Bug 1876788 (CVE-2020-14390) - CVE-2020-14390 kernel: out-of-bounds write in fbcon_redraw_softback
Summary: CVE-2020-14390 kernel: out-of-bounds write in fbcon_redraw_softback
Alias: CVE-2020-14390
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
Depends On: 1879955 Red Hat1881438 Red Hat1881439 Red Hat1881440 Red Hat1881441 Red Hat1881442 Red Hat1881446 Red Hat1881447 Red Hat1881448 Red Hat1881449 Red Hat1881450
Blocks: Embargoed1876438
TreeView+ depends on / blocked
Reported: 2020-09-08 07:43 UTC by msiddiqu
Modified: 2021-11-07 11:16 UTC (History)
45 users (show)

Fixed In Version: Linux kernel 5.9-rc6
Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in the Linux kernel. When changing screen size, an out-of-bounds memory write can occur leading to memory corruption or a denial of service. Due to the nature of the flaw, privilege escalation cannot be fully ruled out.
Clone Of:
Last Closed: 2021-11-07 11:16:04 UTC

Attachments (Terms of Use)

Description msiddiqu 2020-09-08 07:43:51 UTC
A vulnerability was found in Linux Kernel where the value of vc->vc_origin is not updated in time while invoking vc_do_resize, leading to out-of-bounds write in fbcon_redraw_softback.

Comment 2 Alex 2020-09-09 10:08:42 UTC

Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

Comment 3 Alex 2020-09-09 10:26:28 UTC

Name: Yuan Ming (Tsinghua University)

Comment 4 Eric Christensen 2020-09-09 18:01:30 UTC

Due to this flaw requiring a local user to trigger by using frame buffer fbcon, the impact has been rated as Low.

Comment 7 msiddiqu 2020-09-17 12:41:47 UTC
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1879955]

Comment 8 Justin M. Forbes 2020-09-21 12:55:51 UTC
This was fixed for Fedora with the 5.8.10 stable kernel updates.

Comment 23 Alex 2021-11-07 11:16:04 UTC
Before closing, checked that for the rhel-9 fixed.

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