Bug 1705498 (CVE-2019-11486) - CVE-2019-11486 kernel: multiple race conditions in Siemens R3964 line discipline driver in drivers/tty/n_r3964.c leading to denial of service
Summary: CVE-2019-11486 kernel: multiple race conditions in Siemens R3964 line discipl...
Keywords:
Status: CLOSED WONTFIX
Alias: CVE-2019-11486
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1705499
Blocks: 1705500
TreeView+ depends on / blocked
 
Reported: 2019-05-02 12:15 UTC by msiddiqu
Modified: 2021-02-16 21:59 UTC (History)
44 users (show)

Fixed In Version: kernel 5.0.8
Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in the Linux kernel's Siemens r3964 adapter driver. The flaw allows an attacker, with a local account and an ability to open the serial port of a Siemens r3964 adapter, may be able to abuse this race condition for memory corruption and possibly privilege escalation.
Clone Of:
Environment:
Last Closed: 2019-05-31 06:19:46 UTC
Embargoed:

Attachments (Terms of Use)

Description msiddiqu 2019-05-02 12:15:13 UTC 
The Siemens R3964 line discipline driver in drivers/tty/n_r3964.c in the Linux kernel before 5.0.8 has multiple race conditions.

Upstream patch:

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=c7084edc3f6d67750f50d4183134c4fb5712a5c8 
https://github.com/torvalds/linux/commit/c7084edc3f6d67750f50d4183134c4fb5712a5c8

Reference:

https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.0.8
Comment 1 msiddiqu 2019-05-02 12:15:49 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1705499]
Comment 2 Justin M. Forbes 2019-05-02 17:42:03 UTC 
This was fixed for Fedora with the 5.0.8 stable kernel updates.
Comment 4 Wade Mealing 2019-05-31 05:45:02 UTC 
The fix proposed by upstream is not actually fixing the problem, instead they are attempting to mask out the ability to build the code with the buggy implementation. The code with the race condition still exists in the repository, and likely other CVE's may come about if/when this driver gets fixed.
Comment 5 Wade Mealing 2019-05-31 05:52:10 UTC 
Statement:
This task is marked as moderate as there is likely a chance for memory corruption, but this hardware is uncommon, it is unlikely that most systems have this hardware.
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