The spectrev2select_mitigation function in arch/x86/kernel/cpu/bugs.c in the Linux kernel before 4.18.1 does not always fill RSB upon a context switch, which makes it easier for attackers to conduct userspace-userspace spectreRSB attacks.
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"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2018-15572.json"