The bpf verifier in the Linux kernel did not properly handle mod32 destination register truncation when the source register was known to be 0. A local attacker with the ability to load bpf programs could use this gain out-of-bounds reads in kernel memory leading to information disclosure (kernel memory), and possibly out-of-bounds writes that could potentially lead to code execution. This issue was addressed in the upstream kernel in commit 9b00f1b78809 ("bpf: Fix truncation handling for mod32 dst reg wrt zero") and in Linux stable kernels 5.11.2, 5.10.19, and 5.4.101.
| Vulnerable Product | Search on Vulmon | Subscribe to Product |
|---|---|---|
linux linux kernel |
||
debian debian linux 9.0 |
||
canonical ubuntu linux 14.04 |
||
canonical ubuntu linux 16.04 |
||
canonical ubuntu linux 18.04 |
||
canonical ubuntu linux 20.04 |
Vulmon