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 82343361958 for ; Sat, 15 Aug 2026 06:16:12 +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=1786774573; cv=none; b=MvSVgFOjIQcsDTfPJeCi3jgA5Kg9sQMD12hnLHvGuN2hFJ8kOncEpcS17hJaAGZz9Nm+ujOsul7TIF4bQcCr7edIVSR9oxQVRhdWzOXrLUL9aDDsSH5+NSxZpTzMUgZ5uiN7XEqpxU2Eyvz6taemib4aBQFtSIJtfhGBxsHmYvk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786774573; c=relaxed/simple; bh=D4ViPigefrQpg/ioP3tlRjCsAg47kfoXbWzKkvp5D8c=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=qdc3SXrvo6DZJMF7uJ7atXz7gDOvQ+IdEOYOnKkvjwc2nwELTot/lLPzwguGEORN+CXJ7tbJREXToE4clmCKghZijvqVP7vxpCEOGzfWh1SNg6adgGvkSV+QuDC+jSENhKr2qXmJ/rX5YwW2MSR2HJYMB5zR9U32cqh7DVXs60Y= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=LGgSzf4Y; 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="LGgSzf4Y" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 78E9A1F000E9; Sat, 15 Aug 2026 06:16:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1786774572; bh=IQK8z5Nlq4hpuPDfwBAtQQrVSNXTP4qCSezPecUTfOg=; h=From:To:Cc:Subject:Date:Reply-To; b=LGgSzf4Yu/GgY8KiHGijSnoe0xj2uyemKwywHOBZxSkO70fw0FM3ZznuKDW2GcBaZ 1ZDyTLszCMeCZ5q2RDMlJmknAToabyWPZXjLnCr2J8hbg1ppAeMrwDxNwvzkRboRIF McWsYOlDzVj1JWTva9p0akXDY0TlbYaqfkL+55XU= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-72199: ntfs: validate resident index root values on lookup Date: Sat, 15 Aug 2026 15:04:38 +0900 Message-ID: <2026081543-CVE-2026-72199-90e2@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=2802; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=YtiTPxR10QzOnaz1s4LROIP16fUwimG5oYBJyPa0vEQ=; b=owGbwMvMwCRo6H6F97bub03G02pJDFkNDMdvnL7YveEvb9WZmMtPputyJvYfZVi7V9SS5b4T7 7yFu85N6YhlYRBkYpAVU2T5so3n6P6KQ4pehranYeawMoEMYeDiFICJmB1imKeh2PXn2Zfp1jtv Lnzj/zO1wX5Hry7Dgl05LpUmPO9NN22PC33j+STw7nknPQA= 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 resident index root values on lookup Resident $INDEX_ROOT values carry index header fields that callers consume after lookup. Some callers already validate parts of the layout before walking entries, but those checks are scattered and do not cover all root header invariants, such as entries_offset alignment and lower bound, index_length, and allocated_size consistency. The resident root resize paths now keep these header fields consistent while the value size changes: ntfs_ir_truncate() lowers index.allocated_size before shrinking the resident value, and ntfs_ir_reparent() grows the resident value before publishing a larger root header. Lookup-time validation can therefore cover these invariants without tripping over the driver's own resize paths. Add $INDEX_ROOT to the minimum resident value size table and validate the resident index header fields before returning the attribute from lookup. Require 8-byte aligned index header fields, a sane entries_offset, an index_length within allocated_size, allocated_size within the resident value, and enough entry space for at least an index entry header. The shared validator already rejects non-resident records for resident-only attribute types, including $INDEX_ROOT. The Linux kernel CVE team has assigned CVE-2026-72199 to this issue. Affected and fixed versions =========================== Fixed in 7.1.5 with commit bfb01dd319b6b4c3e79756de7b75ccf0b9a0a247 Fixed in 7.2-rc1 with commit fcf5bf0e8570798970e3ae8c95d04765ba2c5b97 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-2026-72199 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/bfb01dd319b6b4c3e79756de7b75ccf0b9a0a247 https://git.kernel.org/stable/c/fcf5bf0e8570798970e3ae8c95d04765ba2c5b97