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CVE-2026-64432 (GCVE-0-2026-64432)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:51 – Updated: 2026-08-17 04:55
VLAI
Title
fs/ntfs3: validate Dirty Page Table capacity in log_replay copy_lcns
Summary
In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: validate Dirty Page Table capacity in log_replay copy_lcns In the analysis pass of $LogFile journal replay, log_replay() copies LCNs from each action log record into an existing Dirty Page Table (DPT) entry without bounding the destination index. A crafted NTFS image with DPT entry lcns_follow=1 and an action log record with lcns_follow=2 produces a kernel slab out-of-bounds write at mount time: BUG: KASAN: slab-out-of-bounds in log_replay+0x654c/0xdb60 Write of size 8 at addr ffff8880095e1040 by task mount Two attacker-controlled fields can drive j+i past the allocated page_lcns[] array: 1. dp->lcns_follow (capacity) can be smaller than lrh->lcns_follow. 2. lrh->target_vcn may be smaller than dp->vcn, making the u64 subtraction wrap to a huge size_t. Validate target VCN delta and per-record LCN count against the DPT entry capacity, bail via the existing out: cleanup label with -EINVAL. This mirrors the bounds-check pattern added in commit b2bc7c44ed17 ("fs/ntfs3: Fix slab-out-of-bounds read in DeleteIndexEntryRoot") and commit 0ca0485e4b2e ("fs/ntfs3: validate rec->used in journal-replay file record check").
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < 964c3fae1dfc49dde5468eace940f199cda234e9 (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < 3aa96956ca2200674e2a8f9c23ec6ecd45e5010f (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < 946046841013ebac8492ef49651c53638d7a9a6a (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < c6f9e804f73ef809529865fbc7256dd189ff8c33 (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < cf28fc1658463d768657cf1c27a83980d4ba7ef2 (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < f433acc85b86f327d03ba8b03a33c105c51053de (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < 57382ec6ac63b63dce2789e835fded28b698ae79 (git)
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Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.96 , ≤ 6.12.* (semver)
Unaffected: 6.18.39 , ≤ 6.18.* (semver)
Unaffected: 7.1.4 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: validate Dirty Page Table capacity in log_replay copy_lcns\n\nIn the analysis pass of $LogFile journal replay, log_replay() copies\nLCNs from each action log record into an existing Dirty Page Table\n(DPT) entry without bounding the destination index. A crafted NTFS\nimage with DPT entry lcns_follow=1 and an action log record with\nlcns_follow=2 produces a kernel slab out-of-bounds write at mount\ntime:\n\n  BUG: KASAN: slab-out-of-bounds in log_replay+0x654c/0xdb60\n  Write of size 8 at addr ffff8880095e1040 by task mount\n\nTwo attacker-controlled fields can drive j+i past the allocated\npage_lcns[] array:\n\n  1. dp-\u003elcns_follow (capacity) can be smaller than lrh-\u003elcns_follow.\n  2. lrh-\u003etarget_vcn may be smaller than dp-\u003evcn, making the u64\n     subtraction wrap to a huge size_t.\n\nValidate target VCN delta and per-record LCN count against the\nDPT entry capacity, bail via the existing out: cleanup label with\n-EINVAL.\n\nThis mirrors the bounds-check pattern added in commit b2bc7c44ed17\n(\"fs/ntfs3: Fix slab-out-of-bounds read in DeleteIndexEntryRoot\")\nand commit 0ca0485e4b2e (\"fs/ntfs3: validate rec-\u003eused in\njournal-replay file record check\")."
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A crafted NTFS\\nimage with DPT entry lcns_follow=1 and an action log record with\\nlcns_follow=2 produces a kernel slab out-of-bounds write at mount\\ntime:\\n\\n  BUG: KASAN: slab-out-of-bounds in log_replay+0x654c/0xdb60\\n  Write of size 8 at addr ffff8880095e1040 by task mount\\n\\nTwo attacker-controlled fields can drive j+i past the allocated\\npage_lcns[] array:\\n\\n  1. dp-\u003elcns_follow (capacity) can be smaller than lrh-\u003elcns_follow.\\n  2. lrh-\u003etarget_vcn may be smaller than dp-\u003evcn, making the u64\\n     subtraction wrap to a huge size_t.\\n\\nValidate target VCN delta and per-record LCN count against the\\nDPT entry capacity, bail via the existing out: cleanup label with\\n-EINVAL.\\n\\nThis mirrors the bounds-check pattern added in commit b2bc7c44ed17\\n(\\\"fs/ntfs3: Fix slab-out-of-bounds read in DeleteIndexEntryRoot\\\")\\nand commit 0ca0485e4b2e (\\\"fs/ntfs3: validate rec-\u003eused in\\njournal-replay file record 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    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-07-29T08:14:56+00:00",
      "cve": "CVE-2026-64432",
      "id": "CVE-2026-64432",
      "initial_release_date": "2026-07-25T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: fs/ntfs3: validate Dirty Page Table capacity in log_replay copy_lcns",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64432.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T01:48:57Z",
      "cve": "CVE-2026-64432",
      "id": "CVE-2026-64432",
      "initial_release_date": "2026-07-25T15:59:27Z",
      "product_status:known_affected": "125",
      "product_status:known_not_affected": "251",
      "product_status:recommended": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64432",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64432.json",
      "version": "7"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.