Bug 1893287 (CVE-2020-25668) - CVE-2020-25668 kernel: race condition in fg_console can lead to use-after-free in con_font_op
Summary: CVE-2020-25668 kernel: race condition in fg_console can lead to use-after-fre...
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2020-25668
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: 1893288
Blocks: 1891756 1939821
TreeView+ depends on / blocked
 
Reported: 2020-10-30 16:27 UTC by Guilherme de Almeida Suckevicz
Modified: 2024-03-25 16:52 UTC (History)
45 users (show)

Fixed In Version: kernel 5.10-rc3
Doc Type: If docs needed, set a value
Doc Text:
A use-after-free flaw was found in the Linux kernel’s TTY driver functionality in the way the user triggers the con_font_op function. This flaw allows a local user to crash or escalate their privileges on the system or expose sensitive information (kernel memory).
Clone Of:
Environment:
Last Closed: 2020-11-18 11:28:33 UTC
Embargoed:

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Description Guilherme de Almeida Suckevicz 2020-10-30 16:27:48 UTC 
A flaw was found in Linux Kernel because access to the global variable fg_console is not properly synchronized leading to a use after free in con_font_op.

Reference:
https://www.openwall.com/lists/oss-security/2020/10/30/1
Comment 1 Guilherme de Almeida Suckevicz 2020-10-30 16:30:51 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1893288]
Comment 2 Alex 2020-11-15 19:44:57 UTC 
The patch:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=90bfdeef83f1d6c696039b6a917190dcbbad3220
Comment 3 Product Security DevOps Team 2020-11-18 11:28:33 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-2020-25668
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