net/sched: sch_taprio: Replace direct dequeue call with peek and qdisc_dequeue_peeked
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · Low · High
- Fix status
- Partial Red Hat: 2 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-476.
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.10.266, 5.15.217, 6.1.184, 6.6.145, 6.12.97, 6.18.40, 7.1.5, 7.2
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
Not affected: 3 products
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
Timeline
- 2026-10-02 Threatist record created from CVE-2026-72035
- 2026-10-03 Alias added: GHSA-cjrv-4qm5-hp28
- 2026-10-16 CISA SSVC decision points changed
- 2026-10-16 Priority changed: LOW → MEDIUM
- 2026-10-20 Weakness changed · CISA ADP
References
Other 8
- https://git.kernel.org/stable/c/51f8af240aed903e988755af33d7491030b50ae9
- https://git.kernel.org/stable/c/17ab5f76f3899f67e5569722f334591f4b88b17b
- https://git.kernel.org/stable/c/f60d5c12e0551012cee5c272b0bcbcc78f7bb506
- https://git.kernel.org/stable/c/6ee5a7665a9080bcb05d703bf981a579436fd05e
- https://git.kernel.org/stable/c/18d580cb00c55805633bae45e90cf22ed6b8e424
- https://git.kernel.org/stable/c/e2b7ee61989f2d39df6c2cc06f9db1aea69bdb09
- https://git.kernel.org/stable/c/2dcebbd1ad2e180fe7b98bf346ced69a872e11e6
- https://git.kernel.org/stable/c/e056e1dfcddca877dd46d704e8ec9860cfc9ec44
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Sources
- CVE-2026-72035 · CVE Program
- CVE-2026-72035 · NVD
- FIRST EPSS
- GHSA-cjrv-4qm5-hp28 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-72035 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences