CVE-2026-98010

Status: UPDATED  |  Advisory ID: CVE-2026-98010

Key Details

Affected Products, Subsystems & Sectors

What to Know

In the Linux kernel, the following vulnerability has been resolved:

net/sched: drr: clamp quantum in change class

drr_change_class() rejects explicit quantum==0 but falls back to

psched_mtu() with no floor. With a crafted size table qdisc_pkt_len

reaches ~2 GiB, so quantum=1 (or a zero psched_mtu on a headerless

device) makes the deficit-refill loop spin under the qdisc lock.

Add clamp_t(u32, quantum, 256, 1<<20) after the zero reject and on the

fallback path. The explicit-zero reject is preserved.

Conditions to recreate the bug:

CONFIG_NET_SCH_DRR=y. Requires CAP_NET_ADMIN (namespace-local via

unshare -Urn suffices).

tc qdisc add dev dummy0 root drr

tc class add dev dummy0 parent 1: classid 1:1 drr quantum 1 (NVD)

What to Do

Monitor Linux's web page for any future patch releases.

References