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 3F5695867E7 for ; Fri, 11 Sep 2026 19:58:44 +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=1789156735; cv=none; b=aT64+041bTUwLCItHp/szVrUWcLmJkOX4j3LqDQ80NMokOdyQj/daEiaag3/PyPTgZXjhPjbOxYu5m00h7xpXGaRWUxGnQdpuOaXIO2/wOs4scEqGqq+4KhNbm2vDs0OBQkQw5S1ZNTm66wxoYLXHYTAZfAqR5f4dLxna2qvH9U= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789156735; c=relaxed/simple; bh=RSI2/mKLOBwfVOyOw1pjoqhAlIlERcAUwAIXLCrzhy8=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=A8fKvnZ10AwGboy4Oupd5E2b/joIiJXFlyG+aQHsfMPv5J00BP735e/9OyMvdxXntfrS2ZDE8b5PmVtjgvAkTTxZxR9VtFefS1ygkR1J9Qk13SfrfgrQV9NspL1NJToTtJEu916UA5vUrGWeWJM0dRYyPdJ7DBVRv0nNbhlJkrM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=qtlDrPv7; 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="qtlDrPv7" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 36AE01F000FF; Fri, 11 Sep 2026 19:58:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789156720; bh=3hy2FhHxYSchQ/giMx3TXMzkJrbkUGlKVjROYrom/h0=; h=From:To:Cc:Subject:Date:Reply-To; b=qtlDrPv71Ve0qfFDA2uqBKQBf6o2Dhx8pALHgWYrIUHK3PAzkmYfz1b7Gnruwv/rf Ti6peh/du6ivopDnjX9BNnWEkrVa+2sAdY6VwZhapN89Efjq/j9pPypH+kla4S2EBl P82lIzBW19/nJ/uldOUofb3M4SmzICPPQXDBcUe8= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-89611: ntfs: validate non-resident attribute offsets Date: Fri, 11 Sep 2026 21:45:00 +0200 Message-ID: <2026091135-CVE-2026-89611-2a16@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=2742; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=dR8mRIjrYU6yfsRVuYRRqHwMzJyRir81hNeKCzW7L0Y=; b=owGbwMvMwCRo6H6F97bub03G02pJDFlLIvNjNvG84pmx51VZhoN8+NPtz9g8Tts8K2+5x2ShE nx6vYJ2RywLgyATg6yYIsuXbTxH91ccUvQytD0NM4eVCWQIAxenAEzE34BhvnPnc9W6RYUGNxoN f7OKl3CyWkeYMcx3faDAHfgj9v7NhJJ3Rw9MTzopevwEAA== 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: ntfs: validate non-resident attribute offsets ntfs_attr_update_meta() shifts the attribute name when converting between non-sparse and sparse attributes. Converting to sparse also adds the compressed_size field before the name and mapping pairs, requiring eight additional bytes in the attribute record. However, the validator does not check that name_offset is within safe boundaries for these operations or that the additional space is available. A malicious MFT record could set name_offset such that: 1. The name is positioned at the very end of a non-sparse attribute. Converting to sparse would shift the name forward by 8 bytes, writing beyond the attribute boundary. 2. The name overlaps with the mapping pairs, causing corruption during conversion. Add validation to ensure: - For named attributes, name_offset is within valid bounds - Name does not extend beyond the attribute or overlap with mapping pairs - For non-sparse, non-compressed attributes, eight bytes are available after mapping_pairs_offset for the compressed_size field The space check also covers unnamed attributes, for which name_offset = 0 is valid and no name range needs to be checked. The Linux kernel CVE team has assigned CVE-2026-89611 to this issue. Affected and fixed versions =========================== Fixed in 7.2.4 with commit cd7b3dc7557faadeea626034e3bac68a449851ef Fixed in 7.3-rc1 with commit a83e82b0ec3ae523028e24813f23f18b43e8fc1c 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-2026-89611 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/ntfs/attrib.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/cd7b3dc7557faadeea626034e3bac68a449851ef https://git.kernel.org/stable/c/a83e82b0ec3ae523028e24813f23f18b43e8fc1c