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: Nobody
QA Contact:
URL:
Whiteboard:
Depends On: 1875585 2112689 2112690 2112691 2112692 2183122 2183123 2183124 2183125
Blocks: 2109700
TreeView+ depends on / blocked
 
Reported: 2022-07-31 17:10 UTC by Alex
Modified: 2023-09-26 21:55 UTC (History)
47 users (show)

Fixed In Version:
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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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