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Review reviewHigh

CVE-2026-64533

Linux

In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: validate lcns_follow in log_replay conversion log_replay() converts DIR_PAGE_ENTRY_32 records into DIR_PAGE_ENTRY records when replaying version 0 restart tables. During this conversion, the memmove() length is derived directly from the on-disk lcns_follow field: memmove(&dp->vcn, &dp0->vcn_low, 2 * sizeof(u64) + le32_to_cpu(dp->lcns_follow) * sizeof(u64)); check_rstbl() validates restart table structure, but does not constrain per-entry lcns_follow values relative to the entry size. A malformed filesystem image c...

CVSS
7.8
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.07.27
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: validate lcns_follow in log_replay conversion log_replay() converts DIR_PAGE_ENTRY_32 records into DIR_PAGE_ENTRY records when replaying version 0 restart tables. During this conversion, the memmove() length is derived directly from the on-disk lcns_follow field: memmove(&dp->vcn, &dp0->vcn_low, 2 * sizeof(u64) + le32_to_cpu(dp->lcns_follow) * sizeof(u64)); check_rstbl() validates restart table structure, but does not constrain per-entry lcns_follow values relative to the entry size. A malformed filesystem image c...

Affected product and versions

Product
Linux
Affected versions
>= b46acd6a6a627d876898e1c84d3f84902264b445 < ca343a99806b4fc8e27c48f08be3445c5fcd1445, >= b46acd6a6a627d876898e1c84d3f84902264b445 < ddfc8683e1a627dbf1b83bacf8961443dd654258, >= b46acd6a6a627d876898e1c84d3f84902264b445 < 57c071e2c4f30b9c6f5aacb6679aab1269fbae99, >= b46acd6a6a627d876898e1c84d3f84902264b445 < 159f694d682e4215b3822ae31ed3a4631628fe55, >= b46acd6a6a627d876898e1c84d3f84902264b445 < 7adb38279812c9c06b0e3fa7382f4d7887f3fa2d, >= b46acd6a6a627d876898e1c84d3f84902264b445 < 32b9f8733feb241627fa5f564b1a99b5cae974c5, >= b46acd6a6a627d876898e1c84d3f84902264b445 < 6a4c53a2e26a865565bd6a460961e8d6fcb32329, >= 5.15
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