Integer overflow in Linux kernel - CVE-2026-90076
Published: September 19, 2026
Vulnerability identifier: #VU151412
CSH Severity: Low
CVSS v4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-90076
CWE-ID: CWE-190
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 an integer overflow in the fq qdisc initialization function fq_init() when initializing an fq qdisc for a device with a huge MTU. A local user can configure a device with an excessively large MTU to cause a denial of service.
Exploitation requires CAP_NET_ADMIN in a user namespace and an MTU plus hard_header_len large enough to make 2 * psched_mtu() wrap.
Affected software
Linux kernel
How to mitigate CVE-2026-90076
Install security update from vendor's repository.