Bug 1905658 (CVE-2020-29568) - CVE-2020-29568 xen: frontends can trigger OOM in backends by update a watched path (XSA-349)
Summary: CVE-2020-29568 xen: frontends can trigger OOM in backends by update a watched...
Keywords:
Status: CLOSED UPSTREAM
Alias: CVE-2020-29568
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: 1908084
Blocks: 1903644
TreeView+ depends on / blocked
 
Reported: 2020-12-08 18:47 UTC by Guilherme de Almeida Suckevicz
Modified: 2021-03-04 22:01 UTC (History)
4 users (show)

Fixed In Version:
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Last Closed: 2020-12-15 22:20:01 UTC


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Description Guilherme de Almeida Suckevicz 2020-12-08 18:47:29 UTC
Some OSes (such as Linux, FreeBSD, NetBSD) are processing watch events
using a single thread.  If the events are received faster than the thread
is able to handle, they will get queued.

As the queue is unbound, a guest may be able to trigger a OOM in
the backend.

Comment 1 Guilherme de Almeida Suckevicz 2020-12-15 19:55:40 UTC
External References:

https://www.openwall.com/lists/oss-security/2020/12/15/10

Comment 2 Guilherme de Almeida Suckevicz 2020-12-15 19:55:52 UTC
Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1908084]

Comment 3 Product Security DevOps Team 2020-12-15 22:20:01 UTC
This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.

Comment 4 Justin M. Forbes 2021-03-04 22:01:22 UTC
This was fixed for Fedora with the 5.10.4 stable kernel updates.


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