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Review reviewHigh

CVE-2025-40067

Linux

In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: reject index allocation if $BITMAP is empty but blocks exist Index allocation requires at least one bit in the $BITMAP attribute to track usage of index entries. If the bitmap is empty while index blocks are already present, this reflects on-disk corruption. syzbot triggered this condition using a malformed NTFS image. During a rename() operation involving a long filename (which spans multiple index entries), the empty bitmap allowed the name to be added without valid tracking. Subsequent deletion of the original...

CVSS
7.8
EPSS
0.15%
5.10% percentile
CISA KEV
Not listed
Published
2025.10.28
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.15%
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: reject index allocation if $BITMAP is empty but blocks exist Index allocation requires at least one bit in the $BITMAP attribute to track usage of index entries. If the bitmap is empty while index blocks are already present, this reflects on-disk corruption. syzbot triggered this condition using a malformed NTFS image. During a rename() operation involving a long filename (which spans multiple index entries), the empty bitmap allowed the name to be added without valid tracking. Subsequent deletion of the original...

Affected product and versions

Product
Linux
Affected versions
>= b35a50d639ca5259466ef5fea85529bb4fb17d5b < 978aac54e93ea35aab20b32ae393d3d33964e7ae, >= 3ed2cc6a6e93fbeb8c0cafce1e7fb1f64a331dcc < be66551da203862c689c12e1d35ce87217c017c1, >= d99208b91933fd2a58ed9ed321af07dacd06ddc3 < 039ddf353cc33f6546a87ec1ac3210637d714bec, >= d99208b91933fd2a58ed9ed321af07dacd06ddc3 < 0dc7117da8f92dd5fe077d712a756eccbe377d40, >= 358d4f821c03add421a4c49290538a705852ccf1, >= a285395020780adac1ffbc844069c3d700bf007a, >= 6.6.102 < 6.6.112, >= 6.12.42 < 6.12.53, >= 6.15.10 < 6.16, >= 6.16.1 < 6.17, >= 6.17
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE
Not available