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 643E637E2E7 for ; Sat, 15 Aug 2026 06:29:54 +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=1786775395; cv=none; b=ZE9qgZn+ml9hh39uyJo16urAjW5/VhSTC9VKHwmqr+9QbUqFamBJ911dsCSFRJzcQDD3XccMdovC48bWwZ4khOAruv4WhM+O9lwZT2B2JVDamIX3fTMXTkWAvkaIAbF6skAE4E0Kkh/7ezdpoas/LSVHSzE3PTfo27nnVG+6cgk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786775395; c=relaxed/simple; bh=Kq59hCz7evYe3e4EWSK4t07mqx5IhCi4l9xIAjzHaSM=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=cUTgLfmDA+g3kBEvTqDMh/S2gOhZ1E3erj36fAV38WvTN1Vs6Y2QXnAa08Qrhr0t/6ZsEZ3+mdOzVAJeN5dU9MX2p0jGNdE3DZ0lwMEVLAqQ+aUc5QdG0XrOsBIk/MZx1w1dGIrq0FcxrQvJWnmXkSYaDeCBAreMYJt4qeTuyk0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=xxgpWumO; 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="xxgpWumO" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B6EB61F000E9; Sat, 15 Aug 2026 06:29:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1786775394; bh=oRsR6DiHWiML8f3ag+thTRXJbupO0rCrUuKnAUlNvCA=; h=From:To:Cc:Subject:Date:Reply-To; b=xxgpWumO/ve6zvlvyfh16LJColwqGQF8BSUcP5xcnLCFwQM+wL7//2Mxe6TytUQdc VxRg2kTP7zV2Pai7qiSMzRPjzXBOs+JwzaMl34jDLv6eL9+Iy7FeO3DE9IwnAoGbsI gqali79Kfh/E7A+wW4QXbg9HCTpXQLCbmagwQ3qU= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-72471: fs/ntfs3: prevent potential lcn remains uninitialized Date: Sat, 15 Aug 2026 15:09:10 +0900 Message-ID: <2026081535-CVE-2026-72471-5abe@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=2505; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=IyY95ovpoJLf8405rj/vH8VznLg1XB/c6u4g1KDHETc=; b=owGbwMvMwCRo6H6F97bub03G02pJDFkNDL/tV8x6cNXp7kfRtgv/M5ive64WsQg2u67z4vrPl tQyiV7jjlgWBkEmBlkxRZYv23iO7q84pOhlaHsaZg4rE8gQBi5OAZiIZSTDPGu3SY7XFQ8cXFCa ENN488qqxdYa0xjmexbuFe+W9sl2kE/dd7K9TZRVfuksAA== 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: fs/ntfs3: prevent potential lcn remains uninitialized The target VCN being sought was not found within runs[0], causing run_lookup() to return false. This causes run_lookup_entry() to return false, which in turn results in a len value of 0, and the new parameter passed to attr_data_get_block() is NULL. Collectively, these factors ultimately cause attr_data_get_block_locked() to exit prematurely without initializing lcn, thereby triggering [1]. To prevent [1], the clen check within ni_seek_data_or_hole() has been moved to occur before the lcn check. [1] BUG: KMSAN: uninit-value in ni_seek_data_or_hole+0x24f/0x5f0 fs/ntfs3/frecord.c:2862 ni_seek_data_or_hole+0x24f/0x5f0 fs/ntfs3/frecord.c:2862 ntfs_llseek+0x22a/0x4a0 fs/ntfs3/file.c:1530 vfs_llseek fs/read_write.c:391 [inline] The Linux kernel CVE team has assigned CVE-2026-72471 to this issue. Affected and fixed versions =========================== Issue introduced in 7.0 with commit c61326967728392931f8a2240cb2cf4c81b523c1 and fixed in 7.1.5 with commit 7ae7e98b71438c494532492cbf58fc0d7f7988bb Issue introduced in 7.0 with commit c61326967728392931f8a2240cb2cf4c81b523c1 and fixed in 7.2-rc1 with commit 57ac2831c8e0f168090d38e3de758c6a59db44db 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-2026-72471 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: fs/ntfs3/frecord.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/7ae7e98b71438c494532492cbf58fc0d7f7988bb https://git.kernel.org/stable/c/57ac2831c8e0f168090d38e3de758c6a59db44db