CVE-2025-26403 Memory corruption in Intel(R) Xeon(R) 6 processors when using Intel(R) SGX or Intel(R) TDX
A privileged local attacker can exploit an out-of-bounds write in Intel Xeon SGX/TDX memory subsystems to escalate privileges.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-26403?
CVE-2025-26403 is a medium-severity memory corruption vulnerability in Intel(R) Xeon(R) 6 processors when using Intel(R) SGX or Intel(R) TDX, published on 12 Aug 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Out-of-bounds write in the memory subsystem for some Intel(R) Xeon(R) 6 processors when using Intel(R) SGX or Intel(R) TDX may allow a privileged user to potentially enable escalation of privilege via local access.
Weakness: CWE-787
Which versions are affected by CVE-2025-26403?
How do I fix CVE-2025-26403?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2025-26403 being exploited?
There is no known exploitation of CVE-2025-26403 in the wild and no public exploit code.
Sources
Also known as ALPINE-CVE-2025-26403, BELL-CVE-2025-26403, DEBIAN-CVE-2025-26403, GHSA-7gf7-6hqr-6chr, UBUNTU-CVE-2025-26403.