Vulnerability Name:

CVE-2015-8953 (CCN-118239)

Assigned:2016-10-16
Published:2016-10-16
Updated:2016-11-28
Summary:fs/overlayfs/copy_up.c in the Linux kernel before 4.2.6 uses an incorrect cleanup code path, which allows local users to cause a denial of service (dentry reference leak) via filesystem operations on a large file in a lower overlayfs layer.
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
5.5 Medium (CCN 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 (CCN 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
CVSS v2 Severity:4.9 Medium (CVSS v2 Vector: AV:L/AC:L/Au:N/C:N/I:N/A:C)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Complete
4.6 Medium (CCN CVSS v2 Vector: AV:L/AC:L/Au:S/C:N/I:N/A:C)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Athentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Complete
Vulnerability Type:CWE-399
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2015-8953

Source: CCN
Type: Linux Kernel GIT Repository
ovl: fix dentry reference leak

Source: CONFIRM
Type: Exploit, Patch, Vendor Advisory
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ab79efab0a0ba01a74df782eb7fa44b044dae8b5

Source: CONFIRM
Type: Release Notes, Vendor Advisory
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.2.6

Source: MLIST
Type: Exploit, Third Party Advisory
[oss-security] 20160823 cve request: overlayfs: Fix dentry reference leak

Source: BID
Type: UNKNOWN
92611

Source: CCN
Type: BID-92611
Linux Kernel 'ovl_copy_up_locked()' Local Denial of Service Vulnerability

Source: CCN
Type: Red Hat Bugzilla – Bug 1367814
(CVE-2015-8953) CVE-2015-8953 kernel: overlayfs: Double dentry reference leak in copy-up failure

Source: CONFIRM
Type: Issue Tracking, Third Party Advisory, VDB Entry
https://bugzilla.redhat.com/show_bug.cgi?id=1367814

Source: XF
Type: UNKNOWN
linux-kernel-cve20158953-dos(118239)

Source: CONFIRM
Type: Patch
https://github.com/torvalds/linux/commit/ab79efab0a0ba01a74df782eb7fa44b044dae8b5

Source: CCN
Type: WhiteSource Vulnerability Database
CVE-2015-8953

Vulnerable Configuration:Configuration 1:
  • cpe:/o:linux:linux_kernel:*:*:*:*:*:*:*:* (Version <= 4.2.5)

    • Configuration CCN 1:
  • cpe:/o:linux:linux_kernel:4.2.5:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:com.ubuntu.precise:def:20158953000
    V
    		CVE-2015-8953 on Ubuntu 12.04 LTS (precise) - medium.
    2016-10-16
    oval:com.ubuntu.trusty:def:20158953000
    V
    		CVE-2015-8953 on Ubuntu 14.04 LTS (trusty) - medium.
    2016-10-16
    oval:com.ubuntu.xenial:def:20158953000
    V
    		CVE-2015-8953 on Ubuntu 16.04 LTS (xenial) - medium.
    2016-10-16
    oval:com.ubuntu.xenial:def:201589530000000
    V
    		CVE-2015-8953 on Ubuntu 16.04 LTS (xenial) - medium.
    2016-10-16
    BACK
    linux linux kernel *
    linux linux kernel 4.2.5