CVE-2021-39698 Use after free in Android
A use-after-free in the Android kernel allows local attackers to escalate privileges without user interaction or additional execution privileges.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-39698?
CVE-2021-39698 is a high-severity use after free vulnerability in Google Android, published on 16 Mar 2022. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In aio_poll_complete_work of aio.c, there is a possible memory corruption 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-185125206References: Upstream kernel
Weakness: CWE-416
Which versions are affected by CVE-2021-39698?
It affects 1 product.
Linux distribution packages (4)
kernel-livepatch-SLE15-SP3_Update_18 SUSE:Linux Enterprise Live Patching 15 SP3 | All versions | 2-150300.2.2 |
kernel-livepatch-SLE15-SP3_Update_24 SUSE:Linux Enterprise Live Patching 15 SP3 | All versions | 2-150300.2.2 |
kernel-livepatch-SLE15-SP4_Update_3 SUSE:Linux Enterprise Live Patching 15 SP4 | All versions | 2-150400.2.2 |
kernel-livepatch-SLE15-SP4_Update_4 SUSE:Linux Enterprise Live Patching 15 SP4 | All versions | 2-150400.2.1 |
Products include Google Android.
How do I fix CVE-2021-39698?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2021-39698 being exploited?
There is no known exploitation of CVE-2021-39698 in the wild and no public exploit code.
Other vulnerabilities in Google Android
Sources
Also known as A-185125206, ASB-A-185125206, DEBIAN-CVE-2021-39698, GHSA-32r8-256r-q9p6, SUSE-SU-2022:1989-1, SUSE-SU-2022:3411-1 and 2 more.