CVE-2018-15572 Information

Description

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.

CVSS Vector

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

Reference

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=fdf82a7856b32d905c39afc85e34364491e46346 https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.1 https://github.com/torvalds/linux/commit/fdf82a7856b32d905c39afc85e34364491e46346 https://lists.debian.org/debian-lts-announce/2018/10/msg00003.html https://usn.ubuntu.com/3775-1/ https://usn.ubuntu.com/3775-2/ https://usn.ubuntu.com/3776-1/ https://usn.ubuntu.com/3776-2/ https://usn.ubuntu.com/3777-1/ https://usn.ubuntu.com/3777-2/ https://usn.ubuntu.com/3777-3/ https://www.debian.org/security/2018/dsa-4308

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

CHANGED

Integrity Impact

HIGH

Availability Impact

NONE

Base Score

NONE

Base Severity

6.5