Bug 2063219 (CVE-2021-39686) - CVE-2021-39686 kernel: race condition in the Android binder driver could lead to incorrect security checks
Summary: CVE-2021-39686 kernel: race condition in the Android binder driver could lead...
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2021-39686
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2063220
Blocks: 2063221
TreeView+ depends on / blocked
 
Reported: 2022-03-11 14:29 UTC by Guilherme de Almeida Suckevicz
Modified: 2022-03-15 22:01 UTC (History)
49 users (show)

Fixed In Version: Kernel 5.14.18
Doc Type: If docs needed, set a value
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Clone Of:
Environment:
Last Closed: 2022-03-15 22:01:25 UTC


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Description Guilherme de Almeida Suckevicz 2022-03-11 14:29:10 UTC
A race condition was discovered in the Android binder driver, that could lead to incorrect security checks. On systems where the binder driver is loaded, a local user could exploit this for privilege escalation.

References and upstream patches:
https://source.android.com/security/bulletin/2022-03-01
https://android.googlesource.com/kernel/common/+/d49297739550
https://android.googlesource.com/kernel/common/+/3af7a2f61023
https://android.googlesource.com/kernel/common/+/11db2de0af2a
https://android.googlesource.com/kernel/common/+/a4eacf3227bd

Comment 1 Guilherme de Almeida Suckevicz 2022-03-11 14:30:12 UTC
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2063220]

Comment 2 Justin M. Forbes 2022-03-11 16:51:05 UTC
This was fixed for Fedora with the 5.14.18 stable kernel updates.

Comment 3 Rohit Keshri 2022-03-15 15:54:34 UTC
There was no source built with CONFIG_ANDROID_BINDER_IPC option in any of the shipped RHEL kernel versions.

Comment 6 Product Security DevOps Team 2022-03-15 22:01:21 UTC
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2021-39686


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