# CVE-2025-71067: ntfs: set dummy blocksize to read boot_block when mounting

CVE-2025-71067 is fixed in 45 products on 1 platform, first by DEBIAN-CVE-2025-71067, released January 13, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2025-71067
- Priority: High
- CVSS: 7.1 (Important)
- EPSS: 0.0020
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jan 13, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-71067

## Description

In the Linux kernel, the following vulnerability has been resolved:  ntfs: set dummy blocksize to read boot_block when mounting  When mounting, sb->s_blocksize is used to read the boot_block without being defined or validated. Set a dummy blocksize before attempting to read the boot_block.  The issue can be triggered with the following syz reproducer:    mkdirat(0xffffffffffffff9c, &(0x7f0000000080)='./file1\x00', 0x0)   r4 = openat$nullb(0xffffffffffffff9c, &(0x7f0000000040), 0x121403, 0x0)   ioctl$FS_IOC_SETFLAGS(r4, 0x40081271, &(0x7f0000000980)=0x4000)   mount(&(0x7f0000000140)=@nullb, &(0x7f0000000040)='./cgroup\x00',         &(0x7f0000000000)='ntfs3\x00', 0x2208004, 0x0)   syz_clone(0x88200200, 0x0, 0x0, 0x0, 0x0, 0x0)  Here, the ioctl sets the bdev block size to 16384. During mount, get_tree_bdev_flags() calls sb_set_blocksize(sb, block_size(bdev)), but since block_size(bdev) > PAGE_SIZE, sb_set_blocksize() leaves sb->s_blocksize at zero.  Later, ntfs_init_from_boot() attempts to read the boot_block while sb->s_blocksize is still zero, which triggers the bug.  [almaz.alexandrovich@paragon-software.com: changed comment style, added return value handling]

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | bpftool amzn 2023 | 1:6.1.168-202.320.amzn2023 | [ALAS2023-2026-1681](https://patchblox.com/security/data/fix/linux/alas2023-2026-1681.md) | May 11, 2026 |
| Linux | bpftool-debuginfo amzn 2023 | 1:6.1.168-202.320.amzn2023 | [ALAS2023-2026-1681](https://patchblox.com/security/data/fix/linux/alas2023-2026-1681.md) | May 11, 2026 |
| Linux | bpftool6.12 amzn 2023 | 1:6.12.64-87.122.amzn2023 | [ALAS2023-2026-1423](https://patchblox.com/security/data/fix/linux/alas2023-2026-1423.md) | Feb 5, 2026 |
| Linux | bpftool6.12-debuginfo amzn 2023 | 1:6.12.64-87.122.amzn2023 | [ALAS2023-2026-1423](https://patchblox.com/security/data/fix/linux/alas2023-2026-1423.md) | Feb 5, 2026 |
| Linux | kernel amzn 2023 | 1:6.1.168-202.320.amzn2023 | [ALAS2023-2026-1681](https://patchblox.com/security/data/fix/linux/alas2023-2026-1681.md) | May 11, 2026 |
| Linux | kernel-debuginfo amzn 2023 | 1:6.1.168-202.320.amzn2023 | [ALAS2023-2026-1681](https://patchblox.com/security/data/fix/linux/alas2023-2026-1681.md) | May 11, 2026 |
| Linux | kernel-debuginfo-common-aarch64 amzn 2023 | 1:6.1.168-202.320.amzn2023 | [ALAS2023-2026-1681](https://patchblox.com/security/data/fix/linux/alas2023-2026-1681.md) | May 11, 2026 |
| Linux | kernel-debuginfo-common-x86_64 amzn 2023 | 1:6.1.168-202.320.amzn2023 | [ALAS2023-2026-1681](https://patchblox.com/security/data/fix/linux/alas2023-2026-1681.md) | May 11, 2026 |
| Linux | kernel-devel amzn 2023 | 1:6.1.168-202.320.amzn2023 | [ALAS2023-2026-1681](https://patchblox.com/security/data/fix/linux/alas2023-2026-1681.md) | May 11, 2026 |
| Linux | kernel-headers amzn 2023 | 1:6.1.168-202.320.amzn2023 | [ALAS2023-2026-1681](https://patchblox.com/security/data/fix/linux/alas2023-2026-1681.md) | May 11, 2026 |
| Linux | kernel-libbpf amzn 2023 | 1:6.1.168-202.320.amzn2023 | [ALAS2023-2026-1681](https://patchblox.com/security/data/fix/linux/alas2023-2026-1681.md) | May 11, 2026 |
| Linux | kernel-libbpf-debuginfo amzn 2023 | 1:6.1.168-202.320.amzn2023 | [ALAS2023-2026-1681](https://patchblox.com/security/data/fix/linux/alas2023-2026-1681.md) | May 11, 2026 |
| Linux | kernel-libbpf-devel amzn 2023 | 1:6.1.168-202.320.amzn2023 | [ALAS2023-2026-1681](https://patchblox.com/security/data/fix/linux/alas2023-2026-1681.md) | May 11, 2026 |
| Linux | kernel-libbpf-static amzn 2023 | 1:6.1.168-202.320.amzn2023 | [ALAS2023-2026-1681](https://patchblox.com/security/data/fix/linux/alas2023-2026-1681.md) | May 11, 2026 |
| Linux | kernel-livepatch-6.1.168-202.320 amzn 2023 | 1:1.0-0.amzn2023 | [ALAS2023-2026-1681](https://patchblox.com/security/data/fix/linux/alas2023-2026-1681.md) | May 11, 2026 |
| Linux | kernel-livepatch-6.12.64-87.122 amzn 2023 | 1:1.0-0.amzn2023 | [ALAS2023-2026-1423](https://patchblox.com/security/data/fix/linux/alas2023-2026-1423.md) | Feb 5, 2026 |
| Linux | kernel-modules-extra amzn 2023 | 1:6.1.168-202.320.amzn2023 | [ALAS2023-2026-1681](https://patchblox.com/security/data/fix/linux/alas2023-2026-1681.md) | May 11, 2026 |
| Linux | kernel-modules-extra-common amzn 2023 | 1:6.1.168-202.320.amzn2023 | [ALAS2023-2026-1681](https://patchblox.com/security/data/fix/linux/alas2023-2026-1681.md) | May 11, 2026 |
| Linux | kernel-tools amzn 2023 | 1:6.1.168-202.320.amzn2023 | [ALAS2023-2026-1681](https://patchblox.com/security/data/fix/linux/alas2023-2026-1681.md) | May 11, 2026 |
| Linux | kernel-tools-debuginfo amzn 2023 | 1:6.1.168-202.320.amzn2023 | [ALAS2023-2026-1681](https://patchblox.com/security/data/fix/linux/alas2023-2026-1681.md) | May 11, 2026 |
| Linux | kernel-tools-devel amzn 2023 | 1:6.1.168-202.320.amzn2023 | [ALAS2023-2026-1681](https://patchblox.com/security/data/fix/linux/alas2023-2026-1681.md) | May 11, 2026 |
| Linux | kernel6.12 amzn 2023 | 1:6.12.64-87.122.amzn2023 | [ALAS2023-2026-1423](https://patchblox.com/security/data/fix/linux/alas2023-2026-1423.md) | Feb 5, 2026 |
| Linux | kernel6.12-debuginfo amzn 2023 | 1:6.12.64-87.122.amzn2023 | [ALAS2023-2026-1423](https://patchblox.com/security/data/fix/linux/alas2023-2026-1423.md) | Feb 5, 2026 |
| Linux | kernel6.12-debuginfo-common-aarch64 amzn 2023 | 1:6.12.64-87.122.amzn2023 | [ALAS2023-2026-1423](https://patchblox.com/security/data/fix/linux/alas2023-2026-1423.md) | Feb 5, 2026 |
| Linux | kernel6.12-debuginfo-common-x86_64 amzn 2023 | 1:6.12.64-87.122.amzn2023 | [ALAS2023-2026-1423](https://patchblox.com/security/data/fix/linux/alas2023-2026-1423.md) | Feb 5, 2026 |
| Linux | kernel6.12-devel amzn 2023 | 1:6.12.64-87.122.amzn2023 | [ALAS2023-2026-1423](https://patchblox.com/security/data/fix/linux/alas2023-2026-1423.md) | Feb 5, 2026 |
| Linux | kernel6.12-headers amzn 2023 | 1:6.12.64-87.122.amzn2023 | [ALAS2023-2026-1423](https://patchblox.com/security/data/fix/linux/alas2023-2026-1423.md) | Feb 5, 2026 |
| Linux | kernel6.12-libbpf amzn 2023 | 1:6.12.64-87.122.amzn2023 | [ALAS2023-2026-1423](https://patchblox.com/security/data/fix/linux/alas2023-2026-1423.md) | Feb 5, 2026 |
| Linux | kernel6.12-libbpf-debuginfo amzn 2023 | 1:6.12.64-87.122.amzn2023 | [ALAS2023-2026-1423](https://patchblox.com/security/data/fix/linux/alas2023-2026-1423.md) | Feb 5, 2026 |
| Linux | kernel6.12-libbpf-devel amzn 2023 | 1:6.12.64-87.122.amzn2023 | [ALAS2023-2026-1423](https://patchblox.com/security/data/fix/linux/alas2023-2026-1423.md) | Feb 5, 2026 |
| Linux | kernel6.12-libbpf-static amzn 2023 | 1:6.12.64-87.122.amzn2023 | [ALAS2023-2026-1423](https://patchblox.com/security/data/fix/linux/alas2023-2026-1423.md) | Feb 5, 2026 |
| Linux | kernel6.12-modules-extra amzn 2023 | 1:6.12.64-87.122.amzn2023 | [ALAS2023-2026-1423](https://patchblox.com/security/data/fix/linux/alas2023-2026-1423.md) | Feb 5, 2026 |
| Linux | kernel6.12-modules-extra-common amzn 2023 | 1:6.12.64-87.122.amzn2023 | [ALAS2023-2026-1423](https://patchblox.com/security/data/fix/linux/alas2023-2026-1423.md) | Feb 5, 2026 |
| Linux | kernel6.12-tools amzn 2023 | 1:6.12.64-87.122.amzn2023 | [ALAS2023-2026-1423](https://patchblox.com/security/data/fix/linux/alas2023-2026-1423.md) | Feb 5, 2026 |
| Linux | kernel6.12-tools-debuginfo amzn 2023 | 1:6.12.64-87.122.amzn2023 | [ALAS2023-2026-1423](https://patchblox.com/security/data/fix/linux/alas2023-2026-1423.md) | Feb 5, 2026 |
| Linux | kernel6.12-tools-devel amzn 2023 | 1:6.12.64-87.122.amzn2023 | [ALAS2023-2026-1423](https://patchblox.com/security/data/fix/linux/alas2023-2026-1423.md) | Feb 5, 2026 |
| Linux | linux Debian 12.15 (bookworm) | 6.1.170-1 | [DEBIAN-CVE-2025-71067](https://patchblox.com/security/data/fix/linux/debian-cve-2025-71067.md) | Jan 13, 2026 |
| Linux | linux Debian 13.5 (trixie) | 6.12.69-1 | [DEBIAN-CVE-2025-71067](https://patchblox.com/security/data/fix/linux/debian-cve-2025-71067.md) | Jan 13, 2026 |
| Linux | linux Debian 14 | 6.18.3-1 | [DEBIAN-CVE-2025-71067](https://patchblox.com/security/data/fix/linux/debian-cve-2025-71067.md) | Jan 13, 2026 |
| Linux | perf amzn 2023 | 1:6.1.168-202.320.amzn2023 | [ALAS2023-2026-1681](https://patchblox.com/security/data/fix/linux/alas2023-2026-1681.md) | May 11, 2026 |
| Linux | perf-debuginfo amzn 2023 | 1:6.1.168-202.320.amzn2023 | [ALAS2023-2026-1681](https://patchblox.com/security/data/fix/linux/alas2023-2026-1681.md) | May 11, 2026 |
| Linux | perf6.12 amzn 2023 | 1:6.12.64-87.122.amzn2023 | [ALAS2023-2026-1423](https://patchblox.com/security/data/fix/linux/alas2023-2026-1423.md) | Feb 5, 2026 |
| Linux | perf6.12-debuginfo amzn 2023 | 1:6.12.64-87.122.amzn2023 | [ALAS2023-2026-1423](https://patchblox.com/security/data/fix/linux/alas2023-2026-1423.md) | Feb 5, 2026 |
| Linux | python3-perf amzn 2023 | 1:6.1.168-202.320.amzn2023 | [ALAS2023-2026-1681](https://patchblox.com/security/data/fix/linux/alas2023-2026-1681.md) | May 11, 2026 |
| Linux | python3-perf-debuginfo amzn 2023 | 1:6.1.168-202.320.amzn2023 | [ALAS2023-2026-1681](https://patchblox.com/security/data/fix/linux/alas2023-2026-1681.md) | May 11, 2026 |
| Linux | python3-perf6.12 amzn 2023 | 1:6.12.64-87.122.amzn2023 | [ALAS2023-2026-1423](https://patchblox.com/security/data/fix/linux/alas2023-2026-1423.md) | Feb 5, 2026 |
| Linux | python3-perf6.12-debuginfo amzn 2023 | 1:6.12.64-87.122.amzn2023 | [ALAS2023-2026-1423](https://patchblox.com/security/data/fix/linux/alas2023-2026-1423.md) | Feb 5, 2026 |

---

Data as of 2026-11-07T18:46:35Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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