CVE-2015-8844

kernel: incorrect restoration of machine specific registers from userspace

Severity Score

5.5

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

The signal implementation in the Linux kernel before 4.3.5 on powerpc platforms does not check for an MSR with both the S and T bits set, which allows local users to cause a denial of service (TM Bad Thing exception and panic) via a crafted application.

La implementación de signal en el Kernel de Linux en versiones anteriores a 4.3.5 sobre plataformas powerpc no verifica que exista un MSR con los bits S y T establecidos, lo que permite a usuarios locales provocar una denegación de servicio (excepción TM Bad Thing exception y pánico) a través de una aplicación manipulada.

A flaw was found in the Linux kernel which could cause a kernel panic when restoring machine specific registers on the PowerPC platform. Incorrect transactional memory state registers could inadvertently change the call path on return from userspace and cause the kernel to enter an unknown state and crash.

*Credits: N/A

CVSS Scores

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Local

Attack Complexity

Medium

Authentication

None

Confidentiality

None

Integrity

None

Availability

Complete

Attack Vector

Local

Attack Complexity

Medium

Authentication

Single

Confidentiality

None

Integrity

None

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2016-04-13 CVE Reserved
2016-04-27 CVE Published
2023-12-14 EPSS Updated
2024-08-06 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-20: Improper Input Validation
CWE-772: Missing Release of Resource after Effective Lifetime

CAPEC

References (9)

URL	Tag	Source
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.3.5	X_refsource_confirm
http://www.openwall.com/lists/oss-security/2016/04/13/1	Mailing List
http://www.securitytracker.com/id/1035594	Vdb Entry
https://github.com/torvalds/linux/commit/d2b9d2a5ad5ef04ff978c9923d19730cb05efd55	X_refsource_confirm

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d2b9d2a5ad5ef04ff978c9923d19730cb05efd55	2018-01-05
http://rhn.redhat.com/errata/RHSA-2016-2574.html	2018-01-05
http://rhn.redhat.com/errata/RHSA-2016-2584.html	2018-01-05
https://bugzilla.redhat.com/show_bug.cgi?id=1326540	2016-11-03
https://access.redhat.com/security/cve/CVE-2015-8844	2016-11-03

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				<= 4.3.4 Search vendor "Linux" for product "Linux Kernel" and version " <= 4.3.4"		-		Affected