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Message-ID: <2025102818-CVE-2025-40068-1b0e@gregkh> Date: Tue, 28 Oct 2025 12:48:45 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...nel.org> Subject: CVE-2025-40068: fs: ntfs3: Fix integer overflow in run_unpack() From: Greg Kroah-Hartman <gregkh@...nel.org> Description =========== In the Linux kernel, the following vulnerability has been resolved: fs: ntfs3: Fix integer overflow in run_unpack() The MFT record relative to the file being opened contains its runlist, an array containing information about the file's location on the physical disk. Analysis of all Call Stack paths showed that the values of the runlist array, from which LCNs are calculated, are not validated before run_unpack function. The run_unpack function decodes the compressed runlist data format from MFT attributes (for example, $DATA), converting them into a runs_tree structure, which describes the mapping of virtual clusters (VCN) to logical clusters (LCN). The NTFS3 subsystem also has a shortcut for deleting files from MFT records - in this case, the RUN_DEALLOCATE command is sent to the run_unpack input, and the function logic provides that all data transferred to the runlist about file or directory is deleted without creating a runs_tree structure. Substituting the runlist in the $DATA attribute of the MFT record for an arbitrary file can lead either to access to arbitrary data on the disk bypassing access checks to them (since the inode access check occurs above) or to destruction of arbitrary data on the disk. Add overflow check for addition operation. Found by Linux Verification Center (linuxtesting.org) with SVACE. The Linux kernel CVE team has assigned CVE-2025-40068 to this issue. Affected and fixed versions =========================== Issue introduced in 5.15 with commit 4342306f0f0d5ff4315a204d315c1b51b914fca5 and fixed in 5.15.195 with commit f6b36cfd25cbadad63447c673743cf771090e756 Issue introduced in 5.15 with commit 4342306f0f0d5ff4315a204d315c1b51b914fca5 and fixed in 6.1.156 with commit 3ac37e100385b59ac821a62118494442238aaac4 Issue introduced in 5.15 with commit 4342306f0f0d5ff4315a204d315c1b51b914fca5 and fixed in 6.6.112 with commit a86c8b9d03f7101e1750233846fe989df6f0d631 Issue introduced in 5.15 with commit 4342306f0f0d5ff4315a204d315c1b51b914fca5 and fixed in 6.12.53 with commit 9378cfe228c2c679564a4116bcb28c8e89dff989 Issue introduced in 5.15 with commit 4342306f0f0d5ff4315a204d315c1b51b914fca5 and fixed in 6.17.3 with commit 5aa5799d162ad1b8e8b699d48b6218143c695a78 Issue introduced in 5.15 with commit 4342306f0f0d5ff4315a204d315c1b51b914fca5 and fixed in 6.18-rc1 with commit 736fc7bf5f68f6b74a0925b7e072c571838657d2 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-2025-40068 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/run.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/f6b36cfd25cbadad63447c673743cf771090e756 https://git.kernel.org/stable/c/3ac37e100385b59ac821a62118494442238aaac4 https://git.kernel.org/stable/c/a86c8b9d03f7101e1750233846fe989df6f0d631 https://git.kernel.org/stable/c/9378cfe228c2c679564a4116bcb28c8e89dff989 https://git.kernel.org/stable/c/5aa5799d162ad1b8e8b699d48b6218143c695a78 https://git.kernel.org/stable/c/736fc7bf5f68f6b74a0925b7e072c571838657d2
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