{"id":"ASB-A-204450605", "published":"2022-01-01T00:00:00Z", "modified":"2026-07-09T15:25:53.339171538Z", "aliases":["CVE-2021-39634", "A-204450605"], "details":"In fs/eventpoll.c, there is a possible use after free. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.", "affected":[{"package":{"name":":linux_kernel:", "ecosystem":"Android"}, "ranges":[{"type":"ECOSYSTEM", "events":[{"introduced":":0"}, {"fixed":":2022-01-05"}]}], "versions":["Kernel"], "ecosystem_specific":{"fixes":["https://android.googlesource.com/kernel/common/+/f8d4f44df056c5b504b0d49683fb7279218fd207"], "severity":"High", "spl":"2022-01-05", "types":["EoP"], "vanir_signatures":[{"deprecated":false, "digest":{"line_hashes":["281761851118573238417064251091957666292", "66716452289808523718992946986435002294", "238149171707000430488825594700649822945", "26136525765657484005842846464340498509", "193067148266005416477872802859470790853", "88756201235542557271698617933401552938", "150508037877092615736382668588997730010", "184785842090014470300364861830991826586", "124012108907255222333292463384886727462", "14754910811055373754744278323106510798", "338422229912443275097368711427458621123", "257191157499221204848855334260604081658", "151321889986198462900830560716771511738", "72932826716581820486295703700363087347", "111228602360053789999847191490887625423", "179870949799274072871931870297664388759", "161516205867268128265865626947277960082", "226742925649578267199794237924187415355", "295112841176974074523191062608716452742", "111738587607780391033359608457242647485", "2129751208561844047623001376462740887"], "threshold":0.9}, "id":"ASB-A-204450605-c6a19363", "signature_type":"Line", "signature_version":"v1", "source":"https://android.googlesource.com/kernel/common/+/f8d4f44df056c5b504b0d49683fb7279218fd207", "target":{"file":"fs/eventpoll.c"}}, {"deprecated":false, "digest":{"function_hash":"6325098871493236007769009914198357004", "length":2004}, "id":"ASB-A-204450605-d2d6789d", "signature_type":"Function", "signature_version":"v1", "source":"https://android.googlesource.com/kernel/common/+/f8d4f44df056c5b504b0d49683fb7279218fd207", "target":{"file":"fs/eventpoll.c", "function":"ep_insert"}}]}}], "references":[{"type":"ADVISORY", "url":"https://source.android.com/security/bulletin/2022-01-01"}, {"type":"FIX", "url":"https://android.googlesource.com/kernel/common/+/f8d4f44df056c5b504b0d49683fb7279218fd207"}]}