Bug 2213139 (CVE-2023-31084) - CVE-2023-31084 kernel: blocking operation in dvb_frontend_get_event and wait_event_interruptible
Summary: CVE-2023-31084 kernel: blocking operation in dvb_frontend_get_event and wait_...
Keywords:
Status: NEW
Alias: CVE-2023-31084
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Nobody
QA Contact:
URL:
Whiteboard:
Depends On: 2213140 2213141 2213142 2213143 2213144
Blocks: 2189448
TreeView+ depends on / blocked
 
Reported: 2023-06-07 08:25 UTC by Alex
Modified: 2024-03-19 17:27 UTC (History)
45 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
A potential deadlock flaw was found in the Linux’s kernel DVB API (used by Digital TV devices) functionality. This flaw allows a local user to crash the system.
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2023:7268 0 None None None 2023-11-15 18:24:51 UTC
Red Hat Product Errata RHBA-2023:7328 0 None None None 2023-11-16 11:39:02 UTC
Red Hat Product Errata RHBA-2023:7338 0 None None None 2023-11-16 18:04:23 UTC
Red Hat Product Errata RHBA-2023:7343 0 None None None 2023-11-20 01:58:53 UTC
Red Hat Product Errata RHBA-2023:7346 0 None None None 2023-11-20 09:25:53 UTC
Red Hat Product Errata RHSA-2023:6901 0 None None None 2023-11-14 15:15:36 UTC
Red Hat Product Errata RHSA-2023:7077 0 None None None 2023-11-14 15:20:58 UTC
Red Hat Product Errata RHSA-2024:0930 0 None None None 2024-02-21 00:27:35 UTC
Red Hat Product Errata RHSA-2024:1404 0 None None None 2024-03-19 17:27:23 UTC

Description Alex 2023-06-07 08:25:28 UTC 
A flaw in the Linux Kernel found in drivers/media/dvb-core/dvb_frontend.c. There is a blocking operation when a task is in !TASK_RUNNING. In dvb_frontend_get_event, wait_event_interruptible is called; the condition is dvb_frontend_test_event(fepriv,events). In dvb_frontend_test_event, down(&fepriv->sem) is called. However, wait_event_interruptible would put the process to sleep, and down(&fepriv->sem) may block the process.

Reference:
https://lore.kernel.org/all/CA+UBctCu7fXn4q41O_3=id1+OdyQ85tZY1x+TkT-6OVBL6KAUw@mail.gmail.com/
Comment 1 Alex 2023-06-07 08:25:54 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2213140]
Comment 6 errata-xmlrpc 2023-11-14 15:15:33 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2023:6901 https://access.redhat.com/errata/RHSA-2023:6901
Comment 7 errata-xmlrpc 2023-11-14 15:20:55 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2023:7077 https://access.redhat.com/errata/RHSA-2023:7077
Comment 10 errata-xmlrpc 2024-02-21 00:27:32 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.6 Extended Update Support

Via RHSA-2024:0930 https://access.redhat.com/errata/RHSA-2024:0930
Comment 13 errata-xmlrpc 2024-03-19 17:27:20 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.8 Extended Update Support

Via RHSA-2024:1404 https://access.redhat.com/errata/RHSA-2024:1404
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