From: Pablo Neira Ayuso <pablo@netfilter.org>
To: Florian Westphal <fw@strlen.de>
Cc: 성병찬 <tjdqudcks0424@naver.com>,
netfilter-devel@vger.kernel.org, phil@nwl.cc
Subject: Re: [BUG] netfilter: IPv6 conntrack fragment reassembly truncates header offset
Date: Tue, 29 Sep 2026 11:07:04 +0200 [thread overview]
Message-ID: <art_uBuhM9QUosnZ@chamomile> (raw)
In-Reply-To: <artmviCh2h4vYLKG@strlen.de>
On Tue, Sep 29, 2026 at 09:20:30AM +0200, Florian Westphal wrote:
> 성병찬 <tjdqudcks0424@naver.com> wrote:
> > I found a reproducible IPv6 conntrack fragment reassembly bug in:
> >
> > net/ipv6/netfilter/nf_conntrack_reasm.c
> >
> > Tested kernel:
> >
> > Linux v7.2.8
> > commit 9a66fdc0d7fd55f54235524a73435af99051e46f
> > x86_64 with KASAN enabled
> >
> > In find_prev_fhdr(), the previous Next Header offset is stored in u8:
> >
> > u8 prev_nhoff = netoff + offsetof(struct ipv6hdr, nexthdr);
>
> Please send a formal patch, thanks.
For the record, there is one already.
https://patchwork.ozlabs.org/project/netfilter-devel/patch/20260822214012.1028305-2-Jeremy.Jean@oss.cyber.gouv.fr/
But I stumbled on it because lacking a reproducer, sorry.
We can include it in the next batch.
next prev parent reply other threads:[~2026-09-29 9:07 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-29 5:34 [BUG] netfilter: IPv6 conntrack fragment reassembly truncates header offset 성병찬
2026-09-29 7:20 ` Florian Westphal
2026-09-29 9:07 ` Pablo Neira Ayuso [this message]
[not found] <31da96413a406da2116f44df2db84f@cweb009.nm>
2026-09-29 9:01 ` Pablo Neira Ayuso
2026-09-29 9:14 ` 성병찬
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