Re: CVE-2021-20219 Linux kernel: improper synchronization in flush_to_ldisc() can lead to DoS

[Rohit Keshri <rkeshri () redhat com>]

Hello Team,

> Given that the above CVE is not public in any database that I can find,
> one can only hope that the text will reflect what really is happening
> here.  Rohit, why was this even published?

> Again, stuff like this is just causing extra work by everyone else for
> no good reason that I can see.


I understand and apologize for the confusion.


This issue was reported for rhel7 to us (which was not seen in rhel8
or later versions),  but it also  applies to  kernel before this
('3d63b7e4ae0dc') patch or kernel without this patch.


$ git tag --contains  3d63b7e4ae0dc
v4.18
v4.18-rc3
v4.18-rc4
v4.18-rc5
v4.18-rc6
v4.18-rc7
v4.18-rc8

..


Since this issue was reported to us,  identified as a security flaw,
and was fixed in the upstream, we decided to assign a CVE.


We appreciate and value your feedback and co-operation.

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

secalert () redhat com for urgent response