CVE-2015-8952

Ubuntu Security Notice USN-3582-2

Severity Score

5.5

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

The mbcache feature in the ext2 and ext4 filesystem implementations in the Linux kernel before 4.6 mishandles xattr block caching, which allows local users to cause a denial of service (soft lockup) via filesystem operations in environments that use many attributes, as demonstrated by Ceph and Samba.

La funcionalidad mbcache en las implementaciones del sistema de archivos ext2 y ext4 en el kernel de Linux en versiones anteriores a 4.6 no maneja adecuadamente bloque de almacenamiento en caché xattr, lo que permite a usuarios locales provocar una denegación de servicio (bloqueo débil) a través de operaciones de sistema de archivos en entornos que usan muchos atributos, como se demuestra por Ceph y Samba.

USN-3582-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.04 LTS. This update provides the corresponding updates for the Linux Hardware Enablement kernel from Ubuntu 16.04 LTS for Ubuntu 14.04 LTS. Mohamed Ghannam discovered that the IPv4 raw socket implementation in the Linux kernel contained a race condition leading to uninitialized pointer usage. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. Various other issues were also addressed.

*Credits: N/A

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Local

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2016-08-25 CVE Reserved
2016-10-16 CVE Published
2024-08-06 CVE Updated
2025-03-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-19: Data Processing Errors

CAPEC

References (13)

URL	Tag	Source
http://www.openwall.com/lists/oss-security/2016/08/22/2	Mailing List
https://bugzilla.kernel.org/show_bug.cgi?id=107301	Issue Tracking
https://bugzilla.redhat.com/show_bug.cgi?id=1360968	Issue Tracking
https://github.com/torvalds/linux/commit/f9a61eb4e2471c56a63cd804c7474128138c38ac	Issue Tracking
https://lwn.net/Articles/668718	Third Party Advisory

URL	Date	SRC

URL	Date	SRC
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=82939d7999dfc1f1998c4b1c12e2f19edbdff272	2018-03-16
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=be0726d33cb8f411945884664924bed3cb8c70ee	2018-03-16
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=f9a61eb4e2471c56a63cd804c7474128138c38ac	2018-03-16
http://www.openwall.com/lists/oss-security/2016/08/25/4	2018-03-16
https://github.com/torvalds/linux/commit/be0726d33cb8f411945884664924bed3cb8c70ee	2018-03-16

URL	Date	SRC
https://github.com/torvalds/linux/commit/82939d7999dfc1f1998c4b1c12e2f19edbdff272	2018-03-16
https://usn.ubuntu.com/3582-1	2018-03-16
https://usn.ubuntu.com/3582-2	2018-03-16

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"				<= 4.5.7 Search vendor "Linux" for product "Linux Kernel" and version " <= 4.5.7"		-		Affected