CVE-2018-20856

NameCVE-2018-20856
DescriptionAn issue was discovered in the Linux kernel before 4.18.7. In block/blk-core.c, there is an __blk_drain_queue() use-after-free because a certain error case is mishandled.
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-1885-1, DSA-4497-1
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+deb8u1fixed
jessie (security)3.16.72-1fixed
stretch4.9.189-3fixed
stretch (security)4.9.168-1+deb9u5fixed
buster4.19.67-2fixed
buster (security)4.19.37-5+deb10u2fixed
bullseye, sid5.2.9-2fixed
linux-4.9 (PTS)jessie (security)4.9.189-3~deb8u1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
linuxsource(unstable)4.18.8-1medium
linuxsourcejessie(not affected)
linuxsourcestretch4.9.168-1+deb9u5mediumDSA-4497-1
linux-4.9sourcejessie4.9.168-1+deb9u5~deb8u1mediumDLA-1885-1

Notes

[jessie] - linux <not-affected> (Vulnerability introduced later)
Fixed by: https://git.kernel.org/linus/54648cf1ec2d7f4b6a71767799c45676a138ca24

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