DescriptionIt was discovered that aufs improperly managed inode reference counts in the vfsub_dentry_open() method. A local attacker could use this vulnerability to cause a denial of service attack.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs964748

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
aufs (PTS)buster4.19+20190211-1vulnerable

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs


[buster] - aufs <no-dsa> (Minor issue; CONFIG_IMA not enabled in kernel; can be fixed via point release)
[stretch] - aufs <ignored> (Minor issue; too many other aufs issues open)
To exploit the issue CONFIG_IMA in Kernel needs to be enabled.
linux/4.9.y had the config enabled, but was disabled in later versions
including linux/4.19.y.

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