CVE-2026-90058
kernel: net/sched: bound qdisc_pkt_len to prevent qdisc soft lockup
Severity
LowRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · September 17, 2026
Updated · October 13, 2026
Description
A flaw was found in the Linux kernel's networking scheduler (net/sched). A local unprivileged user with CAP_NET_ADMIN capabilities within a user namespace could provide a crafted size table to a deficit scheduler, such as DRR or ETS, with a small quantum. This manipulation can cause the scheduler to enter an unbounded loop, leading to a soft lockup and a Denial of Service (DoS) condition for the system.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-606 · Unchecked Input for Loop Condition