CVE-2026-72036 (GCVE-0-2026-72036)
Vulnerability from cvelistv5
Published
2026-08-15 05:51
Modified
2026-10-19 21:19
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_multiq: Replace direct dequeue call with peek and qdisc_dequeue_peeked multiq_dequeue() takes a packet from a band's child with a direct ->dequeue() call after multiq_peek() peeked it. When the child is non-work-conserving the peek stashes the skb in the child's gso_skb, so the direct dequeue returns a different skb and orphans the stash, desyncing the child's qlen/backlog. With a qfq child reached through a peeking parent (e.g. tbf) this re-enters the child on an emptied list and dereferences NULL, panicking the kernel from softirq on ordinary egress. Take the packet through qdisc_dequeue_peeked(), as sch_prio already does and as sch_red and sch_sfb were just fixed to do. The helper is a no-op when the child has no stash, so a work-conserving child is unaffected.
References
Impacted products
Vendor Product Version
Linux Linux Version: 77be155cba4e163e8bba9fd27222a8b6189ec4f7
Version: 77be155cba4e163e8bba9fd27222a8b6189ec4f7
Version: 77be155cba4e163e8bba9fd27222a8b6189ec4f7
Version: 77be155cba4e163e8bba9fd27222a8b6189ec4f7
Version: 77be155cba4e163e8bba9fd27222a8b6189ec4f7
Version: 77be155cba4e163e8bba9fd27222a8b6189ec4f7
Version: 77be155cba4e163e8bba9fd27222a8b6189ec4f7
Version: 77be155cba4e163e8bba9fd27222a8b6189ec4f7
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no VM, IOMMU, or sandbox security boundary is crossed.\\nC:H - Peek stashes the skb in the non-work-conserving child\u0027s gso_skb while direct dequeue returns a different packet, desyncing qlen/backlog\\u2014the 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.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"77be155cba4e163e8bba9fd27222a8b6189ec4f7\", \"lessThan\": \"3e5fd9d14f2d228e7260251f2e4a1d41ba8f705a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"77be155cba4e163e8bba9fd27222a8b6189ec4f7\", \"lessThan\": \"eb1a9637f0bd84b5db8803af65dfb1f44785406f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"77be155cba4e163e8bba9fd27222a8b6189ec4f7\", \"lessThan\": \"7a5a1582710981ef6637de9f074a60a5b1d63222\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"77be155cba4e163e8bba9fd27222a8b6189ec4f7\", \"lessThan\": \"86a61e46a1919e8abf4d227c204773dabb24068a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"77be155cba4e163e8bba9fd27222a8b6189ec4f7\", \"lessThan\": \"1b9cc255e8089606b92b2adf504e334573682821\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"77be155cba4e163e8bba9fd27222a8b6189ec4f7\", \"lessThan\": \"5889064919a1e5c0a9469c54895000414fc46944\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"77be155cba4e163e8bba9fd27222a8b6189ec4f7\", \"lessThan\": \"fffeb2ab5eeb823d4c2330571a098f63237c9049\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"77be155cba4e163e8bba9fd27222a8b6189ec4f7\", \"lessThan\": \"54f6b0c843e228d499eb4b6bbb89df68cad9ad5d\", \"versionType\": \"git\"}], \"programFiles\": [\"net/sched/sch_multiq.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"2.6.29\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"2.6.29\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.261\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.212\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.178\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.145\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.97\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.40\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"7.1.5\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.1.*\"}, {\"status\": \"unaffected\", \"version\": \"7.2\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/sched/sch_multiq.c\"], \"defaultStatus\": \"affected\"}], \"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\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"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\u0027s child with a direct\\n-\u003edequeue() call after multiq_peek() peeked it. When the child is\\nnon-work-conserving the peek stashes the skb in the child\u0027s gso_skb, so\\nthe direct dequeue returns a different skb and orphans the stash,\\ndesyncing the child\u0027s 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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.261\", \"versionStartIncluding\": \"2.6.29\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.212\", \"versionStartIncluding\": \"2.6.29\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.178\", \"versionStartIncluding\": \"2.6.29\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.145\", \"versionStartIncluding\": \"2.6.29\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.97\", \"versionStartIncluding\": \"2.6.29\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.40\", \"versionStartIncluding\": \"2.6.29\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.5\", \"versionStartIncluding\": \"2.6.29\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"2.6.29\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-17T05:39:39.361Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-72036\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T21:19:24.167Z\", \"dateReserved\": \"2026-08-09T03:40:39.901Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-08-15T05:51:57.012Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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