{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "ec97ecf1ebe485a17cd8395a5f35e6b80b57665a"
            },
            {
              "fixed": "1f43e4dbc93b7d02761a024d5f895df823c07b72"
            },
            {
              "fixed": "f7942b2693bc24c7d609a03d06f97bee3b0bd96a"
            },
            {
              "fixed": "6f1be05faecef4c0f9a008200209f66ef2e133f7"
            },
            {
              "fixed": "435da3734a8e63d3067016accc977ed1d10aaaa0"
            },
            {
              "fixed": "44dad8fe99b58a7fe2961e9eec6a5f07ace5b51f"
            },
            {
              "fixed": "044fa2498bbc2900f0c48a6ef2fdd5b2bdfc3795"
            },
            {
              "fixed": "bf97fd2163ad1191ef8daa3d4df8372aee19e396"
            },
            {
              "fixed": "c86cd7ed0b0e44779a3d1683f03e4353baf4bdc9"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.6.0"
            },
            {
              "fixed": "5.10.270"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.221"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.188"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.157"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.110"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.52"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90074.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: fq_pie: clamp default quantum to avoid signed overflow\n\nfq_pie_init() sets q-\u003equantum = psched_mtu(qdisc_dev(sch)) without\nclamping. A device with a huge MTU (e.g. dummy with max_mtu == 0\naccepting MTU 2147483634) makes psched_mtu() return 0x80000000, which\noverflows the signed flow-\u003edeficit to INT_MIN in fq_pie_qdisc_dequeue(),\ncausing an infinite loop and soft lockup. Emulate fq_pie_policy which\nis already bounded to [1, 1 \u003c\u003c 20]; clamp the default to [256, 1 \u003c\u003c 20].\n256 matches fq_codel's floor and is a sane minimum for a DRR quantum.\n\nConditions to recreate the bug: a device whose MTU (plus\nhard_header_len) wraps psched_mtu() into the sign bit (e.g. a dummy\ndevice with max_mtu == 0 accepting MTU 2147483634). Requires\nCAP_NET_ADMIN in a user namespace.",
  "id": "CVE-2026-90074",
  "modified": "2026-09-19T03:30:55.234717132Z",
  "published": "2026-09-17T16:05:54.214Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/044fa2498bbc2900f0c48a6ef2fdd5b2bdfc3795"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1f43e4dbc93b7d02761a024d5f895df823c07b72"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/435da3734a8e63d3067016accc977ed1d10aaaa0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/44dad8fe99b58a7fe2961e9eec6a5f07ace5b51f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6f1be05faecef4c0f9a008200209f66ef2e133f7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bf97fd2163ad1191ef8daa3d4df8372aee19e396"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c86cd7ed0b0e44779a3d1683f03e4353baf4bdc9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f7942b2693bc24c7d609a03d06f97bee3b0bd96a"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90074.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90074"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "net/sched: fq_pie: clamp default quantum to avoid signed overflow"
}