Bug 1961300 (CVE-2021-33033) - CVE-2021-33033 kernel: use-after-free in cipso_v4_genopt in net/ipv4/cipso_ipv4.c
Summary: CVE-2021-33033 kernel: use-after-free in cipso_v4_genopt in net/ipv4/cipso_ip...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2021-33033
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: 1966980 1961301 1967720 1967721 1967722 1967723 1967724 1967725
Blocks: 1961302
TreeView+ depends on / blocked
 
Reported: 2021-05-17 16:31 UTC by Guilherme de Almeida Suckevicz
Modified: 2022-05-17 10:27 UTC (History)
47 users (show)

Fixed In Version: Kernel 5.12
Clone Of:
Environment:
Last Closed: 2021-07-21 03:54:44 UTC
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2021:2897 0 None None None 2021-07-26 16:58:58 UTC
Red Hat Product Errata RHSA-2021:2725 0 None None None 2021-07-21 01:07:49 UTC
Red Hat Product Errata RHSA-2021:2726 0 None None None 2021-07-21 01:08:23 UTC

Description Guilherme de Almeida Suckevicz 2021-05-17 16:31:57 UTC 
The Linux kernel before 5.11.14 has a use-after-free in cipso_v4_genopt in net/ipv4/cipso_ipv4.c because the CIPSO and CALIPSO refcounting for the DOI definitions is mishandled. This leads to writing an arbitrary value.

References:
https://sites.google.com/view/syzscope/kasan-use-after-free-read-in-cipso_v4_genopt
https://syzkaller.appspot.com/bug?id=96e7d345748d8814901c91cd92084ed04b46701e

Upstream patches:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ad5d07f4a9cd671233ae20983848874731102c08
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1165affd484889d4986cf3b724318935a0b120d8
Comment 1 Guilherme de Almeida Suckevicz 2021-05-17 16:32:34 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1961301]
Comment 2 Justin M. Forbes 2021-05-17 20:31:42 UTC 
This was fixed for Fedora users with the 5.11.14 stable kernel updates.
Comment 28 errata-xmlrpc 2021-07-21 01:07:49 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2021:2725 https://access.redhat.com/errata/RHSA-2021:2725
Comment 29 errata-xmlrpc 2021-07-21 01:08:23 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2021:2726 https://access.redhat.com/errata/RHSA-2021:2726
Comment 30 Product Security DevOps Team 2021-07-21 03:54:44 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-2021-33033
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