Vulnerability in Linux Kernel
CVE-2015-4170
Race condition in the ldsem_cmpxchg function in drivers/tty/tty_ldsem.c in the Linux kernel before 3.13-rc4-next-20131218 allows local users to cause a denial of service (ldsem_down_read and ldsem_down_write deadlock) by establishing a new tty thread during shutdown of a previous tty thread.
Vulnerability class: Race Condition
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.0/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.003 (25.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 26th percentile — 25.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Linux Kernel
- Red Hat Enterprise Linux Compute Node Eus — versions 7.1
- Red Hat Enterprise Linux For IBM Z Systems Eus — versions 7.1_s390x
- Red Hat Enterprise Linux For Power Big Endian Eus — versions 7.1_ppc64
- Red Hat Enterprise Linux For Power Little Endian Eus — versions 7.1_ppc64le
- Red Hat Enterprise Linux Server Eus — versions 7.1
Weakness classification (CWE)
References
- bugzilla.redhat.com/show_bug.cgi (VDB Entry, Issue Tracking)
- git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/ (Vendor Advisory)
- www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
- github.com/torvalds/linux/commit/cf872776fc84128bb779ce2b83a37c884c3203ae
- www.openwall.com/lists/oss-security/2015/05/26/1 (mailing-list)
- www.kernel.org/pub/linux/kernel/next/patch-v3.13-rc4-next-20131218.xz (Patch)
- access.redhat.com/errata/RHSA-2016:1395 (vendor-advisory, Third Party Advisory)
- www.securityfocus.com/bid/74820 (vdb-entry)
Frequently asked questions
- What is CVE-2015-4170?
- CVE-2015-4170 is a medium-severity vulnerability in Linux Kernel, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 4.7/10. Published 2016-05-02.
- How severe is CVE-2015-4170?
- Medium severity. CVSS v3 base score is 4.7 out of 10.