From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1814149E5E9 for ; Thu, 15 Oct 2026 16:35:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792082119; cv=none; b=RHSXRTrYIh+L7j4uuMepTpr7pD2WIJ/2KFgNs282YhSFdjLaKuqBpeercqmRH1AUpdHEri9xxcsXbsADj+nV7t7nygeiQ43zeQQBwmuq9z6e+RxGoPa3HaHyThM3RQhYqMHbyXnTcQnucJCiL0oOEnO1QFfGlCUAx5sz0I3SdIA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792082119; c=relaxed/simple; bh=Dk8IqLqzesE4807xMJiy5ShJzomsE25WxSYU1Au3Fys=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=C/L+igOmJWi3qPUrR9vECV+iNk95RythhPti8wXqwusqksARQYYRdpZ6ma5aeNdDKUZFvmIVI1qLZTQ6aQG4TrHRP64iGPxdinynTzymmIGOvuJ8t/sATSJMHPdnD4IBcrNBZCMJSjgVuNb7K7k1ke3CEhxkzgZ9Y4TJ6a41IJQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=DJqnVtwj; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="DJqnVtwj" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1792082106; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=Dk8IqLqzesE4807xMJiy5ShJzomsE25WxSYU1Au3Fys=; b=DJqnVtwj0cnZOB5eT/XumEzt/UdhXP+Qz0+6ak09hL1rJOl4+obQqdpeyCbNK6FJiPLMXG TUPeTNKipES5Wakx41mmjHiB8S6b7yleKo7N3sMDwA0giIQ6fuaVE6frrtK/ZBZOBaEl9h 7ZFrkRp19FIe+0jSZaEMu74i3stgNec= Received: from mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-209-uG3lX792O7WkRnxg1-5fig-1; Thu, 15 Oct 2026 16:35:00 +0000 X-MC-Unique: uG3lX792O7WkRnxg1-5fig-1 X-Mimecast-MFC-AGG-ID: uG3lX792O7WkRnxg1-5fig_1792082099 Received: from mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.17]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id E3E1F1967C57; Thu, 15 Oct 2026 16:34:15 +0000 (UTC) Received: from onestero-thinkpadp1gen7.tpbc.csb (headnet04.pony-001.prod.iad2.dc.redhat.com [10.2.32.116]) by mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with SMTP id 3D0EC195608A; Thu, 15 Oct 2026 16:34:14 +0000 (UTC) Received: by onestero-thinkpadp1gen7.tpbc.csb (nbSMTP-1.00) for uid 13628 oleg@redhat.com; Thu, 15 Oct 2026 18:34:15 +0200 (CEST) Date: Thu, 15 Oct 2026 18:34:13 +0200 From: Oleg Nesterov To: Kees Cook Cc: cve@kernel.org, linux-kernel@vger.kernel.org, linux-cve-announce@vger.kernel.org, Greg Kroah-Hartman , Jinjie Ruan Subject: Re: CVE-2026-89603: entry: Fix seccomp bypass after ptrace with TSYNC Message-ID: References: <2026091133-CVE-2026-89603-dad5@gregkh> <20261015162119.1a1e0d-kees@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20261015162119.1a1e0d-kees@kernel.org> X-Scanned-By: MIMEDefang 3.0 on 10.30.177.17 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.