{"id":"CVE-2021-1048","aliases":["A-204573007","ASB-A-204573007","DEBIAN-CVE-2021-1048","EUVD-2021-6515","GHSA-r535-rfwp-fm57","UBUNTU-CVE-2021-1048"],"status":"published","title":"In ep_loop_check_proc of eventpoll.c, there is a possible way to corrupt memory due to a use...","description":"In ep_loop_check_proc of eventpoll.c, there is a possible way to corrupt memory due to a use after free. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-204573007References: Upstream kernel","severity":{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-12","score":0.01058,"percentile":0.64937,"model":"v2026.06.15"},"facts":{"in_kev":true,"known_exploited":true,"public_exploit":false,"fix_available":true},"cwes":["CWE-416"],"published":"2021-11-01T00:00:00Z","modified":"2026-10-30T16:11:27Z","kev":{"date_added":"2022-05-23","due_date":"2022-06-13","required_action":"Apply updates per vendor instructions.","known_ransomware_use":"Unknown"},"exploitation":[{"source":"euvd","since":"2022-05-23"},{"source":"kev","since":"2022-05-23"}],"fixes":[{"ecosystem":"Android","package":":linux_kernel:","fixed_in":[":2021-11-06"],"sources":["osv"]},{"ecosystem":"Debian:12","package":"linux","fixed_in":["5.8.10-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"linux","fixed_in":["5.8.10-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"linux","fixed_in":["5.8.10-1"],"sources":["osv"]},{"ecosystem":"Ubuntu:Pro:14.04:LTS","package":"linux-azure","fixed_in":["4.15.0-1100.111~14.04.1"],"sources":["osv"]},{"ecosystem":"Ubuntu:16.04:LTS","package":"linux-aws-hwe","fixed_in":["4.15.0-1088.93~16.04.1"],"sources":["osv"]},{"ecosystem":"Ubuntu:16.04:LTS","package":"linux-azure","fixed_in":["4.15.0-1100.111~16.04.1"],"sources":["osv"]},{"ecosystem":"Ubuntu:16.04:LTS","package":"linux-gcp","fixed_in":["4.15.0-1088.101~16.04.1"],"sources":["osv"]},{"ecosystem":"Ubuntu:16.04:LTS","package":"linux-hwe","fixed_in":["4.15.0-126.129~16.04.1"],"sources":["osv"]},{"ecosystem":"Ubuntu:16.04:LTS","package":"linux-oracle","fixed_in":["4.15.0-1059.65~16.04.1"],"sources":["osv"]},{"ecosystem":"Ubuntu:18.04:LTS","package":"linux","fixed_in":["4.15.0-126.129"],"sources":["osv"]},{"ecosystem":"Ubuntu:18.04:LTS","package":"linux-aws","fixed_in":["4.15.0-1088.93"],"sources":["osv"]},{"ecosystem":"Ubuntu:18.04:LTS","package":"linux-azure-4.15","fixed_in":["4.15.0-1100.111"],"sources":["osv"]},{"ecosystem":"Ubuntu:18.04:LTS","package":"linux-dell300x","fixed_in":["4.15.0-1007.11"],"sources":["osv"]},{"ecosystem":"Ubuntu:18.04:LTS","package":"linux-gcp-4.15","fixed_in":["4.15.0-1088.101"],"sources":["osv"]},{"ecosystem":"Ubuntu:18.04:LTS","package":"linux-kvm","fixed_in":["4.15.0-1079.81"],"sources":["osv"]},{"ecosystem":"Ubuntu:18.04:LTS","package":"linux-oracle","fixed_in":["4.15.0-1059.65"],"sources":["osv"]},{"ecosystem":"Ubuntu:18.04:LTS","package":"linux-raspi2","fixed_in":["4.15.0-1074.79"],"sources":["osv"]},{"ecosystem":"Ubuntu:18.04:LTS","package":"linux-snapdragon","fixed_in":["4.15.0-1091.100"],"sources":["osv"]},{"ecosystem":"Ubuntu:Pro:FIPS-updates:18.04:LTS","package":"linux-aws-fips","fixed_in":["4.15.0-2031.32"],"sources":["osv"]},{"ecosystem":"Ubuntu:Pro:FIPS-updates:18.04:LTS","package":"linux-azure-fips","fixed_in":["4.15.0-2013.15"],"sources":["osv"]},{"ecosystem":"Ubuntu:Pro:FIPS-updates:18.04:LTS","package":"linux-fips","fixed_in":["4.15.0-1046.53"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Android","package":":linux_kernel:","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":":0"},{"fixed":":2021-11-06"}]}],"versions":["Kernel"]},{"source":"osv","ecosystem":"Debian:12","package":"linux","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.8.10-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"linux","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.8.10-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"linux","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.8.10-1"}]}]},{"source":"osv","ecosystem":"Ubuntu:Pro:14.04:LTS","package":"linux-azure","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.15.0-1100.111~14.04.1"}]}],"versions":["4.15.0-1023.24~14.04.1","4.15.0-1030.31~14.04.1","4.15.0-1031.32~14.04.1","4.15.0-1032.33~14.04.2","4.15.0-1035.36~14.04.2","4.15.0-1036.38~14.04.2","4.15.0-1037.39~14.04.2","4.15.0-1039.41~14.04.2","4.15.0-1040.44~14.04.1","4.15.0-1041.45~14.04.1","4.15.0-1042.46~14.04.1","4.15.0-1045.49~14.04.1","4.15.0-1046.50~14.04.1","4.15.0-1047.51~14.04.1","4.15.0-1049.54~14.04.1","4.15.0-1050.55~14.04.1","4.15.0-1051.56~14.04.1","4.15.0-1052.57~14.04.1","4.15.0-1055.60~14.04.1","4.15.0-1056.61~14.04.1","4.15.0-1057.62~14.04.1","4.15.0-1059.64~14.04.1","4.15.0-1060.65~14.04.1","4.15.0-1061.66~14.04.1","4.15.0-1063.68~14.04.1","4.15.0-1064.69~14.04.1","4.15.0-1066.71~14.04.1","4.15.0-1067.72~14.04.1","4.15.0-1069.74~14.04.1","4.15.0-1071.76~14.04.1","4.15.0-1074.79~14.04.1","4.15.0-1077.82~14.04.1","4.15.0-1082.92~14.04.1","4.15.0-1083.93~14.04.1","4.15.0-1089.99~14.04.1","4.15.0-1091.101~14.04.1","4.15.0-1092.102~14.04.1","4.15.0-1093.103~14.04.1","4.15.0-1095.105~14.04.1","4.15.0-1096.106~14.04.1","4.15.0-1098.109~14.04.1"]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"linux-aws-hwe","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.15.0-1088.93~16.04.1"}]}],"versions":["4.15.0-1030.31~16.04.1","4.15.0-1031.33~16.04.1","4.15.0-1032.34~16.04.1","4.15.0-1033.35~16.04.1","4.15.0-1035.37~16.04.1","4.15.0-1036.38~16.04.1","4.15.0-1039.41~16.04.1","4.15.0-1040.42~16.04.1","4.15.0-1041.43~16.04.1","4.15.0-1043.45~16.04.1","4.15.0-1044.46~16.04.1","4.15.0-1045.47~16.04.1","4.15.0-1047.49~16.04.1","4.15.0-1048.50~16.04.1","4.15.0-1050.52~16.04.1","4.15.0-1051.53~16.04.1","4.15.0-1052.54~16.04.1","4.15.0-1054.56~16.04.1","4.15.0-1056.58~1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User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-204573007References: Upstream kernel","status":"published","published":"2021-12-15T18:05:35Z","modified":"2025-10-21T23:15:50Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"exploited_since":"2022-05-23","updated_at":"2026-11-02T20:31:25.901288Z"}],"ghsa":[{"id":"GHSA-r535-rfwp-fm57","title":"In ep_loop_check_proc of eventpoll.c, there is a possible way to corrupt memory due to a use...","description":"In ep_loop_check_proc of eventpoll.c, there is a possible way to corrupt memory due to a use after free. This could lead to local escalation of privilege with no additional execution privileges needed. 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User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-204573007References: Upstream kernel","status":"published","published":"2021-12-15T19:15:14.917Z","modified":"2026-10-23T18:03:28.083342776Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:45:34.311861Z"},{"id":"UBUNTU-CVE-2021-1048","description":"In ep_loop_check_proc of eventpoll.c, there is a possible way to corrupt memory due to a use after free. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-204573007References: Upstream kernel","status":"published","published":"2021-12-15T19:15:00Z","modified":"2026-04-22T12:44:13.430157Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"},{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:54:25.728622Z"},{"id":"ASB-A-204573007","description":"In ep_loop_check_proc of eventpoll.c, there is a possible way to corrupt memory due to a use after free. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.","status":"published","published":"2021-11-01T00:00:00Z","modified":"2026-11-10T17:02:23.040266809Z","updated_at":"2026-11-09T17:04:22.742827Z"}]}}