{
  "cveId": "CVE-2026-90074",
  "url": "https://patchblox.com/security/cve/CVE-2026-90074",
  "summary": "CVE-2026-90074 is fixed in 17 products on 1 platform, first by DEBIAN-CVE-2026-90074, released September 23, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "net/sched: fq_pie: clamp default quantum to avoid signed overflow",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  net/sched: fq_pie: clamp default quantum to avoid signed overflow  fq_pie_init() sets q-\u003Equantum = psched_mtu(qdisc_dev(sch)) without clamping. A device with a huge MTU (e.g. dummy with max_mtu == 0 accepting MTU 2147483634) makes psched_mtu() return 0x80000000, which overflows the signed flow-\u003Edeficit to INT_MIN in fq_pie_qdisc_dequeue(), causing an infinite loop and soft lockup. Emulate fq_pie_policy which is already bounded to [1, 1 \u003C\u003C 20]; clamp the default to [256, 1 \u003C\u003C 20]. 256 matches fq_codel\u0027s floor and is a sane minimum for a DRR quantum.  Conditions to recreate the bug: a device whose MTU (plus hard_header_len) wraps psched_mtu() into the sign bit (e.g. a dummy device with max_mtu == 0 accepting MTU 2147483634). Requires CAP_NET_ADMIN in a user namespace.",
  "published": "2026-09-17T17:16:56Z",
  "severity": "Moderate",
  "cvss": 5.5,
  "epss": 0.00216,
  "epssPercentile": 0.12146,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-90074",
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  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
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    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
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}