Improper Validation of Specified Quantity in Input in Linux kernel - CVE-2026-98011
Published: September 28, 2026
Vulnerability identifier: #VU152462
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-98011
CWE-ID: CWE-1284
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper validation of the quantum value in the HHF queueing discipline when configuring an HHF qdisc with quantum set to 1 and a crafted size table. A local user can configure the qdisc with these values to cause a deficit-refill loop to spin under the qdisc lock and cause a denial of service.
Exploitation requires CONFIG_NET_SCH_HHF=y and CAP_NET_ADMIN in a network namespace.
Affected software
Linux kernel
How to mitigate CVE-2026-98011
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3