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

Deferred
AliasesUBUNTU-CVE-2025-71067DEBIAN-CVE-2025-71067
Published 13-01-2026Last modified 11-05-2026

Vulnerability summary

CVE-2025-71067 is a vulnerability in linux with no CVSS score yet. EPSS estimates a 0.20% chance of exploitation in the next 30 days, higher than 10.1% of scored vulnerabilities.

Priority
Insufficient evidence

No CVSS vector published; no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
Not scored
010
No CVSS score recorded
EPSS score
0.20%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 21 · Related 20
DSA-6126-1MGASA-2026-0017MGASA-2026-0018USN-8177-1USN-8177-2USN-8179-1

Timeline

  1. 13-01-2026
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

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]

CVSS metrics

Risk metrics not yet published.

EPSS trend

Probability

0.20%

Chance of exploitation in the next 30 days

Percentile

10%

Versus all other CVEs

30-day change

Increase +0.01 pp

From 0.20% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Version check

Known conditions: not stated in public data.

Ubuntu157 products
  • linuxAll versions (No fix recorded) | < 6.8.0-110.110 | < 6.17.0-22.22
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 6.8.0-1052.55 | < 6.17.0-1012.12
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian1 product
  • linux< 6.1.170-1 | < 6.12.69-1 | < 6.18.3-1
Linux1 product
  • linux≥ 28861e3bbd9e7ac4cd9c811aad71b4d116e27930, < 0c9327c8abf9c8f046e45008bb43d94d8ee5c6c5 | ≥ 28861e3bbd9e7ac4cd9c811aad71b4d116e27930, < 44a38eb4f7876513db5a1bccde74de9bc4389d43 | ≥ 28861e3bbd9e7ac4cd9c811aad71b4d116e27930, < 4fff9a625da958a33191c8553a03283786f9f417 | ≥ 28861e3bbd9e7ac4cd9c811aad71b4d116e27930, < b3c151fe8f543f1a0b8b5df16ce5d97afa5ec85a | ≥ 28861e3bbd9e7ac4cd9c811aad71b4d116e27930, < d1693a7d5a38acf6424235a6070bcf5b186a360d | 5.15

3 vendors · 159 products

References

29 links
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