Bug 2134528 (CVE-2022-4129) - CVE-2022-4129 kernel: l2tp: missing lock when clearing sk_user_data can lead to NULL pointer dereference
Summary: CVE-2022-4129 kernel: l2tp: missing lock when clearing sk_user_data can lead ...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2022-4129
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: 2145232 2145233 2145234 2145235 2145237
Blocks: 2121459
TreeView+ depends on / blocked
 
Reported: 2022-10-13 14:41 UTC by Mauro Matteo Cascella
Modified: 2024-02-13 01:11 UTC (History)
34 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in the Linux kernel's Layer 2 Tunneling Protocol (L2TP). A missing lock when clearing sk_user_data can lead to a race condition and NULL pointer dereference. A local user could use this flaw to potentially crash the system causing a denial of service.
Clone Of:
Environment:
Last Closed: 2023-05-16 20:32:47 UTC
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2023:2148 0 None None None 2023-05-09 07:12:10 UTC
Red Hat Product Errata RHSA-2023:2458 0 None None None 2023-05-09 07:51:51 UTC
Red Hat Product Errata RHSA-2023:2736 0 None None None 2023-05-16 08:05:30 UTC
Red Hat Product Errata RHSA-2023:2951 0 None None None 2023-05-16 08:34:19 UTC
Red Hat Product Errata RHSA-2024:0412 0 None None None 2024-01-24 16:42:43 UTC

Description Mauro Matteo Cascella 2022-10-13 14:41:07 UTC 
l2tp fails to grab the lock when modifying the underlying tunnel socket, possibly leading to a NULL pointer dereference and denial of service.

Upstream patch:
https://lore.kernel.org/all/20220823101459.211986-1-jakub@cloudflare.com/t [v3]
https://lore.kernel.org/all/20220815130107.149345-1-jakub@cloudflare.com/t [v2]
https://lore.kernel.org/all/20220810102848.282778-1-jakub@cloudflare.com/t [v1]
Comment 3 Mauro Matteo Cascella 2022-11-23 14:55:52 UTC 
In reply to comment #0:
> l2tp fails to grab the lock when modifying the underlying tunnel socket,
> possibly leading to a NULL pointer dereference and denial of service.
> 
> Upstream patch:
> https://lore.kernel.org/all/20220823101459.211986-1-jakub@cloudflare.com/t [v3]

New version:
https://lore.kernel.org/all/20221114191619.124659-1-jakub@cloudflare.com/t [v4]

Note that the above patch does not entirely solve the issue, see follow up:

https://lore.kernel.org/netdev/20221121085426.21315-1-jakub@cloudflare.com/t [v2]
https://lore.kernel.org/netdev/20221119130317.39158-1-jakub@cloudflare.com/t [v1]
Comment 5 Mauro Matteo Cascella 2022-11-23 15:03:19 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2145237]
Comment 9 errata-xmlrpc 2023-05-09 07:12:07 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2023:2148 https://access.redhat.com/errata/RHSA-2023:2148
Comment 10 errata-xmlrpc 2023-05-09 07:51:48 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2023:2458 https://access.redhat.com/errata/RHSA-2023:2458
Comment 11 errata-xmlrpc 2023-05-16 08:05:27 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2023:2736 https://access.redhat.com/errata/RHSA-2023:2736
Comment 12 errata-xmlrpc 2023-05-16 08:34:17 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2023:2951 https://access.redhat.com/errata/RHSA-2023:2951
Comment 13 Product Security DevOps Team 2023-05-16 20:32:44 UTC 
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2022-4129
Comment 16 errata-xmlrpc 2024-01-24 16:42:40 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.6 Extended Update Support

Via RHSA-2024:0412 https://access.redhat.com/errata/RHSA-2024:0412
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