Actively exploited · Published Dec 15, 2021 · Assigned by google_android

CVE-2021-1048

High 7.8 Exploited

In plain English

A high-severity use-after-free in Android. Attackers are actively exploiting it in the wild (listed by CISA on May 23, 2022). The chance it is exploited in the next 30 days is estimated at 1.1% (higher than 65% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.8High

Exploit odds (30 days)1.1%top 35.4% of all CVEs

Exploited in the wildYesCISA KEV since May 23, 2022

Attack toolingNoneno public tooling known

CISA guidance

Apply updates per vendor instructions.

Federal agencies must remediate by Jun 13, 2022.

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	linux	5.8.10-1	DEBIAN-CVE-2021-1048
Debian:13	linux	5.8.10-1	DEBIAN-CVE-2021-1048
Debian:14	linux	5.8.10-1	DEBIAN-CVE-2021-1048
Ubuntu:22.04:LTS	linux-intel-iot-realtime	no fix listed	UBUNTU-CVE-2021-1048
Ubuntu:24.04:LTS	linux-raspi-realtime	no fix listed	UBUNTU-CVE-2021-1048
Ubuntu:22.04:LTS	linux-realtime	no fix listed	UBUNTU-CVE-2021-1048

Affected products (as reported)

Vendor	Product	Versions
n/a	Android	Android kernel

Weakness: CWE-416 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

https://source.android.com/security/bulletin/2021-11-01 x_refsource_MISC
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-1048 government-resource