Vulnerability Name:

CVE-2015-8952 (CCN-118236)

Assigned:2016-10-04
Published:2016-10-04
Updated:2018-03-16
Summary: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.
CVSS v3 Severity:5.5 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
4.8 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
4.0 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)
3.5 Low (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Low
CVSS v2 Severity:2.1 Low (CVSS v2 Vector: AV:L/AC:L/Au:N/C:N/I:N/A:P)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Partial
2.1 Low (CCN CVSS v2 Vector: AV:L/AC:L/Au:N/C:N/I:N/A:P)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Partial
Vulnerability Type:CWE-19
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2015-8952

Source: CCN
Type: Linux Kernel GIT Repository
ext4: convert to mbcache2

Source: CONFIRM
Type: Patch
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=82939d7999dfc1f1998c4b1c12e2f19edbdff272

Source: CONFIRM
Type: Patch
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=be0726d33cb8f411945884664924bed3cb8c70ee

Source: CONFIRM
Type: Patch
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=f9a61eb4e2471c56a63cd804c7474128138c38ac

Source: MLIST
Type: Third Party Advisory
[oss-security] 20160822 CVE request: Linux kernel mbcache lock contention denial of service.

Source: MLIST
Type: Patch, Third Party Advisory
[oss-security] 20160825 Re: CVE request: Linux kernel mbcache lock contention denial of service.

Source: CONFIRM
Type: Issue Tracking, Third Party Advisory
https://bugzilla.kernel.org/show_bug.cgi?id=107301

Source: CCN
Type: Red Hat Bugzilla – Bug 1360968
(CVE-2015-8952) CVE-2015-8952 kernel: mbcache code subject to softlockup DOS in cache management

Source: CONFIRM
Type: Issue Tracking, Third Party Advisory, VDB Entry
https://bugzilla.redhat.com/show_bug.cgi?id=1360968

Source: XF
Type: UNKNOWN
linux-kernel-cve20158952-dos(118236)

Source: CONFIRM
Type: Vendor Advisory
https://github.com/torvalds/linux/commit/82939d7999dfc1f1998c4b1c12e2f19edbdff272

Source: CONFIRM
Type: Issue Tracking, Patch
https://github.com/torvalds/linux/commit/be0726d33cb8f411945884664924bed3cb8c70ee

Source: CONFIRM
Type: Issue Tracking
https://github.com/torvalds/linux/commit/f9a61eb4e2471c56a63cd804c7474128138c38ac

Source: CONFIRM
Type: Third Party Advisory
https://lwn.net/Articles/668718/

Source: UBUNTU
Type: UNKNOWN
USN-3582-1

Source: UBUNTU
Type: UNKNOWN
USN-3582-2

Source: CCN
Type: WhiteSource Vulnerability Database
CVE-2015-8952

Vulnerable Configuration:Configuration 1:
  • cpe:/o:linux:linux_kernel:*:*:*:*:*:*:*:* (Version <= 4.5.7)

    • Configuration CCN 1:
  • cpe:/o:linux:linux_kernel:4.5.7:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:com.ubuntu.bionic:def:201589520000000
    V
    		CVE-2015-8952 on Ubuntu 18.04 LTS (bionic) - medium.
    2016-10-16
    oval:com.ubuntu.artful:def:20158952000
    V
    		CVE-2015-8952 on Ubuntu 17.10 (artful) - medium.
    2016-10-16
    oval:com.ubuntu.trusty:def:20158952000
    V
    		CVE-2015-8952 on Ubuntu 14.04 LTS (trusty) - medium.
    2016-10-16
    oval:com.ubuntu.xenial:def:201589520000000
    V
    		CVE-2015-8952 on Ubuntu 16.04 LTS (xenial) - medium.
    2016-10-16
    oval:com.ubuntu.bionic:def:20158952000
    V
    		CVE-2015-8952 on Ubuntu 18.04 LTS (bionic) - medium.
    2016-10-16
    oval:com.ubuntu.xenial:def:20158952000
    V
    		CVE-2015-8952 on Ubuntu 16.04 LTS (xenial) - medium.
    2016-10-16
    oval:com.ubuntu.disco:def:201589520000000
    V
    		CVE-2015-8952 on Ubuntu 19.04 (disco) - medium.
    2016-10-16
    oval:com.ubuntu.cosmic:def:20158952000
    V
    		CVE-2015-8952 on Ubuntu 18.10 (cosmic) - medium.
    2016-10-16
    oval:com.ubuntu.cosmic:def:201589520000000
    V
    		CVE-2015-8952 on Ubuntu 18.10 (cosmic) - medium.
    2016-10-16
    oval:com.ubuntu.precise:def:20158952000
    V
    		CVE-2015-8952 on Ubuntu 12.04 LTS (precise) - medium.
    2016-10-16
    BACK
    linux linux kernel *
    linux linux kernel 4.5.7