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net/sched: sch_multiq: Replace direct dequeue call with peek and qdisc_dequeue_peeked

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-72036

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-72036

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "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"
  }
]
Related CVEs
CVE-2026-72036

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#41843 · Revision 1
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Publisher date
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