From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 D7DE63E171F for ; Fri, 12 Jun 2026 07:39:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781249962; cv=none; b=hmYtUzwK7b/nL1hGTacmu3c092k4QoFYig3egI0TQcbz0AS6yQWRrZaOc9W7+/SE85ws8+kD/yEuUEDgP4WDiiH4A58oQ+l8f90Hwgk5V2idU7EPscuOJRnIYBEhpbO3A5bk4ypw0OzTt8rKMNqFDlW83c+c9f29xVZM76plKrI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781249962; c=relaxed/simple; bh=2rgUav12Rj9lvJhtrsfA/UmwOZaNrAeAdtJ+A3GSaCs=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=tVGTfutSdO7ntxfSESc9HjGG77dBZyu4QCTKaSMPErpleXB6cR/aDxpPxXMoGplK2mIjj5Lwr6aoSKFq+9t870B1o98LZXaAcWeXs0doaXrghHZPR6rOIl8zgAM3ojSwgHoh4oLOGspzzu7j1s71uP8iMrmtukSh5YYdXemlhgE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=aksgN5F2; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="aksgN5F2" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B0F831F000E9; Fri, 12 Jun 2026 07:39:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1781249958; bh=WbdSxAPr7LvFZGaMW88nAvqMlgGrpjatoEXO8sux2To=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=aksgN5F25pWWHrrDWL8v3Cl24ZXsqtba1+1WhhOtcsiBqIKuYPqTTrXBxO+kqX5tV /4UUGgOA2UgfSAAbud9q9Dlw1u8+h2f3yQl2FbCbh37qHUlPdIgjopTfuP3ztpjgIr DxfQO4Xl6TDuoKh1Ktnu941iUlU8zCTTXhx+J3v0= Date: Fri, 12 Jun 2026 09:38:15 +0200 From: Greg KH To: "Zhenpeng (Leo) Lin" Cc: security@kernel.org, stable@vger.kernel.org, disclosures Subject: Re: Exploitable reuseport cBPF UAF fixed in mainline but not backported to any stable/LTS Message-ID: <2026061225-brisket-quickly-94b2@gregkh> References: Precedence: bulk X-Mailing-List: stable@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: On Thu, Jun 11, 2026 at 03:01:15PM -0700, Zhenpeng (Leo) Lin wrote: > Hello Linux kernel security team, You also sent this to a public mailing list for some reason... > Fix > --- > - Mainline commit 18fc650ccd7f ("bpf: Free reuseport cBPF prog after > RCU grace period.", Kuniyuki Iwashima), first released in v7.1-rc3. > It defers the cBPF free with call_rcu(). That commit has been queued up already for the next round of stable kernel releases. Next time, if you wish to have a commit applied to older kernels, please take a look at: https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html for how to do this properly. thanks, greg k-h