{"api_version":"1","generated_at":"2026-08-24T12:57:21+00:00","cve":"CVE-2026-72036","urls":{"html":"https://cve.report/CVE-2026-72036","api":"https://cve.report/api/cve/CVE-2026-72036.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-72036","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-72036"},"summary":{"title":"net/sched: sch_multiq: Replace direct dequeue call with peek and qdisc_dequeue_peeked","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: sch_multiq: Replace direct dequeue call with peek and qdisc_dequeue_peeked\n\nmultiq_dequeue() takes a packet from a band's child with a direct\n->dequeue() call after multiq_peek() peeked it. When the child is\nnon-work-conserving the peek stashes the skb in the child's gso_skb, so\nthe direct dequeue returns a different skb and orphans the stash,\ndesyncing the child's qlen/backlog. With a qfq child reached through a\npeeking parent (e.g. tbf) this re-enters the child on an emptied list and\ndereferences NULL, panicking the kernel from softirq on ordinary egress.\n\nTake the packet through qdisc_dequeue_peeked(), as sch_prio already does\nand as sch_red and sch_sfb were just fixed to do. The helper is a no-op\nwhen the child has no stash, so a work-conserving child is unaffected.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-15 06:21:12","updated_at":"2026-08-17 06:18:01"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/1b9cc255e8089606b92b2adf504e334573682821","name":"https://git.kernel.org/stable/c/1b9cc255e8089606b92b2adf504e334573682821","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3e5fd9d14f2d228e7260251f2e4a1d41ba8f705a","name":"https://git.kernel.org/stable/c/3e5fd9d14f2d228e7260251f2e4a1d41ba8f705a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5889064919a1e5c0a9469c54895000414fc46944","name":"https://git.kernel.org/stable/c/5889064919a1e5c0a9469c54895000414fc46944","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/eb1a9637f0bd84b5db8803af65dfb1f44785406f","name":"https://git.kernel.org/stable/c/eb1a9637f0bd84b5db8803af65dfb1f44785406f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/fffeb2ab5eeb823d4c2330571a098f63237c9049","name":"https://git.kernel.org/stable/c/fffeb2ab5eeb823d4c2330571a098f63237c9049","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7a5a1582710981ef6637de9f074a60a5b1d63222","name":"https://git.kernel.org/stable/c/7a5a1582710981ef6637de9f074a60a5b1d63222","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/54f6b0c843e228d499eb4b6bbb89df68cad9ad5d","name":"https://git.kernel.org/stable/c/54f6b0c843e228d499eb4b6bbb89df68cad9ad5d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/86a61e46a1919e8abf4d227c204773dabb24068a","name":"https://git.kernel.org/stable/c/86a61e46a1919e8abf4d227c204773dabb24068a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-72036","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72036","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 77be155cba4e163e8bba9fd27222a8b6189ec4f7 3e5fd9d14f2d228e7260251f2e4a1d41ba8f705a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 77be155cba4e163e8bba9fd27222a8b6189ec4f7 eb1a9637f0bd84b5db8803af65dfb1f44785406f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 77be155cba4e163e8bba9fd27222a8b6189ec4f7 7a5a1582710981ef6637de9f074a60a5b1d63222 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 77be155cba4e163e8bba9fd27222a8b6189ec4f7 86a61e46a1919e8abf4d227c204773dabb24068a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.212 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.178 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.145 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.97 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.40 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.5 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"72036","cve":"CVE-2026-72036","epss":"0.001640000","percentile":"0.060790000","score_date":"2026-08-17","updated_at":"2026-08-18 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the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: sch_multiq: Replace direct dequeue call with peek and qdisc_dequeue_peeked\n\nmultiq_dequeue() takes a packet from a band's child with a direct\n->dequeue() call after multiq_peek() peeked it. When the child is\nnon-work-conserving the peek stashes the skb in the child's gso_skb, so\nthe direct dequeue returns a different skb and orphans the stash,\ndesyncing the child's qlen/backlog. With a qfq child reached through a\npeeking parent (e.g. tbf) this re-enters the child on an emptied list and\ndereferences NULL, panicking the kernel from softirq on ordinary egress.\n\nTake the packet through qdisc_dequeue_peeked(), as sch_prio already does\nand as sch_red and sch_sfb were just fixed to do. The helper is a no-op\nwhen the child has no stash, so a work-conserving child is unaffected."}],"metrics":[{"cvssV3_1":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"scenarios":[{"lang":"en","value":"AV:L - Exploitation requires locally installing a tbf→multiq→qfq hierarchy on a multiqueue netdev via RTM_NEWQDISC/tc netlink before egress can hit multiq_dequeue(); per kernel CNA guidance, tc/qdisc configuration bugs are Local even though the panic fires from softirq during packet transmission.\nAC:L - Once the hierarchy exists, the peek/dequeue mismatch is a deterministic logic bug: tbf peek stashes the QFQ child's skb in gso_skb, then multiq_dequeue's direct child->dequeue() bypasses that stash and re-enters QFQ on an emptied list; ping reproducers for sch_red/sfb show no race or layout dependency.\nPR:L - RTM_NEWQDISC and qdisc grafting are gated by netlink_net_capable(skb, CAP_NET_ADMIN) in rtnetlink_rcv_msg, evaluated against net->user_ns; unprivileged users obtain CAP_NET_ADMIN via user/network namespaces (unshare -Urn) without init-namespace root.\nUI:N - No victim interaction is needed after qdisc setup; triggering the NULL dereference requires only attacker-generated egress traffic (e.g., ping) through the defective tbf→multiq→qfq dequeue path.\nS:U - The qlen/backlog desync, orphaned gso_skb stash, and resulting kernel panic occur entirely within the host kernel packet scheduler; no VM, IOMMU, or sandbox security boundary is crossed.\nC:H - Peek stashes the skb in the non-work-conserving child's gso_skb while direct dequeue returns a different packet, desyncing qlen/backlog—the same scheduler-accounting corruption primitive seen in prior net/sched CVEs and capable of exposing corrupted or freed kernel scheduler memory.\nI:H - Orphaning the gso_skb stash corrupts parent/child queue linkage and QFQ aggregate scheduling state; inconsistent qlen drives invalid list operations in qfq_dequeue, yielding attacker-influenced memory corruption beyond the demonstrated NULL dereference.\nA:H - The desync re-enters QFQ on an emptied aggregate list and dereferences NULL in qfq_dequeue from softirq during ordinary egress, panicking the kernel as documented in the fix commit and matching KASAN null-ptr-deref traces in the related sch_red/sch_sfb reports."}]}],"providerMetadata":{"dateUpdated":"2026-08-17T05:39:39.361Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/3e5fd9d14f2d228e7260251f2e4a1d41ba8f705a"},{"url":"https://git.kernel.org/stable/c/eb1a9637f0bd84b5db8803af65dfb1f44785406f"},{"url":"https://git.kernel.org/stable/c/7a5a1582710981ef6637de9f074a60a5b1d63222"},{"url":"https://git.kernel.org/stable/c/86a61e46a1919e8abf4d227c204773dabb24068a"},{"url":"https://git.kernel.org/stable/c/1b9cc255e8089606b92b2adf504e334573682821"},{"url":"https://git.kernel.org/stable/c/5889064919a1e5c0a9469c54895000414fc46944"},{"url":"https://git.kernel.org/stable/c/fffeb2ab5eeb823d4c2330571a098f63237c9049"},{"url":"https://git.kernel.org/stable/c/54f6b0c843e228d499eb4b6bbb89df68cad9ad5d"}],"title":"net/sched: sch_multiq: Replace direct dequeue call with peek and qdisc_dequeue_peeked","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-72036","datePublished":"2026-08-15T05:51:57.012Z","dateReserved":"2026-08-09T03:40:39.901Z","dateUpdated":"2026-08-17T05:39:39.361Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-15 06:21:12","lastModifiedDate":"2026-08-17 06:18:01","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"72036","Ordinal":"1","Title":"net/sched: sch_multiq: Replace direct dequeue call with peek and","CVE":"CVE-2026-72036","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"72036","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: sch_multiq: Replace direct dequeue call with peek and qdisc_dequeue_peeked\n\nmultiq_dequeue() takes a packet from a band's child with a direct\n->dequeue() call after multiq_peek() peeked it. When the child is\nnon-work-conserving the peek stashes the skb in the child's gso_skb, so\nthe direct dequeue returns a different skb and orphans the stash,\ndesyncing the child's qlen/backlog. With a qfq child reached through a\npeeking parent (e.g. tbf) this re-enters the child on an emptied list and\ndereferences NULL, panicking the kernel from softirq on ordinary egress.\n\nTake the packet through qdisc_dequeue_peeked(), as sch_prio already does\nand as sch_red and sch_sfb were just fixed to do. The helper is a no-op\nwhen the child has no stash, so a work-conserving child is unaffected.","Type":"Description","Title":"net/sched: sch_multiq: Replace direct dequeue call with peek and"}]}}}