Use-after-free in Linux kernel ION handler



Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-39801
CWE-ID CWE-416
Exploitation vector Local
Public exploit N/A
Vulnerable software
 Linux kernel
Operating systems & Components / Operating system

Vendor Linux Foundation

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Use-after-free

EUVDB-ID: #VU61997

Risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-39801

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a use-after-free error in ION_IOC_ALLOC in Linux kernel. A local user can send a specially crafted IOCTL request, trigger a use-after-free error and execute arbitrary code with elevated privileges.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Linux kernel: All versions

CPE2.3 External links

https://source.android.com/security/bulletin/2022-04-01#details-05
https://android.googlesource.com/kernel/common/+/504e1d6ee65d5
https://android.googlesource.com/kernel/common/+/a8200613c8c9f
https://android.googlesource.com/kernel/common/+/c47385c73fced


Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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