CVE-2018-18281

NameCVE-2018-18281
DescriptionSince Linux kernel version 3.2, the mremap() syscall performs TLB flushes after dropping pagetable locks. If a syscall such as ftruncate() removes entries from the pagetables of a task that is in the middle of mremap(), a stale TLB entry can remain for a short time that permits access to a physical page after it has been released back to the page allocator and reused. This is fixed in the following kernel versions: 4.9.135, 4.14.78, 4.18.16, 4.19.
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-1715-1, DLA-1731-1
NVD severitymedium (attack range: local)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
linux (PTS)jessie3.16.56-1+deb8u1vulnerable
jessie (security)3.16.72-1fixed
stretch4.9.168-1fixed
stretch (security)4.9.168-1+deb9u5fixed
buster4.19.37-5fixed
buster (security)4.19.37-5+deb10u2fixed
bullseye4.19.37-6fixed
sid5.2.9-2fixed
linux-4.9 (PTS)jessie (security)4.9.168-1+deb9u5~deb8u1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
linuxsource(unstable)4.18.20-1medium
linuxsourcejessie3.16.64-1mediumDLA-1731-1
linuxsourcestretch4.9.135-1medium
linux-4.9sourcejessie4.9.144-3.1~deb8u1mediumDLA-1715-1

Notes

https://git.kernel.org/linus/eb66ae030829605d61fbef1909ce310e29f78821

Search for package or bug name: Reporting problems