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CVE-2026-74570 (GCVE-0-2026-74570)

Vulnerability from cvelistv5 – Published: 2026-08-15 12:28 – Updated: 2026-08-17 05:48
VLAI
Title
ntfs: harden runlist realloc size calculations
Summary
In the Linux kernel, the following vulnerability has been resolved: ntfs: harden runlist realloc size calculations Add a shared helper to safely convert runlist element counts to byte sizes using overflow checks, and use it in both ntfs_rl_realloc() and ntfs_rl_realloc_nofail().
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 11ccc9107dc460de28af90fac1f42404d9802735 , < 57e7b8bf7b02a0140463fea786e5172cbdf2da2f (git)
Affected: 11ccc9107dc460de28af90fac1f42404d9802735 , < 8bed376124ab4505b70083a2b91f2c7ef6d51e24 (git)
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Linux Linux Affected: 7.1
Unaffected: 0 , < 7.1 (semver)
Unaffected: 7.1.8 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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          "programFiles": [
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              "value": "AV:N - Crafted NTFS metadata is parsed when remote clients read files on NFS- or SMB-exported NTFS mounts (ntfs_export_ops); nfsd/ksmbd VFS reads reach ntfs_mapping_pairs_decompress/ntfs_runlists_merge and the vulnerable ntfs_rl_realloc path without local shell access.\nAC:L - An attacker can deterministically craft NTFS mapping pairs or runlist merge sizes to force int overflow in realloc byte calculations; no races, rare configs, or victim-specific heap layout are required to trigger the undersized alloc and oversized memcpy.\nPR:N - Triggering the bug requires only access to mounted NTFS content (e.g., NFS/SMB read of an exported share or loop-mount in a user namespace with CAP_SYS_ADMIN), not real init-namespace root; no Linux superuser credentials are needed on the read/decompress code path.\nUI:N - Exploitation needs no victim interaction beyond the attacker or a remote client issuing normal filesystem reads/opens on crafted NTFS metadata; no mount dialog, USB insertion, or other user action by a separate victim is required.\nS:U - Impact is confined to kernel memory corruption and privilege escalation within the same kernel security domain; it does not cross VM, container, or IOMMU boundaries to affect a separate authority.\nC:H - Integer-overflowed memcpy copies far beyond the undersized kvzalloc/kvmalloc buffer, corrupting adjacent kernel heap objects and enabling arbitrary kernel memory disclosure when leveraged for exploitation.\nI:H - The heap buffer overflow provides a strong arbitrary kernel write primitive via adjacent-object corruption and heap grooming, sufficient for control-flow hijacking and local privilege escalation.\nA:H - Corrupting kernel heap metadata reliably causes kernel oops/panic or forced reboot; even failed exploitation attempts typically crash the host, and successful exploitation can hang or kill the system."
            }
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        }
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      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:48:49.705Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74570",
    "datePublished": "2026-08-15T12:28:10.107Z",
    "dateReserved": "2026-08-15T05:44:03.917Z",
    "dateUpdated": "2026-08-17T05:48:49.705Z",
    "state": "PUBLISHED"
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-17T14:56:13+00:00",
      "cve": "CVE-2026-74570",
      "id": "CVE-2026-74570",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ntfs: harden runlist realloc size calculations",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74570.json",
      "version": "3"
    }
  }
}



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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

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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.


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