Scientific Linux Security Update : qemu-kvm on SL7.x x86_64 (Spectre)
Medium Nessus Plugin ID 110720
SynopsisThe remote Scientific Linux host is missing one or more security updates.
DescriptionSecurity Fix(es) :
- An industry-wide issue was found in the way many modern microprocessor designs have implemented speculative execution of Load & Store instructions (a commonly used performance optimization). It relies on the presence of a precisely-defined instruction sequence in the privileged code as well as the fact that memory read from address to which a recent memory write has occurred may see an older value and subsequently cause an update into the microprocessor's data cache even for speculatively executed instructions that never actually commit (retire). As a result, an unprivileged attacker could use this flaw to read privileged memory by conducting targeted cache side-channel attacks.
Note: This is the qemu-kvm side of the CVE-2018-3639 mitigation that includes support for guests running on hosts with AMD processors.
SolutionUpdate the affected packages.