google/syzkaller

syzkaller is an unsupervised coverage-guided kernel fuzzer

6,320

stars

12,312

commits

Go

primary language

Sep 7, 2026

updated

fuzzer
fuzzing
fuzz-testing
kernel
linux
security
security-tools
security-vulnerability
testing

README

syzkaller - kernel fuzzer

CI Status OSS-Fuzz Go Report Card Coverage Status GoDoc License

syzkaller ([siːzˈkɔːlə]) is an unsupervised coverage-guided kernel fuzzer.
Supported OSes: FreeBSD, Fuchsia, gVisor, Linux, NetBSD, OpenBSD, Windows.

Mailing list: syzkaller@googlegroups.com (join on web or by email).

Found bugs: Darwin/XNU, FreeBSD, Linux, NetBSD, OpenBSD, Windows.

Documentation

Initially, syzkaller was developed with Linux kernel fuzzing in mind, but now it's being extended to support other OS kernels as well. Most of the documentation at this moment is related to the Linux kernel. For other OS kernels check: Darwin/XNU, FreeBSD, Fuchsia, NetBSD, OpenBSD, Starnix, Windows, gVisor, Akaros.

Disclaimer

This is not an official Google product.

Contributors

(top 30 of 295)

dvyukov

5,220 commits

a-nogikh

2,207 commits

tarasmadan

723 commits

xairy

715 commits

google/syzkaller

syzkaller is an unsupervised coverage-guided kernel fuzzer

6,320

stars

12,312

commits

Go

primary language

Sep 7, 2026

updated

fuzzer
fuzzing
fuzz-testing
kernel
linux
security
security-tools
security-vulnerability
testing

README

syzkaller - kernel fuzzer

CI Status OSS-Fuzz Go Report Card Coverage Status GoDoc License

syzkaller ([siːzˈkɔːlə]) is an unsupervised coverage-guided kernel fuzzer.
Supported OSes: FreeBSD, Fuchsia, gVisor, Linux, NetBSD, OpenBSD, Windows.

Mailing list: syzkaller@googlegroups.com (join on web or by email).

Found bugs: Darwin/XNU, FreeBSD, Linux, NetBSD, OpenBSD, Windows.

Documentation

Initially, syzkaller was developed with Linux kernel fuzzing in mind, but now it's being extended to support other OS kernels as well. Most of the documentation at this moment is related to the Linux kernel. For other OS kernels check: Darwin/XNU, FreeBSD, Fuchsia, NetBSD, OpenBSD, Starnix, Windows, gVisor, Akaros.

Disclaimer

This is not an official Google product.

Contributors

(top 30 of 295)

dvyukov

5,220 commits

a-nogikh

2,207 commits

tarasmadan

723 commits

xairy

715 commits

Languages

Go

77.4%

C++

10.2%

C

7.6%

HTML

2.0%

Shell

1.1%