CVE-2026-90074 (GCVE-0-2026-90074)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:05 – Updated: 2026-09-17 16:05
VLAI
Title
net/sched: fq_pie: clamp default quantum to avoid signed overflow
Summary
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->quantum = 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->deficit 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 << 20]; clamp the default to [256, 1 << 20]. 256 matches fq_codel's 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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: ec97ecf1ebe485a17cd8395a5f35e6b80b57665a , < 1f43e4dbc93b7d02761a024d5f895df823c07b72 (git)
Affected: ec97ecf1ebe485a17cd8395a5f35e6b80b57665a , < f7942b2693bc24c7d609a03d06f97bee3b0bd96a (git)
Affected: ec97ecf1ebe485a17cd8395a5f35e6b80b57665a , < 6f1be05faecef4c0f9a008200209f66ef2e133f7 (git)
Affected: ec97ecf1ebe485a17cd8395a5f35e6b80b57665a , < 435da3734a8e63d3067016accc977ed1d10aaaa0 (git)
Affected: ec97ecf1ebe485a17cd8395a5f35e6b80b57665a , < 44dad8fe99b58a7fe2961e9eec6a5f07ace5b51f (git)
Affected: ec97ecf1ebe485a17cd8395a5f35e6b80b57665a , < 044fa2498bbc2900f0c48a6ef2fdd5b2bdfc3795 (git)
Affected: ec97ecf1ebe485a17cd8395a5f35e6b80b57665a , < bf97fd2163ad1191ef8daa3d4df8372aee19e396 (git)
Affected: ec97ecf1ebe485a17cd8395a5f35e6b80b57665a , < c86cd7ed0b0e44779a3d1683f03e4353baf4bdc9 (git)
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Linux Linux Affected: 5.6
Unaffected: 0 , < 5.6 (semver)
Unaffected: 5.10.270 , ≤ 5.10.* (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.52 , ≤ 6.18.* (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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{
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          "programFiles": [
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              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
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        }
      ],
      "cpeApplicability": [
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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\u0027s 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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-17T16:05:54.214Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/1f43e4dbc93b7d02761a024d5f895df823c07b72"
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          "url": "https://git.kernel.org/stable/c/f7942b2693bc24c7d609a03d06f97bee3b0bd96a"
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        }
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      "title": "net/sched: fq_pie: clamp default quantum to avoid signed overflow",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90074",
    "datePublished": "2026-09-17T16:05:54.214Z",
    "dateReserved": "2026-09-11T19:38:34.785Z",
    "dateUpdated": "2026-09-17T16:05:54.214Z",
    "state": "PUBLISHED"
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  "dataVersion": "5.2",
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      "date": "2026-09-25",
      "epss": "0.0021",
      "percentile": "0.10068"
    },
    "microsoft_vex": {
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      "cve": "CVE-2026-90074",
      "id": "msrc_CVE-2026-90074",
      "initial_release_date": "2026-09-19T01:03:56.000Z",
      "product_status:fixed": "1",
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      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "net/sched: fq_pie: clamp default quantum to avoid signed overflow",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-90074.json",
      "version": "4"
    },
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        "cveTags": [],
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          {
            "lang": "en",
            "value": "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\u0027s 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",
        "lastModified": "2026-09-17T17:16:56.530",
        "metrics": {},
        "published": "2026-09-17T17:16:56.530",
        "references": [
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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            "url": "https://git.kernel.org/stable/c/44dad8fe99b58a7fe2961e9eec6a5f07ace5b51f"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/6f1be05faecef4c0f9a008200209f66ef2e133f7"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/bf97fd2163ad1191ef8daa3d4df8372aee19e396"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/c86cd7ed0b0e44779a3d1683f03e4353baf4bdc9"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/f7942b2693bc24c7d609a03d06f97bee3b0bd96a"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    }
  }
}



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