{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-90074","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-09-11T19:38:34.785Z","datePublished":"2026-09-17T16:05:54.214Z","dateUpdated":"2026-09-17T16:05:54.214Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-09-17T16:05:54.214Z"},"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."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sched/sch_fq_pie.c"],"versions":[{"version":"ec97ecf1ebe485a17cd8395a5f35e6b80b57665a","lessThan":"1f43e4dbc93b7d02761a024d5f895df823c07b72","status":"affected","versionType":"git"},{"version":"ec97ecf1ebe485a17cd8395a5f35e6b80b57665a","lessThan":"f7942b2693bc24c7d609a03d06f97bee3b0bd96a","status":"affected","versionType":"git"},{"version":"ec97ecf1ebe485a17cd8395a5f35e6b80b57665a","lessThan":"6f1be05faecef4c0f9a008200209f66ef2e133f7","status":"affected","versionType":"git"},{"version":"ec97ecf1ebe485a17cd8395a5f35e6b80b57665a","lessThan":"435da3734a8e63d3067016accc977ed1d10aaaa0","status":"affected","versionType":"git"},{"version":"ec97ecf1ebe485a17cd8395a5f35e6b80b57665a","lessThan":"44dad8fe99b58a7fe2961e9eec6a5f07ace5b51f","status":"affected","versionType":"git"},{"version":"ec97ecf1ebe485a17cd8395a5f35e6b80b57665a","lessThan":"044fa2498bbc2900f0c48a6ef2fdd5b2bdfc3795","status":"affected","versionType":"git"},{"version":"ec97ecf1ebe485a17cd8395a5f35e6b80b57665a","lessThan":"bf97fd2163ad1191ef8daa3d4df8372aee19e396","status":"affected","versionType":"git"},{"version":"ec97ecf1ebe485a17cd8395a5f35e6b80b57665a","lessThan":"c86cd7ed0b0e44779a3d1683f03e4353baf4bdc9","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sched/sch_fq_pie.c"],"versions":[{"version":"5.6","status":"affected"},{"version":"0","lessThan":"5.6","status":"unaffected","versionType":"semver"},{"version":"5.10.270","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.221","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.188","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.157","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.110","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.52","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.6","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3-rc1","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"5.10.270"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"5.15.221"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"6.1.188"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"6.6.157"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"6.12.110"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"6.18.52"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"7.2.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"7.3-rc1"}]}]}],"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"}}}}