CVE-2025-71067

Not scored yetLast modified Jun 17, 2026

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]

Metrics

No CVSS score has been published yet.

Affected software

VendorProductVersions
LinuxLinux>= 28861e3bbd9e7ac4cd9c811aad71b4d116e27930, < 0c9327c8abf9c8f046e45008bb43d94d8ee5c6c5; >= 28861e3bbd9e7ac4cd9c811aad71b4d116e27930, < 44a38eb4f7876513db5a1bccde74de9bc4389d43; >= 28861e3bbd9e7ac4cd9c811aad71b4d116e27930, < 4fff9a625da958a33191c8553a03283786f9f417; >= 28861e3bbd9e7ac4cd9c811aad71b4d116e27930, < b3c151fe8f543f1a0b8b5df16ce5d97afa5ec85a; >= 28861e3bbd9e7ac4cd9c811aad71b4d116e27930, < d1693a7d5a38acf6424235a6070bcf5b186a360d
LinuxLinux5.15

References

Timeline

Published
Jan 13, 2026
Last modified
Jun 17, 2026
NVD status
Deferred

Related CVEs from 2025

CVE-2025-710687.8In the Linux kernel, the following vulnerability has been resolved: svcrdma: bound check rq_pages index in inline path svc_rdma_copy_inlinCVE-2025-71069In the Linux kernel, the following vulnerability has been resolved: f2fs: invalidate dentry cache on failed whiteout creation F2FS can mouCVE-2025-71077.5A vulnerability classified as critical has been found in SimStudioAI sim up to 0.1.17. Affected is the function handleLocalFile of the file CVE-2025-710707.8In the Linux kernel, the following vulnerability has been resolved: ublk: clean up user copy references on ublk server exit If a ublk servCVE-2025-710717.8In the Linux kernel, the following vulnerability has been resolved: iommu/mediatek: fix use-after-free on probe deferral The driver is droCVE-2025-710725.5In the Linux kernel, the following vulnerability has been resolved: shmem: fix recovery on rename failures maple_tree insertions can fail CVE-2025-710737.8In the Linux kernel, the following vulnerability has been resolved: Input: lkkbd - disable pending work before freeing device lkkbd_interrCVE-2025-710744.7In the Linux kernel, the following vulnerability has been resolved: functionfs: fix the open/removal races ffs_epfile_open() can race withCVE-2025-710757.8In the Linux kernel, the following vulnerability has been resolved: scsi: aic94xx: fix use-after-free in device removal path The asd_pci_rCVE-2025-710765.5In the Linux kernel, the following vulnerability has been resolved: drm/xe/oa: Limit num_syncs to prevent oversized allocations The OA opeCVE-2025-710775.5In the Linux kernel, the following vulnerability has been resolved: tpm: Cap the number of PCR banks tpm2_get_pcr_allocation() does not caCVE-2025-710787.8In the Linux kernel, the following vulnerability has been resolved: powerpc/64s/slb: Fix SLB multihit issue during SLB preload On systems
CVE-2025-71067: Unscored | Vulnix