Bug 2173973 (CVE-2023-1095) - CVE-2023-1095 kernel: netfilter: NULL pointer dereference in nf_tables due to zeroed list head
Summary: CVE-2023-1095 kernel: netfilter: NULL pointer dereference in nf_tables due to...
Keywords:
Status: NEW
Alias: CVE-2023-1095
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: 2072549 2121393 2134371 2173999 2174000 2174001 2174002
Blocks: 2154244
TreeView+ depends on / blocked
 
Reported: 2023-02-28 14:55 UTC by Mauro Matteo Cascella
Modified: 2023-11-08 10:57 UTC (History)
36 users (show)

Fixed In Version: kernel 6.0-rc1
Doc Type: If docs needed, set a value
Doc Text:
A NULL pointer dereference flaw was found in the Linux kernel’s netfilter subsystem. The issue could occur due to an error in nf_tables_updtable while freeing a transaction object not placed on the list head. This flaw allows a local, unprivileged user to crash the system, resulting in a denial of service.
Clone Of:
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Last Closed:
Embargoed:

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Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2023:6037 0 None None None 2023-10-23 16:18:13 UTC
Red Hat Product Errata RHSA-2023:5627 0 None None None 2023-10-10 16:26:15 UTC
Red Hat Product Errata RHSA-2023:5628 0 None None None 2023-10-10 16:24:12 UTC
Red Hat Product Errata RHSA-2023:6813 0 None None None 2023-11-08 10:57:14 UTC

Description Mauro Matteo Cascella 2023-02-28 14:55:06 UTC 
In nf_tables_updtable, if nf_tables_table_enable returns an error, nft_trans_destroy is called to free the transaction object. nft_trans_destroy() calls list_del(), but the transaction was never placed on a list -- the list head is all zeroes, this results in a NULL pointer dereference.

Upstream patch & commit:
https://lore.kernel.org/netfilter-devel/20220809163402.20227-1-fw@strlen.de/
https://github.com/torvalds/linux/commit/580077855a40741cf511766129702d97ff02f4d9
Comment 4 Mauro Matteo Cascella 2023-02-28 16:36:29 UTC 
This issue was fixed upstream in version 6.0. The kernel packages as shipped in Red Hat Enterprise Linux 8 and 9 were previously updated to a version that contains the fix via the following errata:

kernel in Red Hat Enterprise Linux 8
https://access.redhat.com/errata/RHSA-2023:2951

kernel-rt in Red Hat Enterprise Linux 8
https://access.redhat.com/errata/RHSA-2023:2736

kernel in Red Hat Enterprise Linux 9
https://access.redhat.com/errata/RHSA-2022:8267

kernel-rt in Red Hat Enterprise Linux 9
https://access.redhat.com/errata/RHSA-2022:7933
Comment 10 errata-xmlrpc 2023-10-10 16:24:09 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.4 Telecommunications Update Service

Via RHSA-2023:5628 https://access.redhat.com/errata/RHSA-2023:5628
Comment 11 errata-xmlrpc 2023-10-10 16:26:13 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.6 Extended Update Support

Via RHSA-2023:5627 https://access.redhat.com/errata/RHSA-2023:5627
Comment 13 errata-xmlrpc 2023-11-08 10:57:11 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.1 Update Services for SAP Solutions

Via RHSA-2023:6813 https://access.redhat.com/errata/RHSA-2023:6813
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