Vulnerability Details : CVE-2015-8952
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.
Vulnerability category: Denial of service
Products affected by CVE-2015-8952
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2015-8952
0.08%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 20 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2015-8952
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
2.1
|
LOW | AV:L/AC:L/Au:N/C:N/I:N/A:P |
3.9
|
2.9
|
NIST | |
|
5.5
|
MEDIUM | CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
1.8
|
3.6
|
NIST |
CWE ids for CVE-2015-8952
-
Assigned by: nvd@nist.gov (Primary)
References for CVE-2015-8952
-
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=82939d7999dfc1f1998c4b1c12e2f19edbdff272
kernel/git/torvalds/linux.git - Linux kernel source treePatch
-
http://www.openwall.com/lists/oss-security/2016/08/25/4
oss-security - Re: CVE request: Linux kernel mbcache lock contention denial of service.Patch;Third Party Advisory
-
https://lwn.net/Articles/668718/
ext[24]: MBCache rewrite [LWN.net]Third Party Advisory
-
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=be0726d33cb8f411945884664924bed3cb8c70ee
kernel/git/torvalds/linux.git - Linux kernel source treePatch
-
http://www.openwall.com/lists/oss-security/2016/08/22/2
oss-security - CVE request: Linux kernel mbcache lock contention denial of service.Third Party Advisory
-
https://github.com/torvalds/linux/commit/f9a61eb4e2471c56a63cd804c7474128138c38ac
mbcache2: reimplement mbcache · torvalds/linux@f9a61eb · GitHubIssue Tracking
-
https://github.com/torvalds/linux/commit/82939d7999dfc1f1998c4b1c12e2f19edbdff272
ext4: convert to mbcache2 · torvalds/linux@82939d7 · GitHubVendor Advisory
-
https://usn.ubuntu.com/3582-2/
USN-3582-2: Linux kernel (Xenial HWE) vulnerabilities | Ubuntu security notices
-
https://bugzilla.kernel.org/show_bug.cgi?id=107301
107301 – system hang during ext4 xattr operationIssue Tracking;Third Party Advisory
-
https://github.com/torvalds/linux/commit/be0726d33cb8f411945884664924bed3cb8c70ee
ext2: convert to mbcache2 · torvalds/linux@be0726d · GitHubIssue Tracking;Patch
-
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=f9a61eb4e2471c56a63cd804c7474128138c38ac
kernel/git/torvalds/linux.git - Linux kernel source treePatch
-
https://usn.ubuntu.com/3582-1/
USN-3582-1: Linux kernel vulnerabilities | Ubuntu security notices
-
https://bugzilla.redhat.com/show_bug.cgi?id=1360968
1360968 – (CVE-2015-8952) CVE-2015-8952 kernel: mbcache code subject to softlockup DOS in cache managementIssue Tracking;Third Party Advisory;VDB Entry
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