{"schema_version":"1.9.0","id":"PUB-A-197850306","published":"2022-03-01T00:00:00Z","modified":"2026-09-11T15:42:03.104094163Z","aliases":["A-197850306","CVE-2021-21781"],"details":"In get_signal_page of signal.c, there is a possible leak of kernel data due to uninitialized data. This could lead to local information disclosure 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":":2022-03-05"}]}],"versions":["Kernel"],"ecosystem_specific":{"fixes":["https://android.googlesource.com/kernel/common/+/9c698bff66ab4914bb3d71da7dc6112519bde23e"],"severity":"Moderate","spl":"2022-03-05","types":["ID"],"vanir_signatures":[{"deprecated":false,"digest":{"function_hash":"339938110582185630156828205763765012574","length":434},"id":"PUB-A-197850306-924ef2dd","signature_type":"Function","signature_version":"v1","source":"https://android.googlesource.com/kernel/common/+/9c698bff66ab4914bb3d71da7dc6112519bde23e","target":{"file":"arch/arm/kernel/signal.c","function":"get_signal_page"}},{"deprecated":false,"digest":{"line_hashes":["172204053961297124746774733749632148791","58795547544708646071616854173628155454","78885293706127269740668196881614618451","282123551804674408836246440921981886827","50806308092549919788233337242074328280","89133989655327505921688482792177943628","296969725280413361612768861898306249329","36271020927615339050770287798758887251"],"threshold":0.9},"id":"PUB-A-197850306-bf7555fa","signature_type":"Line","signature_version":"v1","source":"https://android.googlesource.com/kernel/common/+/9c698bff66ab4914bb3d71da7dc6112519bde23e","target":{"file":"arch/arm/kernel/signal.c"}}]},"database_specific":{"source":"https://storage.googleapis.com/android-osv/PUB-A-197850306.json"}}],"references":[{"type":"ADVISORY","url":"https://source.android.com/security/bulletin/2022-03-01"},{"type":"FIX","url":"https://android.googlesource.com/kernel/common/+/9c698bff66ab4914bb3d71da7dc6112519bde23e"}]}