CVE-2018-1087

NameCVE-2018-1087
Descriptionkernel KVM before versions kernel 4.16, kernel 4.16-rc7, kernel 4.17-rc1, kernel 4.17-rc2 and kernel 4.17-rc3 is vulnerable to a flaw in the way the Linux kernel's KVM hypervisor handled exceptions delivered after a stack switch operation via Mov SS or Pop SS instructions. During the stack switch operation, the processor did not deliver interrupts and exceptions, rather they are delivered once the first instruction after the stack switch is executed. An unprivileged KVM guest user could use this flaw to crash the guest or, potentially, escalate their privileges in the guest.
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)
ReferencesDSA-4196-1
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)3.16.59-1fixed
stretch4.9.130-2fixed
stretch (security)4.9.110-3+deb9u6fixed
buster, sid4.18.20-2fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
linuxsource(unstable)4.15.17-1medium
linuxsourcejessie3.16.56-1+deb8u1mediumDSA-4196-1
linuxsourcestretch4.9.88-1+deb9u1mediumDSA-4196-1
linuxsourcewheezy(not affected)

Notes

[wheezy] - linux <not-affected> (Issue introduced in 3.16)
Fixed by: https://git.kernel.org/linus/32d43cd391bacb5f0814c2624399a5dad3501d09 (4.16-rc7)
http://www.openwall.com/lists/oss-security/2018/05/08/5

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