CVE-2021-3732

NameCVE-2021-3732
DescriptionA security issue was found in Linux kernel’s OverlayFS subsystem where a local attacker who has the ability to mount the TmpFS filesystem with OverlayFS can abuse a logic bug in the overlayfs code which can inadvertently reveal files hidden in the original mount.
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)
ReferencesDLA-2785-1, DLA-2843-1, DSA-4978-1, ELA-535-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
linux (PTS)jessie, jessie (lts)3.16.84-1vulnerable
stretch (security), stretch (lts), stretch4.9.320-2fixed
buster4.19.235-1fixed
buster (security)4.19.249-2fixed
bullseye5.10.127-1fixed
bullseye (security)5.10.127-2fixed
bookworm5.18.14-1fixed
sid5.18.16-1fixed
linux-4.19 (PTS)stretch (security)4.19.232-1~deb9u1fixed
stretch (lts), stretch4.19.249-2~deb9u1fixed
linux-4.9 (PTS)jessie, jessie (lts)4.9.303-1~deb8u3fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
linuxsourcejessie(unfixed)end-of-life
linuxsourcestretch4.9.290-1DLA-2843-1
linuxsourcebuster4.19.208-1
linuxsourcebullseye5.10.46-5DSA-4978-1
linuxsource(unstable)5.14.6-1
linux-4.19sourcestretch4.19.208-1~deb9u1DLA-2785-1
linux-4.9sourcejessie4.9.290-1~deb8u1ELA-535-1

Notes

https://bugzilla.redhat.com/show_bug.cgi?id=1995249
https://git.kernel.org/linus/427215d85e8d1476da1a86b8d67aceb485eb3631

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