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 3B4F83783A0 for ; Sat, 15 Aug 2026 06:28:11 +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=1786775292; cv=none; b=AKlWgPEDDogTiRLEu8eK6lwb2lcW0uPcojvZ+TfgY9LylG8vcc0uMWY1nC/ebqv43aUACW6esh/cI3+cDtLMGQqnNtf1rbGUK1jhAzzoSjWwko6fGhkYFaK6dbcXIBRSHXeeg5UGZO70BFUnBR+nNeUXa8AblhJ13N7C44qydjA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786775292; c=relaxed/simple; bh=WUMOVFOGIKgzkoVY1/fCNkWLYrsexAoML7IZ2aNmyqw=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=DLtbpcJgPdgPchl6HK9s6CxdsGgrWqE09J0ognZZvUHDgWgKo9loWd+kX9XTZxgzbFtOfhubU/3Pb9amr+OWmUzTLUhyjqPz4fMefHDBcw9JjJ8MoWO4E3L54slCppZqnolrymqGUnXm36352Q+vuM4S4/9wl/OLzUG7/ClqHKg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=wF72VKGz; 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="wF72VKGz" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 910621F000E9; Sat, 15 Aug 2026 06:28:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1786775291; bh=jkB/xJh2TdgnVbm1s/ofMrWN4/4pXAOVlreCtBoWOjU=; h=From:To:Cc:Subject:Date:Reply-To; b=wF72VKGzCYk8eiYkLOY6tyinHfib3G05NPnrEakDpE7j8axuNJC15/q+jLnP7IMrN prqvH3+WcESezq4d3vMwt3jY1oO8BXRdpeIXqPS/eEvf5qPfhzjy+Ux8yZhHr67zDf WGRw/EMmPRi9EZKJzkbqVGOiELhwzdNu7VikDcaw= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-72436: netfilter: ipset: Don't use test_bit() in lockless RCU readers in hash types Date: Sat, 15 Aug 2026 15:08:35 +0900 Message-ID: <2026081528-CVE-2026-72436-eb00@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=3088; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=8alRQShkC+0GKAnpM8q4k/SJpgzP5okMtQKuhC/kn1Y=; b=owGbwMvMwCRo6H6F97bub03G02pJDFkNDF8M02XPz5liylG2mqluZdaTRxqvbh3xPclu4LHCb nvTl7U9HbEsDIJMDLJiiixftvEc3V9xSNHL0PY0zBxWJpAhDFycAjARxRqG+Q7yfe8+eD+c//2n xYZFL0KCfGfetWaYp/rgV7Xp0aV37Je8jn5XkLf4xuN2RQA= 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: ipset: Don't use test_bit() in lockless RCU readers in hash types Sashiko pointed out that there are a few lockless RCU readers using test_bit() which is a relaxed atomic operation and provides no memory barrier guarantees. Use test_bit_acquire() instead where the operation may run parallel with add/del/gc, i.e. is not one from the next cases - protected by region lock - in a set destroy phase - in a new/temporary set creation phase The Linux kernel CVE team has assigned CVE-2026-72436 to this issue. Affected and fixed versions =========================== Issue introduced in 4.2 with commit 18f84d41d34fa35d0d64bbaea01fe664553ecc06 and fixed in 6.1.178 with commit c107233d2ff4fd7cef5d02f9124b99194957a710 Issue introduced in 4.2 with commit 18f84d41d34fa35d0d64bbaea01fe664553ecc06 and fixed in 6.6.145 with commit 6329d3a9afe715fddda0460cfa46b496d61c2fe0 Issue introduced in 4.2 with commit 18f84d41d34fa35d0d64bbaea01fe664553ecc06 and fixed in 6.12.97 with commit 7445fe965b7d8756070a40e80f8b73348ccda1d7 Issue introduced in 4.2 with commit 18f84d41d34fa35d0d64bbaea01fe664553ecc06 and fixed in 6.18.40 with commit c4d257734e91bfcdc71d41843392dd6400b5bb1b Issue introduced in 4.2 with commit 18f84d41d34fa35d0d64bbaea01fe664553ecc06 and fixed in 7.1.5 with commit 3219d74e4536658c937fd878a327257b86ce80dd Issue introduced in 4.2 with commit 18f84d41d34fa35d0d64bbaea01fe664553ecc06 and fixed in 7.2-rc1 with commit e4b4984e28c16406ecb318444dea4a8bf47def3e 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-2026-72436 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/ipset/ip_set_hash_gen.h 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/c107233d2ff4fd7cef5d02f9124b99194957a710 https://git.kernel.org/stable/c/6329d3a9afe715fddda0460cfa46b496d61c2fe0 https://git.kernel.org/stable/c/7445fe965b7d8756070a40e80f8b73348ccda1d7 https://git.kernel.org/stable/c/c4d257734e91bfcdc71d41843392dd6400b5bb1b https://git.kernel.org/stable/c/3219d74e4536658c937fd878a327257b86ce80dd https://git.kernel.org/stable/c/e4b4984e28c16406ecb318444dea4a8bf47def3e