Date: Wed, 17 Mar 2021 18:39:14 +0300 From: Evgenii Shatokhin <eshatokhin@...tuozzo.com> To: Salvatore Bonaccorso <carnil@...ian.org> Cc: oss-security@...ts.openwall.com Subject: Re: CVE-2021-20219 Linux kernel: improper synchronization in flush_to_ldisc() can lead to DoS On 17.03.2021 18:29, Salvatore Bonaccorso wrote: > Hi Rohit, > > On Wed, Mar 17, 2021 at 04:17:05PM +0100, Greg KH wrote: >> On Wed, Mar 17, 2021 at 07:45:59PM +0530, Rohit Keshri wrote: >>> Hello Team, >>> >>> A denial of service vulnerability was found in n_tty_receive_char_special >>> in drivers/tty/n_tty.c of the Linux kernel. In this flaw a local attacker >>> with a normal user privilege could delay the loop (due to a changing >>> ldata->read_head, and a missing sanity check) and cause a threat to the >>> system availability. >>> >>> 'CVE-2021-20219' was assigned by Red Hat. >>> >>> Acknowledgements: Evgenii Shatokhin (Virtuozzo Research LLC) >> >> Really? Not the tools or people that reported this issue and fixed it >> in the community back in 2018? > > Can you clarify, would 3d63b7e4ae0d ("n_tty: Fix stall at > n_tty_receive_char_special().") be the upstream fix you are referring > to for it? Sorry for jumping in. Yes, this is the original fix, but the issue I reported is specific to RHEL 7: their backport of that fix was incomplete. > > Regards, > Salvatore > . Regards, Evgenii >
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