Bug 2112693 (CVE-2020-36558) - CVE-2020-36558 kernel: race condition in VT_RESIZEX ioctl when vc_cons[i].d is already NULL leading to NULL pointer dereference [NEEDINFO]
Summary: CVE-2020-36558 kernel: race condition in VT_RESIZEX ioctl when vc_cons[i].d i...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2020-36558
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: 2112697 2233515 2068338 2112694 2112695 2112696
Blocks: 2109700
TreeView+ depends on / blocked
 
Reported: 2022-07-31 17:29 UTC by Alex
Modified: 2023-08-22 16:47 UTC (History)
51 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
A NULL pointer dereference flaw was found in the Linux kernel’s Virtual Terminal subsystem was found in how a user calls the VT_RESIZEX ioctl. This flaw allows a local user to crash the system.
Clone Of:
Environment:
Last Closed: 2022-12-04 05:04:02 UTC
Embargoed:
bhu: needinfo? (mrehak)

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2022:7444 0 None None None 2022-11-08 09:10:25 UTC
Red Hat Product Errata RHSA-2022:7683 0 None None None 2022-11-08 10:10:01 UTC

Description Alex 2022-07-31 17:29:56 UTC 
A NULL pointer dereference vulnerability was found in drivers/tty/vt/vt_ioctl.c in the Linux kernel before 5.5.7.
A race condition when call to VT_RESIZEX ioctl and vc_cons[i].d is already NULL could lead to crash.

Reference:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6cd1ed50efd88261298577cd92a14f2768eddeeb
Comment 3 errata-xmlrpc 2022-11-08 09:10:23 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2022:7444 https://access.redhat.com/errata/RHSA-2022:7444
Comment 4 errata-xmlrpc 2022-11-08 10:09:58 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2022:7683 https://access.redhat.com/errata/RHSA-2022:7683
Comment 5 Product Security DevOps Team 2022-12-04 05:03:58 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-2020-36558
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