PT-2019-4896 · Linux+5 · Linux Kernel+5
Published
2019-09-04
·
Updated
2024-06-15
·
CVE-2019-15031
CVSS v3.1
4.4
Medium
| Vector | AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L |
Name of the Vulnerable Software and Affected Versions
Linux kernel versions prior to 5.2.14 on the powerpc platform
Description
The issue is related to a lack of protection for service data in the arch/powerpc/kernel/process.c component of the Linux kernel, specifically on the powerpc platform. This can be exploited by a local user to impact the confidentiality and availability of protected information. The exploitation involves starting a transaction using the
tbegin command and then accessing vector registers. At some point, the vector registers will be corrupted with values from a different local Linux process due to the misuse of MSR TM ACTIVE in arch/powerpc/kernel/process.c. A local user can read vector registers of other users' processes via an interrupt.Recommendations
For Linux kernel versions prior to 5.2.14 on the powerpc platform:
As a temporary workaround, consider disabling the use of the
tbegin command to prevent exploitation until a patch is available.
Restrict access to vector registers to minimize the risk of exploitation.
Avoid using the MSR TM ACTIVE in the arch/powerpc/kernel/process.c component until the issue is resolved.Exploit
Fix
Information Disclosure
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Related Identifiers
Affected Products
Alt Linux
Centos
Linux Kernel
Red Hat
Suse
Ubuntu