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OpenAdvisories
High · 7.8 Known exploited CVE-2021-1048 EUVD-2021-6515GHSA-r535-rfwp-fm57

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 escalatio…

Published Dec 15, 2021 · Updated Oct 21, 2025 · Assigned by google_android

Package: linux Package: linux Package: linux-aws Package: linux-aws-5.0 Package: linux-aws-5.3 Package: linux-aws-5.8 Package: linux-aws-fips Package: linux-aws-hwe Package: linux-azure Package: linux-azure-4.15 Package: linux-azure-5.3 Package: linux-azure-5.8 Package: linux-azure-edge Package: linux-azure-fips Package: linux-dell300x Package: linux-fips Package: linux-gcp Package: linux-gcp-4.15 Package: linux-gcp-5.3 Package: linux-gcp-5.8 Package: linux-gke-4.15 Package: linux-hwe Package: linux-hwe-5.8 Package: linux-hwe-edge Package: linux-intel-5.13 Package: linux-intel-iot-realtime Package: linux-kvm Package: linux-oem Package: linux-oem-5.6 Package: linux-oracle Package: linux-oracle-5.0 Package: linux-oracle-5.3 Package: linux-oracle-5.8 Package: linux-raspi-realtime Package: linux-raspi2 Package: linux-realtime Package: linux-riscv Package: linux-riscv-5.8 Package: linux-snapdragon Platform: Android Ecosystem: Debian Ecosystem: Ubuntu

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

Affected products

VendorProductAffectedFixed
— Android Android kernel —

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

Debian

Security tracker ↗
ReleasePackageFixed inAdvisory
Debian 14 linux 5.8.10-1 —
Debian 13 linux 5.8.10-1 —
Debian 12 linux 5.8.10-1 —

Ubuntu

Security tracker ↗
ReleasePackageFixed inAdvisory
Ubuntu 24.04 LTS linux-raspi-realtime No fix yet —
Ubuntu 22.04 LTS linux-realtime +1 No fix yet —
Ubuntu 20.04 LTS linux-riscv +9 No fix yet —
Ubuntu 18.04 LTS linux 4.15.0-126.129 —
Ubuntu 18.04 LTS linux-aws 4.15.0-1088.93 —
Ubuntu 18.04 LTS linux-azure-4.15 4.15.0-1100.111 —
Ubuntu 18.04 LTS linux-dell300x 4.15.0-1007.11 —
Ubuntu 18.04 LTS linux-gcp +11 No fix yet —
Ubuntu 18.04 LTS linux-gcp-4.15 4.15.0-1088.101 —
Ubuntu 18.04 LTS linux-kvm 4.15.0-1079.81 —
Ubuntu 18.04 LTS linux-oracle 4.15.0-1059.65 —
Ubuntu 18.04 LTS linux-raspi2 4.15.0-1074.79 —
Ubuntu 18.04 LTS linux-snapdragon 4.15.0-1091.100 —
Ubuntu 16.04 LTS linux-aws-hwe 4.15.0-1088.93~16.04.1 —
Ubuntu 16.04 LTS linux-azure 4.15.0-1100.111~16.04.1 —
Ubuntu 16.04 LTS linux-gcp 4.15.0-1088.101~16.04.1 —
Ubuntu 16.04 LTS linux-hwe 4.15.0-126.129~16.04.1 —
Ubuntu 16.04 LTS linux-hwe-edge No fix yet —
Ubuntu 16.04 LTS linux-oracle 4.15.0-1059.65~16.04.1 —
Show 2 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Ubuntu Pro FIPS-updates 18.04 LTS linux-aws-fips 4.15.0-2031.32 —
Ubuntu Pro FIPS-updates 18.04 LTS linux-azure-fips 4.15.0-2013.15 —
Ubuntu Pro FIPS-updates 18.04 LTS linux-fips 4.15.0-1046.53 —
Ubuntu Pro 14.04 LTS linux-azure 4.15.0-1100.111~14.04.1 —

Oracle Linux

ReleasePackageFixed inAdvisory
Oracle Linux 7 kernel-uek +5 4.1.12-124.59.1.2.el7uek ELSA-2022-9088, ELSA-2022-9014

Advisories 3

References