Bug 2186862 (CVE-2023-2008, ZDI-23-441, ZDI-CAN-17639) - CVE-2023-2008 kernel: udmabuf: improper validation of array index leading to local privilege escalation
Summary: CVE-2023-2008 kernel: udmabuf: improper validation of array index leading to ...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2023-2008, ZDI-23-441, ZDI-CAN-17639
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2186863 2186864 2186865
Blocks: 2186277
TreeView+ depends on / blocked
 
Reported: 2023-04-14 16:41 UTC by Mauro Matteo Cascella
Modified: 2023-06-06 21:29 UTC (History)
47 users (show)

Fixed In Version: kernel 5.19-rc4
Clone Of:
Environment:
Last Closed: 2023-06-06 21:29:46 UTC
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2023:3465 0 None None None 2023-06-06 08:46:43 UTC
Red Hat Product Errata RHSA-2023:3470 0 None None None 2023-06-06 08:45:49 UTC
Red Hat Product Errata RHSA-2023:3490 0 None None None 2023-06-06 13:37:36 UTC

Description Mauro Matteo Cascella 2023-04-14 16:41:11 UTC 
A flaw was found in udmabuf. udmabuf is a linux device driver for user space mappable DMA buffer. Quoting ZDI security advisory [1]:

"This vulnerability allows local attackers to escalate privileges on affected installations of Linux Kernel. An attacker must first obtain the ability to execute high-privileged code on the target system in order to exploit this vulnerability.

The specific flaw exists within a fault handler. The issue results from the lack of proper validation of user-supplied data, which can result in a memory access past the end of an array. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of the kernel."

[1] https://www.zerodayinitiative.com/advisories/ZDI-23-441/
Comment 4 Mauro Matteo Cascella 2023-04-14 17:10:38 UTC 
Upstream commit:
https://github.com/torvalds/linux/commit/05b252cccb2e5c3f56119d25de684b4f810ba4
Comment 5 Mauro Matteo Cascella 2023-04-14 17:15:23 UTC 
This issue was fixed upstream in version 5.19. The kernel packages as shipped in Red Hat Enterprise Linux 9 were previously updated to a version that contains the fix via the following errata:

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 6 errata-xmlrpc 2023-06-06 08:45:46 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.0 Extended Update Support

Via RHSA-2023:3470 https://access.redhat.com/errata/RHSA-2023:3470
Comment 7 errata-xmlrpc 2023-06-06 08:46:39 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.0 Extended Update Support

Via RHSA-2023:3465 https://access.redhat.com/errata/RHSA-2023:3465
Comment 8 errata-xmlrpc 2023-06-06 13:37:32 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.0 Extended Update Support

Via RHSA-2023:3490 https://access.redhat.com/errata/RHSA-2023:3490
Comment 9 Product Security DevOps Team 2023-06-06 21:29:43 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-2023-2008
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