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CVE-2021-38300

Description

arch/mips/net/bpf_jit.c in the Linux kernel before 5.4.10 can generate undesirable machine code when transforming unprivileged cBPF programs, allowing execution of arbitrary code within the kernel context. This occurs because conditional branches can exceed the 128 KB limit of the MIPS architecture.

POC

Reference

- http://www.openwall.com/lists/oss-security/2021/09/15/5

- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14.10

- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=37cb28ec7d3a36a5bace7063a3dba633ab110f8b

Github

No PoCs found on GitHub currently.