Provide references for CVE-2021-27138.
Where can I find more information about CVE-2021-27138?
References are available at: https://github.com/u-boot/u-boot/commit/b6f4c757959f8850e1299a77c8e5713da78e8ec0, https://github.com/u-boot/u-boot/commit/3f04db891a353f4b127ed57279279f851c6b4917, https://github.com/u-boot/u-boot/commit/79af75f7776fc20b0d7eb6afe1e27c00fdb4b9b4.