GHSA-CJRV-4QM5-HP28
Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-23 15:32In 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.
{
"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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