CVE-2026-74467 s390/qeth: Check CAP_NET_ADMIN for private ioctls
Unprivileged users can invoke restricted s390/qeth network driver ioctls due to missing capability checks, potentially leading to privilege escalation.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-74467?
CVE-2026-74467 is a high-severity missing authorization vulnerability in Linux, published on 15 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
s390/qeth: Check CAP_NET_ADMIN for private ioctls
Gate the SIOCDEVPRIVATE ioctl commands SIOC_QETH_ADP_SET_SNMP_CONTROL, SIOC_QETH_GET_CARD_TYPE and SIOC_QETH_QUERY_OAT with CAP_NET_ADMIN capable check to ensure unprivileged users cannot invoke them.
Which versions are affected by CVE-2026-74467?
How do I fix CVE-2026-74467?
Apply the vendor's patch.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-74467 being exploited?
There is no known exploitation of CVE-2026-74467 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-74467, DEBIAN-CVE-2026-74467, GHSA-gc56-w4qv-mcc4, UBUNTU-CVE-2026-74467.