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Category:   OS (Linux)  >   Linux Kernel Vendors:   kernel.org
Linux Kernel show_timer() Input Validation Flaw Lets Local Users View Portions of System Memory on the Target System
SecurityTracker Alert ID:  1041414
SecurityTracker URL:  http://securitytracker.com/id/1041414
CVE Reference:   CVE-2017-18344   (Links to External Site)
Date:  Aug 2 2018
Impact:   Disclosure of system information
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in the Linux kernel. A local user can obtain potentially sensitive information from system memory.

A local user can trigger an out-of-bounds memory read error in the 'sigevent->sigev_notify' field of show_timer() function in the timer subsystem to obtain potentially sensitive information from system memory on the target system.

Impact:   A local user can obtain potentially sensitive information from system memory on the target system.
Solution:   The vendor has issued a source code fix [in December 2017], available at:

https://github.com/torvalds/linux/commit/cef31d9af908243421258f1df35a4a644604efbe

Vendor URL:  www.kernel.org/ (Links to External Site)
Cause:   Access control error, Input validation error

Message History:   This archive entry has one or more follow-up message(s) listed below.
Aug 16 2018 (Ubuntu Issues Fix) Linux Kernel show_timer() Input Validation Flaw Lets Local Users View Portions of System Memory on the Target System
Ubuntu has issued a fix for Ubuntu Linux 14.04 LTS.
Sep 11 2018 (Oracle Issues Fix for Oracle Linux) Linux Kernel show_timer() Input Validation Flaw Lets Local Users View Portions of System Memory on the Target System
Oracle has issued a fix for Oracle Linux 6 and 7.
Sep 14 2018 (Oracle Issues Fix for Oracle Linux) Linux Kernel show_timer() Input Validation Flaw Lets Local Users View Portions of System Memory on the Target System
Oracle has issued a fix for Oracle Linux 5 ELS and Oracle Linux 6.
Nov 12 2018 (Red Hat Issues Fix) Linux Kernel show_timer() Input Validation Flaw Lets Local Users View Portions of System Memory on the Target System
Red Hat has issued a fix for Red Hat Enterprise Linux 7.5.
Nov 13 2018 (Red Hat Issues Fix) Linux Kernel show_timer() Input Validation Flaw Lets Local Users View Portions of System Memory on the Target System
Red Hat has issued a fix for Red Hat Enterprise Linux 7.4.
Nov 13 2018 (Red Hat Issues Fix) Linux Kernel show_timer() Input Validation Flaw Lets Local Users View Portions of System Memory on the Target System
Red Hat has issued a fix for Red Hat Enterprise Linux 7.3.
Nov 13 2018 (Red Hat Issues Fix) Linux Kernel show_timer() Input Validation Flaw Lets Local Users View Portions of System Memory on the Target System
Red Hat has issued a fix for Red Hat Enterprise Linux 7.2.
Nov 13 2018 (Red Hat Issues Fix) Linux Kernel show_timer() Input Validation Flaw Lets Local Users View Portions of System Memory on the Target System
Red Hat has issued a fix for Red Hat Enterprise Linux 6.



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