CVE-2019-15031 Information

Description

In the Linux kernel through 5.2.14 on the powerpc platform a local user can read vector registers of other users’ processes via an interrupt. To exploit the venerability a local user starts a transaction (via the hardware transactional memory instruction tbegin) and then accesses vector registers. At some point the vector registers will be corrupted with the values from a different local Linux process because MSR_TM_ACTIVE is misused in arch/powerpc/kernel/process.c.

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L

Reference

http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00064.html http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00066.html http://www.openwall.com/lists/oss-security/2019/09/10/4 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a8318c13e79badb92bc6640704a64cc022a6eb97 https://security.netapp.com/advisory/ntap-20191004-0001/ https://usn.ubuntu.com/4135-1/ https://usn.ubuntu.com/4135-2/

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

LOW

Availability Impact

NONE

Base Score

LOW

Base Severity

4.4