{"id":"UBUNTU-CVE-2021-39800","details":"In ion_ioctl of ion-ioctl.c, there is a possible way to leak kernel head data due to a use after free. This could lead to local information disclosure with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-208277166References: Upstream kernel","modified":"2026-09-22T22:52:19.922688965Z","published":"2022-04-12T17:15:00Z","upstream":["CVE-2021-39800"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-39800"},{"type":"REPORT","url":"https://source.android.com/security/bulletin/2022-04-01"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2021-39800"}],"affected":[{"package":{"name":"linux-oem-5.13","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/linux-oem-5.13?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.13.0-1009.10","5.13.0-1010.11","5.13.0-1012.16","5.13.0-1014.18","5.13.0-1017.21","5.13.0-1019.23","5.13.0-1020.24","5.13.0-1021.25","5.13.0-1022.26","5.13.0-1026.32","5.13.0-1028.35","5.13.0-1029.36"],"ecosystem_specific":{"binaries":[{"binary_name":"linux-buildinfo-5.13.0-1029-oem","binary_version":"5.13.0-1029.36"},{"binary_version":"5.13.0-1029.36","binary_name":"linux-headers-5.13.0-1029-oem"},{"binary_name":"linux-image-unsigned-5.13.0-1029-oem","binary_version":"5.13.0-1029.36"},{"binary_name":"linux-modules-5.13.0-1029-oem","binary_version":"5.13.0-1029.36"},{"binary_version":"5.13.0-1029.36","binary_name":"linux-oem-5.13-headers-5.13.0-1029"},{"binary_name":"linux-oem-5.13-tools-5.13.0-1029","binary_version":"5.13.0-1029.36"},{"binary_version":"5.13.0-1029.36","binary_name":"linux-oem-5.13-tools-host"},{"binary_name":"linux-tools-5.13.0-1029-oem","binary_version":"5.13.0-1029.36"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-39800.json"}},{"package":{"name":"linux-riscv-5.11","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/linux-riscv-5.11?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.11.0-1015.16~20.04.1","5.11.0-1017.18~20.04.1","5.11.0-1018.19~20.04.2","5.11.0-1020.21~20.04.1","5.11.0-1021.22~20.04.1","5.11.0-1022.23~20.04.1","5.11.0-1023.24~20.04.1","5.11.0-1024.25~20.04.1","5.11.0-1026.28~20.04.1","5.11.0-1028.31~20.04.1","5.11.0-1029.32~20.04.1","5.11.0-1030.34","5.11.0-1031.35"],"ecosystem_specific":{"binaries":[{"binary_version":"5.11.0-1031.35","binary_name":"linux-buildinfo-5.11.0-1031-generic"},{"binary_name":"linux-headers-5.11.0-1031-generic","binary_version":"5.11.0-1031.35"},{"binary_name":"linux-image-5.11.0-1031-generic","binary_version":"5.11.0-1031.35"},{"binary_version":"5.11.0-1031.35","binary_name":"linux-modules-5.11.0-1031-generic"},{"binary_version":"5.11.0-1031.35","binary_name":"linux-modules-extra-5.11.0-1031-generic"},{"binary_name":"linux-riscv-5.11-headers-5.11.0-1031","binary_version":"5.11.0-1031.35"},{"binary_name":"linux-riscv-5.11-tools-5.11.0-1031","binary_version":"5.11.0-1031.35"},{"binary_version":"5.11.0-1031.35","binary_name":"linux-tools-5.11.0-1031-generic"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-39800.json"}},{"package":{"name":"linux-riscv-5.8","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/linux-riscv-5.8?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.8.0-14.16~20.04.1","5.8.0-14.16~20.04.3","5.8.0-16.18~20.04.1","5.8.0-17.19~20.04.1","5.8.0-18.20~20.04.1","5.8.0-20.22~20.04.1","5.8.0-22.24~20.04.1","5.8.0-25.27~20.04.1","5.8.0-26.28~20.04.1","5.8.0-29.31~20.04.1"],"ecosystem_specific":{"binaries":[{"binary_version":"5.8.0-29.31~20.04.1","binary_name":"block-modules-5.8.0-29-generic-di"},{"binary_name":"crypto-modules-5.8.0-29-generic-di","binary_version":"5.8.0-29.31~20.04.1"},{"binary_name":"fat-modules-5.8.0-29-generic-di","binary_version":"5.8.0-29.31~20.04.1"},{"binary_name":"firewire-core-modules-5.8.0-29-generic-di","binary_version":"5.8.0-29.31~20.04.1"},{"binary_name":"fs-core-modules-5.8.0-29-generic-di","binary_version":"5.8.0-29.31~20.04.1"},{"binary_version":"5.8.0-29.31~20.04.1","binary_name":"fs-secondary-modules-5.8.0-29-generic-di"},{"binary_version":"5.8.0-29.31~20.04.1","binary_name":"input-modules-5.8.0-29-generic-di"},{"binary_version":"5.8.0-29.31~20.04.1","binary_name":"ipmi-modules-5.8.0-29-generic-di"},{"binary_name":"kernel-image-5.8.0-29-generic-di","binary_version":"5.8.0-29.31~20.04.1"},{"binary_name":"linux-buildinfo-5.8.0-29-generic","binary_version":"5.8.0-29.31~20.04.1"},{"binary_name":"linux-headers-5.8.0-29-generic","binary_version":"5.8.0-29.31~20.04.1"},{"binary_name":"linux-image-5.8.0-29-generic","binary_version":"5.8.0-29.31~20.04.1"},{"binary_name":"linux-modules-5.8.0-29-generic","binary_version":"5.8.0-29.31~20.04.1"},{"binary_name":"linux-modules-extra-5.8.0-29-generic","binary_version":"5.8.0-29.31~20.04.1"},{"binary_name":"linux-riscv-5.8-headers-5.8.0-29","binary_version":"5.8.0-29.31~20.04.1"},{"binary_name":"linux-riscv-5.8-tools-5.8.0-29","binary_version":"5.8.0-29.31~20.04.1"},{"binary_name":"linux-tools-5.8.0-29-generic","binary_version":"5.8.0-2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