CVE-2021-3714

NameCVE-2021-3714
DescriptionA flaw was found in the Linux kernels memory deduplication mechanism. Previous work has shown that memory deduplication can be attacked via a local exploitation mechanism. The same technique can be used if an attacker can upload page sized files and detect the change in access time from a networked service to determine if the page has been merged.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
linux (PTS)buster4.19.249-2vulnerable (unimportant)
buster (security)4.19.304-1vulnerable (unimportant)
bullseye5.10.209-2vulnerable (unimportant)
bullseye (security)5.10.205-2vulnerable (unimportant)
bookworm6.1.76-1vulnerable (unimportant)
bookworm (security)6.1.69-1vulnerable (unimportant)
trixie6.6.15-2vulnerable (unimportant)
sid6.7.9-2vulnerable (unimportant)

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
linuxsource(unstable)(unfixed)unimportant

Notes

https://bugzilla.redhat.com/show_bug.cgi?id=1931327
Inherent design limitation, can be avoided by not using KSM

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