CVE-2021-39656

NameCVE-2021-39656
DescriptionIn __configfs_open_file of file.c, there is a possible use-after-free due to improper locking. This could lead to local escalation of privilege in the kernel with System execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-174049066References: Upstream kernel
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
NVD severitymedium

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
linux (PTS)stretch4.9.228-1vulnerable
stretch (security)4.9.290-1fixed
buster4.19.208-1fixed
buster (security)4.19.194-3fixed
bullseye5.10.84-1fixed
bullseye (security)5.10.46-5fixed
bookworm, sid5.15.5-2fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
linuxsourcestretch4.9.272-1
linuxsourcebuster4.19.181-1
linuxsource(unstable)5.10.24-1

Notes

https://source.android.com/security/bulletin/pixel/2021-12-01
https://git.kernel.org/linus/14fbbc8297728e880070f7b077b3301a8c698ef9 (5.12-rc3)

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