CVE-2014-4171
MEDIUM severity · CVSS 4.7
4.7CVSS MEDIUM
Summary
mm/shmem.c in the Linux kernel through 3.15.1 does not properly implement the interaction between range notification and hole punching, which allows local users to cause a denial of service (i_mutex hold) by using the mmap system call to access a hole, as demonstrated by interfering with intended shmem activity by blocking completion of (1) an MADV_REMOVE madvise call or (2) an FALLOC_FL_PUNCH_HOLE fallocate call.
Impact & exploitability
Attack vectorLocal
Attack complexity—
Privileges required—
User interaction—
Confidentiality impactNone
Integrity impactNone
Availability impact—
Exploit probability (EPSS)0%
AV:L/AC:M/Au:N/C:N/I:N/A:C
Affected products we track (1)
Recommendation
Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.
Additional information
- NVD record
- http://lists.opensuse.org/opensuse-security-announce/2014-10/msg00006.htmlAdvisory
- http://lists.opensuse.org/opensuse-security-announce/2014-10/msg00007.htmlAdvisory
- http://marc.info/?l=linux-mm-commits&m=140303745420549&w=2Advisory
- http://ozlabs.org/~akpm/mmots/broken-out/shmem-fix-faulting-into-a-hole-while-its-punched.patchAdvisory
- http://rhn.redhat.com/errata/RHSA-2014-1318.htmlAdvisory
- http://rhn.redhat.com/errata/RHSA-2015-0102.htmlAdvisory
- http://secunia.com/advisories/59777Advisory
- http://secunia.com/advisories/60564Advisory