{"schema_version":"1.9.0","id":"PUB-A-183840808","published":"2021-07-01T00:00:00Z","modified":"2026-09-08T15:39:03.104189951Z","aliases":["A-183840808","CVE-2020-27171"],"details":"In retrieve_ptr_limit of verifier.c, there is a possible out of bounds read due to an incorrect bounds check. This could lead to local information disclosure with System execution privileges needed. User interaction is not needed for exploitation.","affected":[{"package":{"name":":linux_kernel:","ecosystem":"Android"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":":0"},{"fixed":":2021-07-05"}]}],"versions":["Kernel"],"ecosystem_specific":{"fixes":["https://android.googlesource.com/kernel/common/+/10d2bb2e6b1d8c4576c56a748f697dbeb8388899"],"severity":"Moderate","spl":"2021-07-05","types":["ID"],"vanir_signatures":[{"deprecated":false,"digest":{"line_hashes":["131279107620880597128958898542620581402","281121866354856682736356125141732049179","314176909727751513698772093427800320367","222067408734644532739403530031819964808","211363170638768455415056806454467793321","144544375619070072392668870337686575889","182335119627226422490639640347773561723","197027256484181379865102550427088873258","53489083422022700743345050693036682854","211687179292011964753669552695884888375"],"threshold":0.9},"id":"PUB-A-183840808-6833ac4b","signature_type":"Line","signature_version":"v1","source":"https://android.googlesource.com/kernel/common/+/10d2bb2e6b1d8c4576c56a748f697dbeb8388899","target":{"file":"kernel/bpf/verifier.c"}},{"deprecated":false,"digest":{"function_hash":"18717670090766123846112546191246011907","length":584},"id":"PUB-A-183840808-8c51482b","signature_type":"Function","signature_version":"v1","source":"https://android.googlesource.com/kernel/common/+/10d2bb2e6b1d8c4576c56a748f697dbeb8388899","target":{"file":"kernel/bpf/verifier.c","function":"retrieve_ptr_limit"}}]},"database_specific":{"source":"https://storage.googleapis.com/android-osv/PUB-A-183840808.json"}}],"references":[{"type":"ADVISORY","url":"https://source.android.com/security/bulletin/2021-07-01"},{"type":"FIX","url":"https://android.googlesource.com/kernel/common/+/10d2bb2e6b1d8c4576c56a748f697dbeb8388899"}]}