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 DDBD7396B9A for ; Sun, 18 Oct 2026 15:38:01 +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=1792337882; cv=none; b=uThqhsUrQ3kSzCczeU+Yju5SJoY9yEia6cg7+VnlSRjip3UYuKBRxPcNXWi1NdN4s+VShGYtLofE02gc++MGkyYMsI2aHeyiKkzYtRQDx4SrguhRAadc4bub4vBCCMwZc8Ta6ua2iBqpniFfa8PnYoEKFp6UAdTdw/GMo/VNHko= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792337882; c=relaxed/simple; bh=fRuDPLzbF6Mj9uLXCHEidoKuT4BY5YkqzVbSwfk9lek=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=Rmm598xZIwVTruu+mUIZLtZwolaTA2jj8RnQsdSLNJ+w7jyK9tBueUgCAwFexR81PM6HLtesTZ+Ll5yW/eeTDWDLdpuVsrSyC9iTgak8+cPGWlkWCV6vV5VAeWRjokCIlDicJbSEIQDyVRf5ttkC4zoDqO0iEsfgTzD6OyhLQgI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=pqnbCydd; 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="pqnbCydd" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0C04E1F000C4; Sun, 18 Oct 2026 15:38:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1792337881; bh=bq2MkkbtbQonw+JOQRveP93d4JO1XScIvkQPsd8uUcI=; h=From:To:Cc:Subject:Date:Reply-To; b=pqnbCydd3k2/voXYF0YRsfu/GNXImNAUc8i2NbAv80QY0xYpfpLrF486j/4o3OGnn aa97oLYaFMlk4X4HHUIicAoeXiWuUA65agHLYa6vDGD5OtrSuyNw28XeZA2XE59GDa ReZjZKU8WDgFfUVvUN5pnYdaFVY+mo3vXLHmfVBA= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-98624: netfilter: nfnetlink_queue: hold nfnl mutex in event notifier Date: Sun, 18 Oct 2026 17:18:08 +0200 Message-ID: <2026101842-CVE-2026-98624-eceb@gregkh> X-Mailer: git-send-email 2.56.0 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=3873; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=upKGaTykwrVDb1tYVlbwgLbWSUuN1mp7Kx1OYCDR4AU=; b=owGbwMvMwCRo6H6F97bub03G02pJDFlXHs1zeClpIys4xfZ3uWksf/2U/Tk6uwq3xzYrO9h/m vOne2dERywLgyATg6yYIsuXbTxH91ccUvQytD0NM4eVCWQIAxenAEzkeTrD/CCHOLYSJuMFN/Zo OV1LiP7hYiKTw7BgvfSKDeuvJfEv8/7DX9ERXFq2POsFAA== 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: netfilter: nfnetlink_queue: hold nfnl mutex in event notifier We must serialize the release notifier and the config netlink function. A concurrent thread can issue close() which can call the release function while unrelated socket processes UNBIND request for same portid: Oops: general protection fault, [..] RIP: 0010:__instance_destroy+0x60/0x210 [nfnetlink_queue] Call Trace: nfqnl_recv_config+0x9b0/0xdc0 [nfnetlink_queue] nfnetlink_rcv_msg+0x7c2/0xeb0 ? __pfx_nfnetlink_rcv_msg+0x10/0x10 After this, parallel UNBIND and URELEASE events are impossible. This change isn't nice, but its the shortest fix given instances are not refcounted and the nfnetlink config callback drops the rcu read lock early due to need for sleeping allocations. The Linux kernel CVE team has assigned CVE-2026-98624 to this issue. Affected and fixed versions =========================== Issue introduced in 2.6.14 with commit 7af4cc3fa158ff1dda6e7451c7e6afa6b0bb85cb and fixed in 5.10.271 with commit 46432f2e76f7c385d82506304a2928e7d293289f Issue introduced in 2.6.14 with commit 7af4cc3fa158ff1dda6e7451c7e6afa6b0bb85cb and fixed in 5.15.222 with commit 597320337c3da06c92a9e95cfc755da66fedc476 Issue introduced in 2.6.14 with commit 7af4cc3fa158ff1dda6e7451c7e6afa6b0bb85cb and fixed in 6.1.189 with commit 2e9be1302f25c9be51c2fb8c907bc6d8a1050e33 Issue introduced in 2.6.14 with commit 7af4cc3fa158ff1dda6e7451c7e6afa6b0bb85cb and fixed in 6.6.158 with commit d559e06a5ab7c064100aafd5c826eadd0f1c6216 Issue introduced in 2.6.14 with commit 7af4cc3fa158ff1dda6e7451c7e6afa6b0bb85cb and fixed in 6.12.112 with commit 1d1184411599a7c2217560bab3bbe641c6d03b95 Issue introduced in 2.6.14 with commit 7af4cc3fa158ff1dda6e7451c7e6afa6b0bb85cb and fixed in 6.18.55 with commit 07a3ec8fdc5a1267c00cd6fd1cf8bbb5cda913c1 Issue introduced in 2.6.14 with commit 7af4cc3fa158ff1dda6e7451c7e6afa6b0bb85cb and fixed in 7.2.9 with commit 8137a39e08e838ced234044384740ceeb99ed388 Issue introduced in 2.6.14 with commit 7af4cc3fa158ff1dda6e7451c7e6afa6b0bb85cb and fixed in 7.3-rc5 with commit 9461613afc59acef44a0071b0dd5075f6e993ffe 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-2026-98624 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/netfilter/nfnetlink_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/46432f2e76f7c385d82506304a2928e7d293289f https://git.kernel.org/stable/c/597320337c3da06c92a9e95cfc755da66fedc476 https://git.kernel.org/stable/c/2e9be1302f25c9be51c2fb8c907bc6d8a1050e33 https://git.kernel.org/stable/c/d559e06a5ab7c064100aafd5c826eadd0f1c6216 https://git.kernel.org/stable/c/1d1184411599a7c2217560bab3bbe641c6d03b95 https://git.kernel.org/stable/c/07a3ec8fdc5a1267c00cd6fd1cf8bbb5cda913c1 https://git.kernel.org/stable/c/8137a39e08e838ced234044384740ceeb99ed388 https://git.kernel.org/stable/c/9461613afc59acef44a0071b0dd5075f6e993ffe