CVE-2016-6213

low-risk
Published 2016-12-28

fs/namespace.c in the Linux kernel before 4.9 does not restrict how many mounts may exist in a mount namespace, which allows local users to cause a denial of service (memory consumption and deadlock) via MS_BIND mount system calls, as demonstrated by a loop that triggers exponential growth in the number of mounts.

Do I need to act?

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0.04% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
4
CVSS 4.7/10 Medium
LOCAL / HIGH complexity

Affected Products (1)

Affected Vendors

Linux

References (14)

Patch http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d29216...
Mailing List http://www.openwall.com/lists/oss-security/2016/07/13/8
http://www.securityfocus.com/bid/91754
https://access.redhat.com/errata/RHSA-2017:1842
https://access.redhat.com/errata/RHSA-2017:2077
Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=1356471
Patch https://github.com/torvalds/linux/commit/d29216842a85c7970c536108e093963f0271449...
Patch http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d29216...
Mailing List http://www.openwall.com/lists/oss-security/2016/07/13/8
http://www.securityfocus.com/bid/91754
https://access.redhat.com/errata/RHSA-2017:1842
https://access.redhat.com/errata/RHSA-2017:2077
Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=1356471
Patch https://github.com/torvalds/linux/commit/d29216842a85c7970c536108e093963f0271449...
17
/ 100
low-risk
Severity 12/34 · Low
Exploitability 0/34 · Minimal
Exposure 5/34 · Minimal