Bug 1291197 (CVE-2015-7550) - CVE-2015-7550 kernel: User triggerable crash from race between key read and rey revoke
Summary: CVE-2015-7550 kernel: User triggerable crash from race between key read and r...
Keywords:
Status: CLOSED WONTFIX
Alias: CVE-2015-7550
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: impact=moderate,public=20151210,repor...
Depends On: 1290370 1291198 1293401 1293402
Blocks: 1291199
TreeView+ depends on / blocked
 
Reported: 2015-12-14 09:33 UTC by Adam Mariš
Modified: 2019-06-11 11:13 UTC (History)
34 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
A NULL-pointer dereference flaw was found in the kernel, which is caused by a race between revoking a user-type key and reading from it. The issue could be triggered by an unprivileged user with a local account, causing the kernel to crash (denial of service).
Clone Of:
Environment:
Last Closed: 2019-06-08 02:46:23 UTC


Attachments (Terms of Use)

Description Adam Mariš 2015-12-14 09:33:45 UTC
A race between revoking a user-type key and reading from it was found causing a null pointer dereference and the kernel to crash. This condition can be triggered by unprivileged user with a local account.


Proposed patch:

https://bugzilla.redhat.com/attachment.cgi?id=1104753&action=diff
http://marc.info/?l=linux-kernel&m=145040247605360

Comment 1 Adam Mariš 2015-12-14 09:34:24 UTC
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1291198]

Comment 2 Adam Mariš 2015-12-14 09:41:50 UTC
Acknowledgments:

Red Hat would like to thank Dmitry Vyukov of Google for reporting this issue.

Comment 5 Fedora Update System 2015-12-22 07:20:36 UTC
kernel-4.2.8-200.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.

Comment 6 Fedora Update System 2015-12-22 22:01:49 UTC
kernel-4.2.8-300.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.

Comment 7 Wade Mealing 2016-01-18 02:30:38 UTC
Statement:

This issue affects the Linux kernels as shipped with Red Hat Enterprise Linux 5,6 and 7 and may be addressed in a future update.


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