Bug 1694758 (CVE-2019-9857) - CVE-2019-9857 kernel: memory leak in inotify_update_existing_watch() leads to denial of service
Summary: CVE-2019-9857 kernel: memory leak in inotify_update_existing_watch() leads to...
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2019-9857
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: 1694759 1711174 1711178 1711179
Blocks: 1694762
TreeView+ depends on / blocked
 
Reported: 2019-04-01 15:13 UTC by msiddiqu
Modified: 2021-02-16 22:10 UTC (History)
42 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
A flaw in the inotify subsystem can allow a local attacker to create a denial of service (DOS) situation in which the memory use of watches on existing watchpoints were not accounted for correctly.
Clone Of:
Environment:
Last Closed: 2019-07-31 13:52:14 UTC
Embargoed:

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Description msiddiqu 2019-04-01 15:13:41 UTC 
In the Linux kernel through 5.0.2, the function inotify_update_existing_watch() in fs/notify/inotify/inotify_user.c neglects to call fsnotify_put_mark() with IN_MASK_CREATE after fsnotify_find_mark(), which will cause a memory leak (aka refcount leak). Finally, this will cause a denial of service.

Upstream patch: 
https://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs.git/commit/?h=fsnotify&id=62c9d2674b31d4c8a674bee86b7edc6da2803aea

References:  
https://patchwork.kernel.org/patch/10836283/
Comment 1 msiddiqu 2019-04-01 15:13:58 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1694759]
Comment 2 Fedora Update System 2019-04-09 01:13:29 UTC 
kernel-5.0.6-100.fc28, kernel-headers-5.0.6-100.fc28, kernel-tools-5.0.6-100.fc28 has been pushed to the Fedora 28 stable repository. If problems still persist, please make note of it in this bug report.
Comment 3 Fedora Update System 2019-04-09 02:19:06 UTC 
kernel-5.0.6-200.fc29, kernel-headers-5.0.6-200.fc29, kernel-tools-5.0.6-200.fc29 has been pushed to the Fedora 29 stable repository. If problems still persist, please make note of it in this bug report.
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