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 3D9D13AA4F2 for ; Sun, 19 Jul 2026 15:47:21 +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=1784476042; cv=none; b=WOveWGn0FYDT3OFsEUJBTz7bgl3OtSWmiX5//DvK6iCDmhpjzzjJnGSHtvx9cX0lWtYAUBqKhQ7tgBs28KTQLA5Kp2BMY1Z6EybfC26ODLnpe74hnuiQzOFQ4zudCUjkY5kC/v2HgNvsp8bsEzz+KpQP8p8M8r+PGAZrzbXpoAU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784476042; c=relaxed/simple; bh=tjI8U4hXdh8B/1Y2M5OI3zkJXmkgmL32weGlds90M1Y=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=WvkZn+esJAZZlTPQZt9uFaEj2FpQWAqMV4nrMZcNF0lng1hw+bQTIpylTfFvl5s6Z83ElhqaHQKEA5iv6DSBbUxNcxkjbXKLiSmLbbUowgglLG84Ydesn83kljC9gefBtNDA/PYmSStISBXIX+6n018gF3KUMndkDoousGf4Clc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=VUXyKlQA; 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="VUXyKlQA" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7DE4B1F000E9; Sun, 19 Jul 2026 15:47:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784476041; bh=pggdp02KeQhbKFrLS1OvHn8w6QlStGs7F+OyFyUw4hQ=; h=From:To:Cc:Subject:Date:Reply-To; b=VUXyKlQAcAvX/83ZrowCQgR/jY1fSOxh3iL+GVQB6yA/tVZctDh6D5RnPkQU7bJWK J1xpS9J/NIp2jDg8M4he8emy7bqssmxFGXBWwjD7QUkPIUiEDB7ciAeGOKkUfcCzwf mEgA8zwUVtWhNt+LIK3R86s3uXK7p5RsoOWZZvIw= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-64175: wifi: iwlwifi: mld: stop TX during firmware restart Date: Sun, 19 Jul 2026 17:40:37 +0200 Message-ID: <2026071937-CVE-2026-64175-d543@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=3301; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=9oJtSYJc7KQmR5RvlolWhy52CjgLY5EOz6lG21rxvqA=; b=owGbwMvMwCRo6H6F97bub03G02pJDFkx72tfrLE+27zF/5L/ERZmhp1J29ceNyzJUk+szFII/ H1XYeWljlgWBkEmBlkxRZYv23iO7q84pOhlaHsaZg4rE8gQBi5OAZjI/Y8M893WzpC5dcLcp8yX U01fac1v4wMZMxjmGS8VL2ZoKaldG1X4dkFys7RhhA8/AA== 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: wifi: iwlwifi: mld: stop TX during firmware restart When iwlwifi firmware crashes (e.g., NMI_INTERRUPT_UNKNOWN on Intel BE201/Wi-Fi 7), iwl_mld_nic_error() sets mld->fw_status.in_hw_restart to true. However, iwl_mld_tx_from_txq() does not check this flag before dequeuing frames from mac80211 and pushing them to the transport layer. Since the firmware is dead, iwl_trans_tx() returns -EIO for each frame, which then gets freed immediately. Under high-throughput conditions (e.g., Tailscale UDP traffic or active SSH sessions), this creates a tight dequeue-send-fail-free loop that wastes CPU cycles and generates rapid skb allocation churn, leading to memory pressure from slab fragmentation. The RX path already has this guard (iwl_mld_rx_mpdu checks in_hw_restart at rx.c:1906), and so does the TXQ allocation worker (iwl_mld_add_txqs_wk at tx.c:156). Add the same guard to iwl_mld_tx_from_txq() to stop all TX during firmware restart. Frames left in mac80211's TXQs are naturally drained after restart completes, when queue reallocation triggers iwl_mld_tx_from_txq() via iwl_mld_add_txq_list(), or when new upper-layer traffic invokes wake_tx_queue. Tested on ASUS Zenbook 14 UX3405CA with Intel BE201 (Wi-Fi 7) on kernel 6.19.5 where the firmware crashes approximately every 10-15 minutes under Tailscale traffic. The Linux kernel CVE team has assigned CVE-2026-64175 to this issue. Affected and fixed versions =========================== Issue introduced in 6.15 with commit d1e879ec600f9b3bdd253167533959facfefb17b and fixed in 6.18.34 with commit dc31c69476520bb4c2a208211a8d3c310a62c4d0 Issue introduced in 6.15 with commit d1e879ec600f9b3bdd253167533959facfefb17b and fixed in 7.0.11 with commit 13f1786395dbbf3df73337063c798f1266be6151 Issue introduced in 6.15 with commit d1e879ec600f9b3bdd253167533959facfefb17b and fixed in 7.1 with commit 2becb38a3e217ef2b2f42fddd7db7a25905ec291 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-2026-64175 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: drivers/net/wireless/intel/iwlwifi/mld/tx.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/dc31c69476520bb4c2a208211a8d3c310a62c4d0 https://git.kernel.org/stable/c/13f1786395dbbf3df73337063c798f1266be6151 https://git.kernel.org/stable/c/2becb38a3e217ef2b2f42fddd7db7a25905ec291