CVE-2026-6924 Weak entropy initialization in Silicon Labs Matter SiWx917 TinyCrypt path
Predictable random number generation in Silicon Labs Matter firmware allows attackers to bypass cryptographic security controls.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-6924?
CVE-2026-6924 is a high-severity vulnerability in Silicon Labs Matter Github, published on 23 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A bug in the entropy initialization for SiWx917 causes the DRBG to use a predictable seed. As such, all random numbers generated in the Matter code use the same stream of numbers. This vulnerability was discovered after the impacted repository was already deprecated.
Weakness: CWE-336
Which versions are affected by CVE-2026-6924?
How do I fix CVE-2026-6924?
No fix has been published for CVE-2026-6924 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-6924 being exploited?
There is no known exploitation of CVE-2026-6924 in the wild and no public exploit code.
Sources
Also known as GHSA-wm5h-r2qh-r97h.