CVE-2019-14821

NameCVE-2019-14821
DescriptionAn out-of-bounds access issue was found in the Linux kernel, all versions through 5.3, in the way Linux kernel's KVM hypervisor implements the Coalesced MMIO write operation. It operates on an MMIO ring buffer 'struct kvm_coalesced_mmio' object, wherein write indices 'ring->first' and 'ring->last' value could be supplied by a host user-space process. An unprivileged host user or process with access to '/dev/kvm' device could use this flaw to crash the host kernel, resulting in a denial of service or potentially escalating privileges on the system.
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-1930-1, DLA-1940-1, DSA-4531-1
NVD severityhigh (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)3.16.74-1fixed
stretch4.9.189-3vulnerable
stretch (security)4.9.189-3+deb9u1fixed
buster4.19.67-2vulnerable
buster (security)4.19.67-2+deb10u1fixed
bullseye, sid5.2.17-1fixed
linux-4.9 (PTS)jessie (security)4.9.189-3+deb9u1~deb8u1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
linuxsource(unstable)5.2.17-1high
linuxsourcebuster4.19.67-2+deb10u1highDSA-4531-1
linuxsourcejessie3.16.74-1highDLA-1930-1
linuxsourcestretch4.9.189-3+deb9u1highDSA-4531-1
linux-4.9sourcejessie4.9.189-3+deb9u1~deb8u1highDLA-1940-1

Notes

https://git.kernel.org/linus/b60fe990c6b07ef6d4df67bc0530c7c90a62623a

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