CVE-2026-64306 crypto: drbg - Fix returning success on failure in CTR_DRBG
A bug in the Linux kernel CTR_DRBG implementation may return success despite failure, leaving output buffers uninitialized and potentially compromising cryptographic operations.
- 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-2026-64306?
CVE-2026-64306 is a medium-severity vulnerability in Linux kernel, published on 25 Jul 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:
crypto: drbg - Fix returning success on failure in CTR_DRBG
drbg_ctr_generate() sometimes returns success when it fails, leaving the output buffer uninitialized. Fix it.
Which versions are affected by CVE-2026-64306?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-64306?
Apply the vendor's patch.
Is CVE-2026-64306 being exploited?
There is no known exploitation of CVE-2026-64306 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-93515, BELL-CVE-2026-64306, DEBIAN-CVE-2026-64306, GHSA-9h5h-wjm4-4jqg, ROOT-OS-UBUNTU-2204-CVE-2026-64306, UBUNTU-CVE-2026-64306.