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GHSA-CJRV-4QM5-HP28

Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-23 15:32
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

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

When taprio's software path peeks a non-work-conserving child qdisc, the child stashes the peeked skb in its gso_skb; taprio_dequeue_from_txq() then takes the packet with a direct child ->dequeue() call, which ignores that stash, orphans the peeked skb and desyncs the child's qlen/backlog. With a qfq child 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_red and sch_sfb now do. The helper returns the child's stashed skb first and is a no-op when there is none, so a work-conserving child is unaffected and the gated path now consumes the skb whose length was charged to the budget.

Severity
8.2 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-72035"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:21:12Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: sch_taprio: Replace direct dequeue call with peek and qdisc_dequeue_peeked\n\nWhen taprio\u0027s software path peeks a non-work-conserving child qdisc, the\nchild stashes the peeked skb in its gso_skb; taprio_dequeue_from_txq()\nthen takes the packet with a direct child -\u003edequeue() call, which ignores\nthat stash, orphans the peeked skb and desyncs the child\u0027s qlen/backlog.\nWith a qfq child 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_red and sch_sfb\nnow do. The helper returns the child\u0027s stashed skb first and is a no-op\nwhen there is none, so a work-conserving child is unaffected and the\ngated path now consumes the skb whose length was charged to the budget.",
  "id": "GHSA-cjrv-4qm5-hp28",
  "modified": "2026-08-23T15:32:58Z",
  "published": "2026-08-15T06:32:09Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72035"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/17ab5f76f3899f67e5569722f334591f4b88b17b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/18d580cb00c55805633bae45e90cf22ed6b8e424"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2dcebbd1ad2e180fe7b98bf346ced69a872e11e6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/51f8af240aed903e988755af33d7491030b50ae9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6ee5a7665a9080bcb05d703bf981a579436fd05e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e056e1dfcddca877dd46d704e8ec9860cfc9ec44"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e2b7ee61989f2d39df6c2cc06f9db1aea69bdb09"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f60d5c12e0551012cee5c272b0bcbcc78f7bb506"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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