Bug 1969497 (CVE-2020-36387) - CVE-2020-36387 kernel: use-after-free related to io_async_task_func() reference holding in fs/io_uring.c
Summary: CVE-2020-36387 kernel: use-after-free related to io_async_task_func() referen...
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2020-36387
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1969498
Blocks: 1969499
TreeView+ depends on / blocked
 
Reported: 2021-06-08 14:14 UTC by Guilherme de Almeida Suckevicz
Modified: 2022-05-17 08:55 UTC (History)
43 users (show)

Fixed In Version:
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Doc Text:
A flaw was found in the Linux kernel. A use-after-free can occur to io_async_task_func and ctx reference holding. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
Clone Of:
Environment:
Last Closed: 2021-06-08 14:29:38 UTC
Embargoed:


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Description Guilherme de Almeida Suckevicz 2021-06-08 14:14:27 UTC
An issue was discovered in the Linux kernel before 5.8.2. fs/io_uring.c has a use-after-free related to io_async_task_func and ctx reference holding.

Reference:
https://sites.google.com/view/syzscope/kasan-use-after-free-read-in-io_async_task_func

Upstream patch:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6d816e088c359866f9867057e04f244c608c42fe

Comment 1 Guilherme de Almeida Suckevicz 2021-06-08 14:15:13 UTC
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1969498]

Comment 2 Justin M. Forbes 2021-06-08 19:04:11 UTC
This was fixed for Fedora with the 5.7.16 stable kernel updates.


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