From: Oleg Nesterov <oleg@redhat.com>
To: Kees Cook <kees@kernel.org>
Cc: cve@kernel.org, linux-kernel@vger.kernel.org,
linux-cve-announce@vger.kernel.org,
Greg Kroah-Hartman <gregkh@kernel.org>,
Jinjie Ruan <ruanjinjie@huawei.com>
Subject: Re: CVE-2026-89603: entry: Fix seccomp bypass after ptrace with TSYNC
Date: Thu, 15 Oct 2026 18:34:13 +0200 [thread overview]
Message-ID: <atEAhWWDDOo4kWSR@redhat.com> (raw)
In-Reply-To: <20261015162119.1a1e0d-kees@kernel.org>
On 10/15, Kees Cook wrote:
>
> On Fri, Sep 11, 2026 at 09:44:52PM +0200, Greg Kroah-Hartman wrote:
> > This race condition could allow an unprivileged process to execute
> > a prohibited system call (e.g., execve) that the newly installed filter
> > was intended to block, especially since the tracer might have modified
> > the system call number during the ptrace stop.
>
> I'm disputing this one: please reject CVE-2026-89603. The fix is a fine
> consistency change, but the flaw gave neither the tracer nor the tracee
> anything they didn't already have.
Thanks Kees!
I fully agree with both points. The patch is fine, but it doesn't fix
any security problem.
Oleg.
next prev parent reply other threads:[~2026-10-15 16:35 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <2026091133-CVE-2026-89603-dad5@gregkh>
2026-10-15 16:25 ` Kees Cook
2026-10-15 16:34 ` Oleg Nesterov [this message]
2026-10-16 6:30 ` Greg Kroah-Hartman
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