Incomplete RSB Filling in Linux Kernel Allows Userspace-Userspace SpectreRSB Attacks

CVE-2018-15572 · LOW Severity

AV:L/AC:L/AU:N/C:P/I:N/A:N

The spectre_v2_select_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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