7f4b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33",
        "lessThan": "8f80b113dea0bed3c1a31a4224b72775cd9ec52d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33",
        "lessThan": "de22c30ec5598aca8797f02082d2ee1358dfa3ff",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33",
        "lessThan": "1c38487f46b243bfeefec0c0c86023a3904f2214",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/sched/sch_ets.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_ets.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-98009

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#38136 · Revision 1
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Publisher date
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