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 C35EF3815F0 for ; Sat, 15 Aug 2026 06:33:05 +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=1786775586; cv=none; b=svI/gnFllML8B4Ff8ID97kUMLFnrPQU7iTEcIQwU2hiK3fYY8StvCOCNRhxSgbIKT61l9gs2CmPvOjDtHo3b/jWcLMcD/jsi2D6Ob/4VApLJef0arclu0Y5udZhHyiXh0l/8xUf5mpurvas1p7/XscQPlJ6I40swBOqdUOPOA9A= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786775586; c=relaxed/simple; bh=IvhomsQ8ouEXmdZm6+/l34RyL7CTTncKVx2SUOJiXPI=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=ALl79MzkpyO+txroIcj0UuH5G3m9SVuxgRjcGVWMZJf3/JrdpdfpWBA1+Td5OQrke+HtyWKWZeF5efbx1UZBCdM3Y7pb+jFN97BHh5ZZEdR+oE3SynKpTeqQEw7GgwlI1s9sH1mwJ8dUPhRcZzJKZvmYAw5bhzZ2iNTYIajKVqk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=MD7AJ+Xb; 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="MD7AJ+Xb" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D1C441F000E9; Sat, 15 Aug 2026 06:33:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1786775585; bh=o6XO8VSsvj/RIc935u09YRuVVgtMpUjdShCbH2ahbP0=; h=From:To:Cc:Subject:Date:Reply-To; b=MD7AJ+XbAy4lRZrhMXbcDI5kEQbD11LKTKTJJnEJiXgKTrUgxdEt5URIb/rW1N+1b aqB+YhJRKXQFV97rxxaoct+z+LY8qZwr5T/0q+pDeCZINDOjrSLIMAqyIzuAq/9Hw5 NlXKKLDzJkw/13qPSIUaFpcAnuvzmu2Xy406Vlis= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-74285: net: Stop leased rxq before uninstalling its memory provider Date: Sat, 15 Aug 2026 15:10:12 +0900 Message-ID: <2026081547-CVE-2026-74285-6a80@gregkh> X-Mailer: git-send-email 2.55.0 Reply-To: , Precedence: bulk X-Mailing-List: linux-cve-announce@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2878; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=O0ab2A2oli9ogUBKDZngGsWFaBvRXwsMV3i+1Ly+vOI=; b=owGbwMvMwCRo6H6F97bub03G02pJDFkNjOzfHxdKhl+b9UP1onvK7rQp7Pn+YYE8C7m9bGK2G t+PFljUEcvCIMjEICumyPJlG8/R/RWHFL0MbU/DzGFlAhnCwMUpABMx2M8wz/RMevDKwjvGUnPe zXqmwK8UIM4hxjDP2O75HzYjxce7nk/9eeVfwZe4HRdeAQA= X-Developer-Key: i=gregkh@linuxfoundation.org; a=openpgp; fpr=F4B60CC5BF78C2214A313DCB3147D40DDB2DFB29 Content-Transfer-Encoding: 8bit From: Greg Kroah-Hartman Description =========== In the Linux kernel, the following vulnerability has been resolved: net: Stop leased rxq before uninstalling its memory provider netif_rxq_cleanup_unlease() tears down the memory provider that was installed on a physical RX queue through a netkit queue lease. It currently revokes the provider's DMA mappings before stopping the physical queue: __netif_mp_uninstall_rxq(virt_rxq, p); /* DMA unmap */ __netif_mp_close_rxq(phys_rxq->dev, rxq_idx, p); /* queue stop */ This inverts the ordering used by the regular teardown paths (normal device unregister and the io_uring zcrx close path), which stop the queue before revoking the provider's mappings. With the physical queue still live, its NAPI can keep consuming net_iov entries from the page_pool alloc cache after the __netif_mp_uninstall_rxq() has already cleared their dma_addr, opening a window for the device to DMA to a stale or zero address. Fix it by swapping the two calls so the queue is stopped (and its NAPI quiesced) before the provider is uninstalled. No functional regression was observed across repeated runs of the nk_qlease.py HW selftest, which exercises the lease teardown path; this was tested against fbnic QEMU emulation. The Linux kernel CVE team has assigned CVE-2026-74285 to this issue. Affected and fixed versions =========================== Issue introduced in 7.1 with commit 5602ad61ebee99c83081fba1aaf5814736edc3e7 and fixed in 7.1.5 with commit 03f4c6ed3cffbfce0b85a3a0193d08a46692a9f8 Issue introduced in 7.1 with commit 5602ad61ebee99c83081fba1aaf5814736edc3e7 and fixed in 7.2-rc1 with commit 37314c9dbe95b4d924c7b61aaf563cec4f4e4133 Please see https://www.kernel.org for a full list of currently supported kernel versions by the kernel community. Unaffected versions might change over time as fixes are backported to older supported kernel versions. The official CVE entry at https://cve.org/CVERecord/?id=CVE-2026-74285 will be updated if fixes are backported, please check that for the most up to date information about this issue. Affected files ============== The file(s) affected by this issue are: net/core/netdev_rx_queue.c Mitigation ========== The Linux kernel CVE team recommends that you update to the latest stable kernel version for this, and many other bugfixes. Individual changes are never tested alone, but rather are part of a larger kernel release. Cherry-picking individual commits is not recommended or supported by the Linux kernel community at all. If however, updating to the latest release is impossible, the individual changes to resolve this issue can be found at these commits: https://git.kernel.org/stable/c/03f4c6ed3cffbfce0b85a3a0193d08a46692a9f8 https://git.kernel.org/stable/c/37314c9dbe95b4d924c7b61aaf563cec4f4e4133