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CVE-2026-72035 (GCVE-0-2026-72035)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:51 – Updated: 2026-08-23 12:46
VLAI
Title
net/sched: sch_taprio: Replace direct dequeue call with peek and qdisc_dequeue_peeked
Summary
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
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 5a781ccbd19e4664babcbe4b4ead7aa2b9283d22 , < 51f8af240aed903e988755af33d7491030b50ae9 (git)
Affected: 5a781ccbd19e4664babcbe4b4ead7aa2b9283d22 , < 17ab5f76f3899f67e5569722f334591f4b88b17b (git)
Affected: 5a781ccbd19e4664babcbe4b4ead7aa2b9283d22 , < f60d5c12e0551012cee5c272b0bcbcc78f7bb506 (git)
Affected: 5a781ccbd19e4664babcbe4b4ead7aa2b9283d22 , < 6ee5a7665a9080bcb05d703bf981a579436fd05e (git)
Affected: 5a781ccbd19e4664babcbe4b4ead7aa2b9283d22 , < 18d580cb00c55805633bae45e90cf22ed6b8e424 (git)
Affected: 5a781ccbd19e4664babcbe4b4ead7aa2b9283d22 , < e2b7ee61989f2d39df6c2cc06f9db1aea69bdb09 (git)
Affected: 5a781ccbd19e4664babcbe4b4ead7aa2b9283d22 , < 2dcebbd1ad2e180fe7b98bf346ced69a872e11e6 (git)
Affected: 5a781ccbd19e4664babcbe4b4ead7aa2b9283d22 , < e056e1dfcddca877dd46d704e8ec9860cfc9ec44 (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.20
Unaffected: 0 , < 4.20 (semver)
Unaffected: 5.10.266 , ≤ 5.10.* (semver)
Unaffected: 5.15.217 , ≤ 5.15.* (semver)
Unaffected: 6.1.184 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
        {
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The fault is in taprio\u0027s software egress dequeue path (`__dev_queue_xmit` \u2192 `__qdisc_run` \u2192 `taprio_dequeue` \u2192 `taprio_dequeue_from_txq`) during ordinary packet transmission in softirq; on TSN/automotive/industrial gateways where taprio+qfq is already deployed, any remote peer can trigger it by sending traffic that causes egress through the gated queues.\nAC:L - Once taprio is configured with a non-work-conserving child such as qfq on the software path (no full offload, TXTIME_ASSIST disabled), peek followed by the incorrect direct `dequeue()` deterministically orphans the stashed skb, desyncs qlen/backlog, and re-enters qfq on an emptied list; the attacker fully controls triggering traffic with no uncontrollable races.\nPR:N - Installing taprio and grafting a qfq child requires CAP_NET_ADMIN via RTM_NEWQDISC, but on reasonably deployed TSN/industrial systems where operators have already configured this stack, triggering the bug requires only the ability to send packets through the affected interface\u2014no credentials or capabilities on the victim host.\nUI:N - Exploitation needs only attacker-generated network traffic (or any local sender) once the qdisc hierarchy exists; no victim login, mount, file open, or other interactive action is required at trigger time.\nS:U - The NULL dereference kernel panic and qdisc qlen/backlog corruption occur entirely within the host kernel\u0027s security authority; this is not a VM escape, container breakout, or IOMMU/DMA boundary bypass.\nC:N - The published failure mode is a NULL pointer dereference in qfq after taprio mishandles the peek stash; although the peeked skb is orphaned and child counters desync, there is no use-after-free, out-of-bounds read, or demonstrated arbitrary kernel memory disclosure primitive.\nI:L - Calling `child-\u003eops-\u003edequeue()` instead of `qdisc_dequeue_peeked()` orphans the peek-stashed skb and corrupts the child qdisc\u0027s qlen/backlog accounting before the fatal qfq re-entry, enabling attacker-driven mis-accounting of queued traffic on the affected egress path prior to panic.\nA:H - With a qfq child the desynchronized dequeue path dereferences NULL from softirq during ordinary egress, panicking the kernel; the condition is repeatable whenever gated transmission exercises the peek/dequeue mismatch, causing total host availability loss."
            }
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
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      ],
      "title": "net/sched: sch_taprio: Replace direct dequeue call with peek and qdisc_dequeue_peeked",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72035",
    "datePublished": "2026-08-15T05:51:56.374Z",
    "dateReserved": "2026-08-09T03:40:39.901Z",
    "dateUpdated": "2026-08-23T12:46:29.870Z",
    "state": "PUBLISHED"
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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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/sched/sch_taprio.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5a781ccbd19e4664babcbe4b4ead7aa2b9283d22\",\"lessThan\":\"51f8af240aed903e988755af33d7491030b50ae9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5a781ccbd19e4664babcbe4b4ead7aa2b9283d22\",\"lessThan\":\"17ab5f76f3899f67e5569722f334591f4b88b17b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5a781ccbd19e4664babcbe4b4ead7aa2b9283d22\",\"lessThan\":\"f60d5c12e0551012cee5c272b0bcbcc78f7bb506\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5a781ccbd19e4664babcbe4b4ead7aa2b9283d22\",\"lessThan\":\"6ee5a7665a9080bcb05d703bf981a579436fd05e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5a781ccbd19e4664babcbe4b4ead7aa2b9283d22\",\"lessThan\":\"18d580cb00c55805633bae45e90cf22ed6b8e424\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5a781ccbd19e4664babcbe4b4ead7aa2b9283d22\",\"lessThan\":\"e2b7ee61989f2d39df6c2cc06f9db1aea69bdb09\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5a781ccbd19e4664babcbe4b4ead7aa2b9283d22\",\"lessThan\":\"2dcebbd1ad2e180fe7b98bf346ced69a872e11e6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5a781ccbd19e4664babcbe4b4ead7aa2b9283d22\",\"lessThan\":\"e056e1dfcddca877dd46d704e8ec9860cfc9ec44\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/sched/sch_taprio.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.20\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.20\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.266\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.217\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.184\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.97\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.40\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H\",\"baseScore\":8.2,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"LOW\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":4.2}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/17ab5f76f3899f67e5569722f334591f4b88b17b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/18d580cb00c55805633bae45e90cf22ed6b8e424\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2dcebbd1ad2e180fe7b98bf346ced69a872e11e6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/51f8af240aed903e988755af33d7491030b50ae9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6ee5a7665a9080bcb05d703bf981a579436fd05e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e056e1dfcddca877dd46d704e8ec9860cfc9ec44\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e2b7ee61989f2d39df6c2cc06f9db1aea69bdb09\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f60d5c12e0551012cee5c272b0bcbcc78f7bb506\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-23T14:23:28+00:00",
      "cve": "CVE-2026-72035",
      "id": "CVE-2026-72035",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net/sched: sch_taprio: Replace direct dequeue call with peek and qdisc_dequeue_peeked",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72035.json",
      "version": "3"
    }
  }
}



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