CVE-2015-8952
Summary
| CVE | CVE-2015-8952 |
|---|---|
| State | PUBLISHED |
| Assigner | mitre |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2016-10-16 21:59:01 UTC |
| Updated | 2026-05-06 22:30:45 UTC |
| Description | 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. |
Risk And Classification
Primary CVSS: v3.0 5.5 MEDIUM from [email protected]
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS: 0.000770000 probability, percentile 0.228640000 (date 2026-05-07)
Problem Types: CWE-19 | n/a
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.0 | [email protected] | Primary | 5.5 | MEDIUM | CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
| 2.0 | [email protected] | Primary | 2.1 | AV:L/AC:L/Au:N/C:N/I:N/A:P |
CVSS v3.0 Breakdown
Attack Vector
LocalAttack Complexity
LowPrivileges Required
LowUser Interaction
NoneScope
UnchangedConfidentiality
NoneIntegrity
NoneAvailability
HighCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS v2.0 Breakdown
Access Vector
LocalAccess Complexity
LowAuthentication
NoneConfidentiality
NoneIntegrity
NoneAvailability
PartialAV:L/AC:L/Au:N/C:N/I:N/A:P
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Operating System | Linux | Linux Kernel | All | All | All | All |
Vendor Declared Affected Products
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| kernel/git/torvalds/linux.git - Linux kernel source tree | af854a3a-2127-422b-91ae-364da2661108 | git.kernel.org | Patch |
| 107301 – system hang during ext4 xattr operation | af854a3a-2127-422b-91ae-364da2661108 | bugzilla.kernel.org | Issue Tracking, Third Party Advisory |
| USN-3582-2: Linux kernel (Xenial HWE) vulnerabilities | Ubuntu security notices | af854a3a-2127-422b-91ae-364da2661108 | usn.ubuntu.com | |
| ext4: convert to mbcache2 · torvalds/linux@82939d7 · GitHub | af854a3a-2127-422b-91ae-364da2661108 | github.com | Vendor Advisory |
| oss-security - Re: CVE request: Linux kernel mbcache lock contention denial of service. | af854a3a-2127-422b-91ae-364da2661108 | www.openwall.com | Patch, Third Party Advisory |
| oss-security - CVE request: Linux kernel mbcache lock contention denial of service. | af854a3a-2127-422b-91ae-364da2661108 | www.openwall.com | Third Party Advisory |
| kernel/git/torvalds/linux.git - Linux kernel source tree | af854a3a-2127-422b-91ae-364da2661108 | git.kernel.org | Patch |
| mbcache2: reimplement mbcache · torvalds/linux@f9a61eb · GitHub | af854a3a-2127-422b-91ae-364da2661108 | github.com | Issue Tracking |
| kernel/git/torvalds/linux.git - Linux kernel source tree | af854a3a-2127-422b-91ae-364da2661108 | git.kernel.org | Patch |
| ext2: convert to mbcache2 · torvalds/linux@be0726d · GitHub | af854a3a-2127-422b-91ae-364da2661108 | github.com | Issue Tracking, Patch |
| Bug 1360968 – CVE-2015-8952 kernel: mbcache code subject to softlockup DOS in cache management | af854a3a-2127-422b-91ae-364da2661108 | bugzilla.redhat.com | Issue Tracking, Third Party Advisory, VDB Entry |
| USN-3582-1: Linux kernel vulnerabilities | Ubuntu security notices | af854a3a-2127-422b-91ae-364da2661108 | usn.ubuntu.com | |
| ext[24]: MBCache rewrite [LWN.net] | af854a3a-2127-422b-91ae-364da2661108 | lwn.net | Third Party Advisory |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.