Improper Validation of Specified Quantity in Input in Linux kernel - CVE-2026-98021
Published: September 28, 2026
Vulnerability identifier: #VU152455
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-98021
CWE-ID: CWE-1284
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause excessive memory allocation.
The vulnerability exists due to improper validation of a specified quantity in input in the IFLA_TXQLEN netlink attribute when processing netlink requests that specify a transmit queue length. A local user can submit a netlink request with an oversized tx_queue_len value to cause excessive memory allocation.
Exploitation requires network scheduling, veth, user namespace, and network namespace support.
Affected software
Linux kernel
How to mitigate CVE-2026-98021
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3