CVE-2026-72035
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.
How to fix
- Linux Linux51f8af240aed903e988755af33d7491030b50ae9, 17ab5f76f3899f67e5569722f334591f4b88b17b, f60d5c12e0551012cee5c272b0bcbcc78f7bb506, 6ee5a7665a9080bcb05d703bf981a579436fd05e, 18d580cb00c55805633bae45e90cf22ed6b8e424, e2b7ee61989f2d39df6c2cc06f9db1aea69bdb09, 2dcebbd1ad2e180fe7b98bf346ced69a872e11e6, e056e1dfcddca877dd46d704e8ec9860cfc9ec44 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 5a781ccbd19e4664babcbe4b4ead7aa2b9283d22 ≤ v < 51f8af240aed903e988755af33d7491030b50ae9, 5a781ccbd19e4664babcbe4b4ead7aa2b9283d22 ≤ v < 17ab5f76f3899f67e5569722f334591f4b88b17b, 5a781ccbd19e4664babcbe4b4ead7aa2b9283d22 ≤ v < f60d5c12e0551012cee5c272b0bcbcc78f7bb506, 5a781ccbd19e4664babcbe4b4ead7aa2b9283d22 ≤ v < 6ee5a7665a9080bcb05d703bf981a579436fd05e, 5a781ccbd19e4664babcbe4b4ead7aa2b9283d22 ≤ v < 18d580cb00c55805633bae45e90cf22ed6b8e424, 5a781ccbd19e4664babcbe4b4ead7aa2b9283d22 ≤ v < e2b7ee61989f2d39df6c2cc06f9db1aea69bdb09, 5a781ccbd19e4664babcbe4b4ead7aa2b9283d22 ≤ v < 2dcebbd1ad2e180fe7b98bf346ced69a872e11e6, 5a781ccbd19e4664babcbe4b4ead7aa2b9283d22 ≤ v < e056e1dfcddca877dd46d704e8ec9860cfc9ec44, 4.20 | 51f8af240aed903e988755af33d7491030b50ae9, 17ab5f76f3899f67e5569722f334591f4b88b17b, f60d5c12e0551012cee5c272b0bcbcc78f7bb506, 6ee5a7665a9080bcb05d703bf981a579436fd05e, 18d580cb00c55805633bae45e90cf22ed6b8e424, e2b7ee61989f2d39df6c2cc06f9db1aea69bdb09, 2dcebbd1ad2e180fe7b98bf346ced69a872e11e6, e056e1dfcddca877dd46d704e8ec9860cfc9ec44 |
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