Bug 2237757 (CVE-2023-4623) - CVE-2023-4623 kernel: net/sched: sch_hfsc UAF
Summary: CVE-2023-4623 kernel: net/sched: sch_hfsc UAF
Keywords:
Status: NEW
Alias: CVE-2023-4623
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2249630
Blocks: 2237759
TreeView+ depends on / blocked
 
Reported: 2023-09-06 18:06 UTC by juneau
Modified: 2024-04-30 16:24 UTC (History)
43 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
A use-after-free flaw was found in the Linux kernel's net/sched: sch_hfsc (HFSC qdisc traffic control) component that can be exploited to achieve local privilege escalation. If a class with a link-sharing curve, for example, with the HFSC_FSC flag set, has a parent without a link-sharing curve, then init_vf() will call vttree_insert() on the parent, but vttree_remove() will be skipped in update_vf(). This leaves a dangling pointer that can cause a use-after-free issue.
Clone Of:
Environment:
Last Closed:
Embargoed:
ptalbert: needinfo-

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2024:0610 0 None None None 2024-01-30 14:48:46 UTC
Red Hat Product Errata RHBA-2024:0611 0 None None None 2024-01-30 14:53:11 UTC
Red Hat Product Errata RHBA-2024:0637 0 None None None 2024-02-01 00:09:08 UTC
Red Hat Product Errata RHBA-2024:0673 0 None None None 2024-02-05 10:13:11 UTC
Red Hat Product Errata RHBA-2024:0688 0 None None None 2024-02-05 17:04:14 UTC
Red Hat Product Errata RHBA-2024:2615 0 None None None 2024-04-30 16:24:06 UTC
Red Hat Product Errata RHSA-2024:0340 0 None None None 2024-01-23 09:12:30 UTC
Red Hat Product Errata RHSA-2024:0378 0 None None None 2024-01-23 17:28:19 UTC
Red Hat Product Errata RHSA-2024:0381 0 None None None 2024-01-23 17:50:31 UTC
Red Hat Product Errata RHSA-2024:0386 0 None None None 2024-01-24 09:08:00 UTC
Red Hat Product Errata RHSA-2024:0412 0 None None None 2024-01-24 16:45:06 UTC
Red Hat Product Errata RHSA-2024:0431 0 None None None 2024-01-24 15:24:42 UTC
Red Hat Product Errata RHSA-2024:0432 0 None None None 2024-01-24 15:25:32 UTC
Red Hat Product Errata RHSA-2024:0439 0 None None None 2024-01-24 16:36:25 UTC
Red Hat Product Errata RHSA-2024:0448 0 None None None 2024-01-24 16:38:12 UTC
Red Hat Product Errata RHSA-2024:0461 0 None None None 2024-01-24 16:29:04 UTC
Red Hat Product Errata RHSA-2024:0554 0 None None None 2024-01-30 00:33:58 UTC
Red Hat Product Errata RHSA-2024:0562 0 None None None 2024-01-30 12:28:00 UTC
Red Hat Product Errata RHSA-2024:0563 0 None None None 2024-01-30 12:27:07 UTC
Red Hat Product Errata RHSA-2024:0575 0 None None None 2024-01-30 13:22:12 UTC
Red Hat Product Errata RHSA-2024:0593 0 None None None 2024-01-30 13:10:23 UTC
Red Hat Product Errata RHSA-2024:0876 0 None None None 2024-02-20 04:53:48 UTC
Red Hat Product Errata RHSA-2024:0881 0 None None None 2024-02-20 12:28:33 UTC
Red Hat Product Errata RHSA-2024:0897 0 None None None 2024-02-20 12:33:22 UTC
Red Hat Product Errata RHSA-2024:1268 0 None None None 2024-03-12 11:44:18 UTC
Red Hat Product Errata RHSA-2024:1269 0 None None None 2024-03-12 11:45:28 UTC
Red Hat Product Errata RHSA-2024:1278 0 None None None 2024-03-12 15:00:51 UTC
Red Hat Product Errata RHSA-2024:1746 0 None None None 2024-04-10 08:05:14 UTC
Red Hat Product Errata RHSA-2024:1747 0 None None None 2024-04-10 08:02:59 UTC
Red Hat Product Errata RHSA-2024:1960 0 None None None 2024-04-23 00:42:15 UTC
Red Hat Product Errata RHSA-2024:2003 0 None None None 2024-04-23 15:43:10 UTC
Red Hat Product Errata RHSA-2024:2004 0 None None None 2024-04-23 16:39:02 UTC

Description juneau 2023-09-06 18:06:53 UTC 
A use-after-free vulnerability in the Linux kernel's net/sched: sch_hfsc (HFSC qdisc traffic control) component can be exploited to achieve local privilege escalation.

If a class with a link-sharing curve (i.e. with the HFSC_FSC flag set) has a parent without a link-sharing curve, then init_vf() will call vttree_insert() on the parent, but vttree_remove() will be skipped in update_vf(). This leaves a dangling pointer that can cause a use-after-free.

We recommend upgrading past commit b3d26c5702c7d6c45456326e56d2ccf3f103e60f.

https://kernel.dance/b3d26c5702c7d6c45456326e56d2ccf3f103e60f
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b3d26c5702c7d6c45456326e56d2ccf3f103e60f
Comment 6 Alex 2023-11-14 13:16:10 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2249630]
Comment 14 Justin M. Forbes 2023-11-14 21:56:58 UTC 
This was fixed for Fedora with the 6.5.3 stable kernel updates.
Comment 27 errata-xmlrpc 2024-01-23 09:12:28 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2024:0340 https://access.redhat.com/errata/RHSA-2024:0340
Comment 28 errata-xmlrpc 2024-01-23 17:28:17 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.6 Extended Update Support

Via RHSA-2024:0378 https://access.redhat.com/errata/RHSA-2024:0378
Comment 29 errata-xmlrpc 2024-01-23 17:50:28 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Extended Update Support

Via RHSA-2024:0381 https://access.redhat.com/errata/RHSA-2024:0381
Comment 30 errata-xmlrpc 2024-01-24 09:07:57 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.0 Extended Update Support

Via RHSA-2024:0386 https://access.redhat.com/errata/RHSA-2024:0386
Comment 31 errata-xmlrpc 2024-01-24 15:24:39 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.0 Extended Update Support

Via RHSA-2024:0431 https://access.redhat.com/errata/RHSA-2024:0431
Comment 32 errata-xmlrpc 2024-01-24 15:25:30 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.0 Extended Update Support

Via RHSA-2024:0432 https://access.redhat.com/errata/RHSA-2024:0432
Comment 33 errata-xmlrpc 2024-01-24 16:29:00 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2024:0461 https://access.redhat.com/errata/RHSA-2024:0461
Comment 34 errata-xmlrpc 2024-01-24 16:36:22 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Extended Update Support

Via RHSA-2024:0439 https://access.redhat.com/errata/RHSA-2024:0439
Comment 35 errata-xmlrpc 2024-01-24 16:38:10 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Extended Update Support

Via RHSA-2024:0448 https://access.redhat.com/errata/RHSA-2024:0448
Comment 36 errata-xmlrpc 2024-01-24 16:45:03 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
Comment 37 errata-xmlrpc 2024-01-30 00:33:53 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.8 Extended Update Support

Via RHSA-2024:0554 https://access.redhat.com/errata/RHSA-2024:0554
Comment 38 errata-xmlrpc 2024-01-30 12:27:03 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 Telecommunications Update Service
  Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions

Via RHSA-2024:0563 https://access.redhat.com/errata/RHSA-2024:0563
Comment 39 errata-xmlrpc 2024-01-30 12:27:57 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-2024:0562 https://access.redhat.com/errata/RHSA-2024:0562
Comment 40 errata-xmlrpc 2024-01-30 13:10:19 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions

Via RHSA-2024:0593 https://access.redhat.com/errata/RHSA-2024:0593
Comment 41 errata-xmlrpc 2024-01-30 13:22:08 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.8 Extended Update Support

Via RHSA-2024:0575 https://access.redhat.com/errata/RHSA-2024:0575
Comment 43 errata-xmlrpc 2024-02-20 04:53:44 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2024:0876 https://access.redhat.com/errata/RHSA-2024:0876
Comment 44 errata-xmlrpc 2024-02-20 12:28:30 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2024:0881 https://access.redhat.com/errata/RHSA-2024:0881
Comment 45 errata-xmlrpc 2024-02-20 12:33:18 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2024:0897 https://access.redhat.com/errata/RHSA-2024:0897
Comment 46 errata-xmlrpc 2024-03-12 11:44:14 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.2 Advanced Update Support
  Red Hat Enterprise Linux 8.2 Telecommunications Update Service
  Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions

Via RHSA-2024:1268 https://access.redhat.com/errata/RHSA-2024:1268
Comment 47 errata-xmlrpc 2024-03-12 11:45:23 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.2 Telecommunications Update Service

Via RHSA-2024:1269 https://access.redhat.com/errata/RHSA-2024:1269
Comment 48 errata-xmlrpc 2024-03-12 15:00:48 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions

Via RHSA-2024:1278 https://access.redhat.com/errata/RHSA-2024:1278
Comment 49 errata-xmlrpc 2024-04-10 08:02:56 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7.6 Advanced Update Support

Via RHSA-2024:1747 https://access.redhat.com/errata/RHSA-2024:1747
Comment 50 errata-xmlrpc 2024-04-10 08:05:10 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7.7 Advanced Update Support

Via RHSA-2024:1746 https://access.redhat.com/errata/RHSA-2024:1746
Comment 51 errata-xmlrpc 2024-04-23 00:42:12 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2024:1960 https://access.redhat.com/errata/RHSA-2024:1960
Comment 52 errata-xmlrpc 2024-04-23 15:43:06 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2024:2003 https://access.redhat.com/errata/RHSA-2024:2003
Comment 53 errata-xmlrpc 2024-04-23 16:38:58 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2024:2004 https://access.redhat.com/errata/RHSA-2024:2004
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