{"api_version":"1","generated_at":"2026-09-20T02:45:57+00:00","cve":"CVE-2026-90074","urls":{"html":"https://cve.report/CVE-2026-90074","api":"https://cve.report/api/cve/CVE-2026-90074.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-90074","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-90074"},"summary":{"title":"net/sched: fq_pie: clamp default quantum to avoid signed overflow","description":"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->quantum = 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->deficit 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 << 20]; clamp the default to [256, 1 << 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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-17 17:16:56","updated_at":"2026-09-17 17:16:56"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/bf97fd2163ad1191ef8daa3d4df8372aee19e396","name":"https://git.kernel.org/stable/c/bf97fd2163ad1191ef8daa3d4df8372aee19e396","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/6f1be05faecef4c0f9a008200209f66ef2e133f7","name":"https://git.kernel.org/stable/c/6f1be05faecef4c0f9a008200209f66ef2e133f7","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c86cd7ed0b0e44779a3d1683f03e4353baf4bdc9","name":"https://git.kernel.org/stable/c/c86cd7ed0b0e44779a3d1683f03e4353baf4bdc9","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/44dad8fe99b58a7fe2961e9eec6a5f07ace5b51f","name":"https://git.kernel.org/stable/c/44dad8fe99b58a7fe2961e9eec6a5f07ace5b51f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f7942b2693bc24c7d609a03d06f97bee3b0bd96a","name":"https://git.kernel.org/stable/c/f7942b2693bc24c7d609a03d06f97bee3b0bd96a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/435da3734a8e63d3067016accc977ed1d10aaaa0","name":"https://git.kernel.org/stable/c/435da3734a8e63d3067016accc977ed1d10aaaa0","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/044fa2498bbc2900f0c48a6ef2fdd5b2bdfc3795","name":"https://git.kernel.org/stable/c/044fa2498bbc2900f0c48a6ef2fdd5b2bdfc3795","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/1f43e4dbc93b7d02761a024d5f895df823c07b72","name":"https://git.kernel.org/stable/c/1f43e4dbc93b7d02761a024d5f895df823c07b72","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-90074","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90074","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ec97ecf1ebe485a17cd8395a5f35e6b80b57665a 1f43e4dbc93b7d02761a024d5f895df823c07b72 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ec97ecf1ebe485a17cd8395a5f35e6b80b57665a f7942b2693bc24c7d609a03d06f97bee3b0bd96a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ec97ecf1ebe485a17cd8395a5f35e6b80b57665a 6f1be05faecef4c0f9a008200209f66ef2e133f7 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ec97ecf1ebe485a17cd8395a5f35e6b80b57665a 435da3734a8e63d3067016accc977ed1d10aaaa0 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/sched/sch_fq_pie.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"1f43e4dbc93b7d02761a024d5f895df823c07b72","status":"affected","version":"ec97ecf1ebe485a17cd8395a5f35e6b80b57665a","versionType":"git"},{"lessThan":"f7942b2693bc24c7d609a03d06f97bee3b0bd96a","status":"affected","version":"ec97ecf1ebe485a17cd8395a5f35e6b80b57665a","versionType":"git"},{"lessThan":"6f1be05faecef4c0f9a008200209f66ef2e133f7","status":"affected","version":"ec97ecf1ebe485a17cd8395a5f35e6b80b57665a","versionType":"git"},{"lessThan":"435da3734a8e63d3067016accc977ed1d10aaaa0","status":"affected","version":"ec97ecf1ebe485a17cd8395a5f35e6b80b57665a","versionType":"git"},{"lessThan":"44dad8fe99b58a7fe2961e9eec6a5f07ace5b51f","status":"affected","version":"ec97ecf1ebe485a17cd8395a5f35e6b80b57665a","versionType":"git"},{"lessThan":"044fa2498bbc2900f0c48a6ef2fdd5b2bdfc3795","status":"affected","version":"ec97ecf1ebe485a17cd8395a5f35e6b80b57665a","versionType":"git"},{"lessThan":"bf97fd2163ad1191ef8daa3d4df8372aee19e396","status":"affected","version":"ec97ecf1ebe485a17cd8395a5f35e6b80b57665a","versionType":"git"},{"lessThan":"c86cd7ed0b0e44779a3d1683f03e4353baf4bdc9","status":"affected","version":"ec97ecf1ebe485a17cd8395a5f35e6b80b57665a","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/sched/sch_fq_pie.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.6"},{"lessThan":"5.6","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.270","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.221","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.188","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.157","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.110","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.52","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.6","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.270","versionStartIncluding":"5.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.221","versionStartIncluding":"5.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.188","versionStartIncluding":"5.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.157","versionStartIncluding":"5.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.110","versionStartIncluding":"5.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.52","versionStartIncluding":"5.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.6","versionStartIncluding":"5.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc1","versionStartIncluding":"5.6","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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->quantum = 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->deficit 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 << 20]; clamp the default to [256, 1 << 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."}],"providerMetadata":{"dateUpdated":"2026-09-17T16:05:54.214Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/1f43e4dbc93b7d02761a024d5f895df823c07b72"},{"url":"https://git.kernel.org/stable/c/f7942b2693bc24c7d609a03d06f97bee3b0bd96a"},{"url":"https://git.kernel.org/stable/c/6f1be05faecef4c0f9a008200209f66ef2e133f7"},{"url":"https://git.kernel.org/stable/c/435da3734a8e63d3067016accc977ed1d10aaaa0"},{"url":"https://git.kernel.org/stable/c/44dad8fe99b58a7fe2961e9eec6a5f07ace5b51f"},{"url":"https://git.kernel.org/stable/c/044fa2498bbc2900f0c48a6ef2fdd5b2bdfc3795"},{"url":"https://git.kernel.org/stable/c/bf97fd2163ad1191ef8daa3d4df8372aee19e396"},{"url":"https://git.kernel.org/stable/c/c86cd7ed0b0e44779a3d1683f03e4353baf4bdc9"}],"title":"net/sched: fq_pie: clamp default quantum to avoid signed overflow","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","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"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-17 17:16:56","lastModifiedDate":"2026-09-17 17:16:56","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"90074","Ordinal":"1","Title":"net/sched: fq_pie: clamp default quantum to avoid signed overflo","CVE":"CVE-2026-90074","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"90074","Ordinal":"1","NoteData":"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->quantum = 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->deficit 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 << 20]; clamp the default to [256, 1 << 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.","Type":"Description","Title":"net/sched: fq_pie: clamp default quantum to avoid signed overflo"}]}}}