CVE-2026-75944 Race condition in EOS
A race condition in Arista EOS can leave stale ACL entries that incorrectly grant access to new supplicants after an agent restart.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-75944?
CVE-2026-75944 is a medium-severity vulnerability in Arista Networks EOS, published on 14 Sep 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
A race condition during supplicant re-authentication may leave a stale ACL entry that persists in the system. If the AclAgent subsequently restarts, this stale entry may be applied to new supplicants, resulting in incorrect access control enforcement. User interaction (an AclAgent restart by an administrator) is required for the unintended behavior to take effect.
Weakness: CWE-459
Which versions are affected by CVE-2026-75944?
How do I fix CVE-2026-75944?
No fix has been published for CVE-2026-75944 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-75944 being exploited?
There is no known exploitation of CVE-2026-75944 in the wild and no public exploit code.
Sources
Also known as GHSA-h9qv-gg29-5v6f.