Bug 2112688 (CVE-2020-36557) - CVE-2020-36557 kernel: race condition between the VT_DISALLOCATE ioctl and closing/opening of ttys, causing a use-after-free in con_shutdown().
Summary: CVE-2020-36557 kernel: race condition between the VT_DISALLOCATE ioctl and cl...
Keywords:
Status: NEW
Alias: CVE-2020-36557
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: 2112690 1875585 2112689 2112691 2112692
Blocks: 2109700
TreeView+ depends on / blocked
 
Reported: 2022-07-31 17:10 UTC by Alex
Modified: 2023-01-29 13:25 UTC (History)
49 users (show)

Fixed In Version:
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Doc Text:
A use-after-free flaw was found in the Linux kernel’s Virtual Terminal subsystem in how a user calls the VT_DISALLOCATE ioctl during the closing/opening of ttys. This flaw allows a local user to crash the system.
Clone Of:
Environment:
Last Closed:


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Description Alex 2022-07-31 17:10:52 UTC
A use-after-free vulnerability was found in drivers/tty/vt/vt.c in the Linux kernel before 5.6.2.
A race condition between the VT_DISALLOCATE ioctl and closing/opening of ttys could lead to a use-after-free in con_shutdown().

Reference:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ca4463bf8438b403596edd0ec961ca0d4fbe0220


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