oss-security - CVE-2021-20226 kernel: use-after-free in io

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Date: Fri, 5 Feb 2021 20:27:57 +0530
From: Rohit Keshri <rkeshri@...hat.com>
To: oss-security@...ts.openwall.com
Subject: CVE-2021-20226 kernel: use-after-free in io_uring feature

Hello Team,

A use-after-free flaw was found in the io_uring in Linux kernel, where a
local attacker with a user privilege could cause a denial of service
problem on the system

The issue results from the lack of validating the existence of an object
prior to performing operations on the object by not incrementing the file
reference counter while in use.

The highest threat from this vulnerability is to data integrity,
confidentiality and system availability.

'CVE-2021-20226' was assigned by Red Hat.

This issue was reported by Ryota Shiga of Flatt Security Team.

Reference:

https://www.zerodayinitiative.com/advisories/ZDI-21-001/

Thanks and Regards
..
Rohit Keshri / Red Hat Product Security Team
PGP: OX01BC 858A 07B7 15C8 EF33 BFE2 2EEB 0CBC 84A4 4C2D

secalert@...hat.com for urgent response

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