Follow @Openwall on Twitter for new release announcements and other news
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Date: Wed, 10 Feb 2021 20:34:37 +0530
From: Rohit Keshri <>
Subject: CVE-2021-20200: Linux kernel: close race between munmap() and expand_upwards()/downwards()

Hello Team,

A use-after-free flaw may be seen due to a race problem while in
detach_vmas_to_be_unmapped() in mm/mmap.c in VMA access while
munmap(). This flaw could allow a local attacker with a user privilege
to crash the system, because VMA with VM_GROWSDOWN or VM_GROWSUP flag
set may change their size under mmap_read_lock(). This vulnerability
could even lead to a kernel information leak problem.

'CVE-2021-20200' was assigned by Red Hat.


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

Powered by blists - more mailing lists

Please check out the Open Source Software Security Wiki, which is counterpart to this mailing list.

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.