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 44C7C3E1723 for ; Tue, 6 Oct 2026 10:27:55 +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=1791282476; cv=none; b=EydZtbv2P+tHQ4cKLIt5urYBj29nuLeQay2oaIzs31VHUvLOgOmt4wswOyPcKtrvdzzVnd+QyuDT4USliP6WJY5fKUZioJ9iR1s8cqFM8/ae41on+9WLefq33vf8U5oMvYepfDASpFIFyQ4ohROnCWLwKv2bKWNpUMNHER0xiGE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791282476; c=relaxed/simple; bh=Ct/etsTa0iwC4/Tv55+cwpBLPl4Lz1toUfFf6y6NtkA=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=imT74Wew8wc5PMjOqFDtp5W0GLNXyRUkayqpQPwd+/YeOecE9jTT7Ly8j+oHl7ED3ntb830seDW+Q1S9yFcIRilvWGfx/RbVipmsg6ohOe9DcvuVRrtAQrJVmI0IJmO5B6ZoruEB9djm0iCbENFH3uoQcloLpDDr9DQ1ZBCtYhs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=fr2htUvc; 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="fr2htUvc" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A5DB71F000FF; Tue, 6 Oct 2026 10:27:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1791282475; bh=UpzGd1bZCSeJejrG5sK56x+Ew49VdpPNhQYLFjGWsUs=; h=From:To:Cc:Subject:Date:Reply-To; b=fr2htUvcvwfQ01FfhizEduY++faRXdH4k5Er5TNnuXdIUy4SlKgI3aWnAEnQEKnSH PAiMhuDeM/fDVMkkzcq+MbYPByMUecG7X3dQ9PQlPBYitCxuqmjNZzkZn/XIoKZiHI 70N31wN3insXukOI+K4AoKJuGbRibAzzlVWMHWpI= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-98320: netfilter: flowtable: hold reference on ct until flow is released Date: Tue, 6 Oct 2026 10:47:01 +0200 Message-ID: <2026100613-CVE-2026-98320-cb40@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=3493; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=rClRTsDy4j3ndyDdzpxL1gK6Sn4xBBy8qtgCya/KvaY=; b=owGbwMvMwCRo6H6F97bub03G02pJDFlHtkpyrPz6+1j3NoWvFxlSBKatkY3rv3Ks/oF4du6KD 7o8FeHOHbEsDIJMDLJiiixftvEc3V9xSNHL0PY0zBxWJpAhDFycAjCR6BiGBfNaQg60aajPuTQ/ e4aRmHT3nA6xPwzza8XeSD7du+3g3scaetxWFoc3PejPAAA= 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: flowtable: hold reference on ct until flow is released nf_ct_put() releases the ct->ext area inmediately, the rcu typesafe semantics also allow to refer to the wrong conntrack from the flowtable datapath. Hold reference on ct until flow is released after rcu grace period. Add rcu_barrier() on module exit path, to ensure pending flow entries are release before module goes away. The Linux kernel CVE team has assigned CVE-2026-98320 to this issue. Affected and fixed versions =========================== Issue introduced in 4.16 with commit 0ff90b6c20340e57616a51ae1a1bf18156d6638a and fixed in 5.10.271 with commit 93ff1594be1aad4da364462dd8db050ebcfda2de Issue introduced in 4.16 with commit 0ff90b6c20340e57616a51ae1a1bf18156d6638a and fixed in 5.15.222 with commit eed6997e8dc40593a539fcc722e7ed51b18db86c Issue introduced in 4.16 with commit 0ff90b6c20340e57616a51ae1a1bf18156d6638a and fixed in 6.1.189 with commit 61c6688be282277c6e91ab286a7acd0ae8681ac6 Issue introduced in 4.16 with commit 0ff90b6c20340e57616a51ae1a1bf18156d6638a and fixed in 6.6.158 with commit a43cd2b67b91e943273c913237a7a88c50cdcfbc Issue introduced in 4.16 with commit 0ff90b6c20340e57616a51ae1a1bf18156d6638a and fixed in 6.12.112 with commit 8274cdc5f9c57e17ed77fc4ba76212536c840f25 Issue introduced in 4.16 with commit 0ff90b6c20340e57616a51ae1a1bf18156d6638a and fixed in 6.18.54 with commit 12c1ac230f4ca16e0017b62a963ab75e0b48074f Issue introduced in 4.16 with commit 0ff90b6c20340e57616a51ae1a1bf18156d6638a and fixed in 7.2.8 with commit d9e6175a3ee48209ee65f294fc567b4e16b29b74 Issue introduced in 4.16 with commit 0ff90b6c20340e57616a51ae1a1bf18156d6638a and fixed in 7.3-rc4 with commit e75a9fa1d44bcbd66ea02e8781bcca6ea4076e0d 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-2026-98320 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/nf_flow_table_core.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/93ff1594be1aad4da364462dd8db050ebcfda2de https://git.kernel.org/stable/c/eed6997e8dc40593a539fcc722e7ed51b18db86c https://git.kernel.org/stable/c/61c6688be282277c6e91ab286a7acd0ae8681ac6 https://git.kernel.org/stable/c/a43cd2b67b91e943273c913237a7a88c50cdcfbc https://git.kernel.org/stable/c/8274cdc5f9c57e17ed77fc4ba76212536c840f25 https://git.kernel.org/stable/c/12c1ac230f4ca16e0017b62a963ab75e0b48074f https://git.kernel.org/stable/c/d9e6175a3ee48209ee65f294fc567b4e16b29b74 https://git.kernel.org/stable/c/e75a9fa1d44bcbd66ea02e8781bcca6ea4076e0d